APPLICATION SPECIFICATION

TPO Peel & Stick (HW) & (SA) Roof Systems

DESCRIPTION

Each job must be approved by American WeatherStar before the project begins to be eligible for a warranty.

PART 3 – INSTALLATION

3.01 SUBSTRATE CRITERIA

The building owner or owner's representative is responsible for providing and determining that the substrate is suitable to receive the WeatherStar TPO roofing system. The WeatherStar authorized contractor should not proceed until all defects have been corrected. If possible, begin roof installation at the high point of the roof, and work toward the lowest point.

3.02 SUBSTRATE PREPARATION

A. Typically, metal recover substrates are less than 22 gauge steel and require fastener pullout testing to be performed prior to submittal. The proper fastener assembly pattern is based on the pullout values achieved.

B. A positive slope is recommended to provide adequate drainage. Per NRCA guidelines, there should be no ponding water on the roofing system 48 hours after it has stopped raining.

C. Any existing sprayed-in-place urethane foam roofs must be removed prior to the installation of this roofing system.

D. Sweep the area of roof being covered to remove any loose dirt and debris.

E. Cut the filler nailer boards to fit snugly between the metal roof ribs, and build up using multiple layers to equal the metal roof rib height. Install one continuous nailer board over the installed layers of filler nailer boards. Secure the nailers through the metal roof panels and into the building framework, e.g. purlin, to achieve a minimum of 200 lb of pullout resistance per linear foot of nailer assembly.

3.03 INSULATION APPLICATION

A. Identify the area of roof being addressed in the workday, and lay out insulation with edges resting on the upper deck flute for metal decks or flat on supporting substrate for other types of decks.

B. Stagger all insulation joints the maximum amount possible and lay out with all joints tightly butted. Any gaps greater than 1/4" (6.35 mm) wide must be filled with matching insulation material.

C. When installing insulation thicker than 2 1/2" (63.50 mm), use multiple layers to maximize insulation thermal efficiency.

D. When using multiple layers of insulation on a project, install each subsequent layer with the long axis running perpendicular to the layer below it with all joints staggered and tightly butted.

E. Fit insulation tightly to roof penetrations, wood nailers, transitional walls, and parapets with any gaps greater than 1/4" (6.35 mm) filled with like material prior to membrane application.

3.04 INSULATION SECUREMENT

A. Mechanical Insulation Securement

Insulation attachment defined below is based on 300 lb pullout resistance or greater, for pullout values less than 300 lb per fastener, refer to the following table titled"Supplemental Securement Table".

NOTE: In the event the insulation is installed over an air barrier, the insulation securement must be in accordance with FM I-90 criteria for WeatherStar Fully Adhered Roof Systems.

· All insulation must be mechanically attached to the approved structural deck using fasteners of appropriate type and length and insulation plates installed at the rate of one fastener and plate per 2 square feet (16 fastener assemblies per 4' x 8' board) for 22 gauge steel decks and structural concrete (other decks require pull testing and may require additional securement). Fasten all insulation. When installing insulation greater than 1.5" in thickness a reduced fastening pattern may be applicable – contact American WeatherStar for more information.

Table 5 - Supplemental Securement Table for use on Projects with Fastener Pullout Values - Less Than 300 lbs. Pullout Resistance

Minimum Average Pullout Value per Fastener	Fastener & Plate Spacing
300 lbs. or greater	1 every 2 ft² (16 per bd.)*
250-299 lbs.	1 every 1.75 ft² (18 per bd.)
225-249 lbs.	1 every 1.50 ft² (21 per bd.)
175-224 lbs.	1 every 1.25 ft² (26 per bd.)
150-175 lbs.	1 every 1.0 ft² (32 per bd.)
*This value may be reduced by 50% when the top layer of insulation is a min. 2" or greater thickness single layer of ISO. (Not to exceed 2.5" in a single layer.) This table is NOT appropriate for Extended Wind Speed Warranties. Submit actual pullout test results to WeatherStar for evaluation. Provide a roof top drawing indicating the location and value of each test result. The number of pullout tests required are as follows: A. Less than 10,000 ft² (929m²) - 6 pullout tests B. 10,000 ft² (929m²) to 50,000 ft² (4645m²) - 10 pullout tests C. 50,000 ft² (4645m²) to 100,000 ft² (9290m²) - 20 pullout tests D. 100,000 ft² (9290m²) and over - 1 pullout test per 5,000 ft² (464.5m²) Pullout tests are required on any steel metal deck under 22 ga. thickness.

CAUTION: ALTERNATIVE METHODS TO SUCCESSFULLY SECURE INSULATION TO A ROOF DECK OR AN EXISTING ROOF SURFACE RELY HEAVILY ON PROPER CONDITION AND PREPARATION OF THE INTENDED SUBSTRATE.

B. Alternate Insulation Securement Method - Insulation Adhesive
(Low-Rise Insulation Adhesive and One Step Insulation Adhesive)

NOTE: Insulation adhesive is permitted only on applications where the acceptable roof deck has not been altered with coatings, sealants, or additives that may affect the bond between the acceptable substrate and insulation. Refer to the appropriate product data sheet (Low-Rise Insulation Adhesive or One Step Insulation Adhesive) to determine if the structural deck to which the insulation is being bonded is approved, or if special requirements apply. Both Low-Rise Insulation Adhesive and One Step Insulation Adhesive may also be used between layers of acceptable insulation.

1. Sweep and power-blow the substrate clean of any dust, dirt, and loose debris and make sure any moisture is allowed to dry prior to insulation application. Depending on the construction site, this step may have to be repeated periodically throughout the work day due to blowing dirt and debris. DO NOT APPLY INSULATION ADHESIVE OVER DIRT OR DEBRIS.

2. Using an insulation adhesive application cart, apply the Low Rise Insulation Adhesive to the substrate at the coverage rate of 500 to 600 ft² (46.45 to 55.74 m²) of installed insulation per 3 gal (11.36 L) pail of adhesive. The insulation should be laid in a fresh bead of adhesive before the bead(s) begins to skin. Refer to the Low Rise Insulation Adhesive Product Data Sheet for additional information.

3. Any unused insulation adhesive may be poured from the applicator cart back into an adhesive can and tightly resealed for later use.

One Step Insulation Adhesive (chemical curing)

4. Using one of the four One Step Insulation Adhesive Applicator models, apply the One Step Insulation Adhesive to the substrate at the coverage rate of 200 to 600 ft² of coverage per 4 pk ctn of 1.58 qt cartridges. Coverage rate will depend on spacing of insulation adhesive beads – contact WeatherStar for additional information. The insulation should be laid in a fresh bead of adhesive before the bead(s) begins to skin.

5. Any unused insulation adhesive may be used at a later time by simply replacing the cartridge mixing applicator nozzle.

6. Using 4' x 4' maximum insulation boards, lay out insulation with all joints tightly butted and any gaps greater than 1/4" filled with like material. Stagger joints between rows and layers the maximum amount possible to enhance thermal efficiency.

7. Once the boards are laid into the freshly applied insulation adhesive, apply pressure by walking on the boards or by placing a sufficient weight on the board to be certain of adequate contact between the insulation and the adhesive.

8. Repeat the process as applicable to apply subsequent layers of insulation. Priming is not required between layers of approved insulation.

C. Alternate Insulation Attachment Method III (Asphalt Attachment)

Roofing asphalt is neither supplied nor specified by WeatherStar, and the performance of asphalt used to attach roof insulation is not included in the WeatherStar warranty coverage. In the event the project designer selects this method of attachment, the following requirements must be met:

1. The proposed insulation shall be compatible with the roof substrate, the proposed type of asphalt, and the requirements of the WeatherStar Fully Adhered System.

2. Steep asphalt ASTM D 312 Type III or IV shall be utilized.

3. Insulation shall not be attached with asphalt directly to a steel deck.

4. Expanded or extruded polystyrene insulation shall not be attached with asphalt.

5. Maximum board size allowed is 4' x 4'.

6. If the insulation assembly consists of the first layer being mechanically fastened and the second layer being hot asphalt attached, the fastening rate of the first layer shall be per WeatherStar requirements for the particular insulation.

NOTE: The above requirements are not inclusive. Additional requirements in accordance with current industry standards are necessary. The WeatherStar roofing system warranty does not cover the attachment of the insulation when it is secured with hot asphalt.

3.05 PRIMER APPLICATION REQUIREMENTS

When the ambient temperature is 50° F (10 °C) or below during application ALL approved substrates must be primed with Clear Primer roller applied to the substrate with a medium nap roller at the application rate of 200 square feet per gallon and allowed to dry.

For ambient temperatures above 50° F (10° C), Clear Primer is NOT required on approved isocyanurate insulations.

All other approved insulations, masonry, concrete, and other irregular or porous surfaced substrates require priming with Clear Primer roller applied to the substrate with a medium nap roller at the application rate of 200 square feet per gallon and allowed to dry.

NOTE: Some porous surfaces may require a second primer application to achieve a suitable bonding substrate. The installing contractor should identify the most adverse area of substrate and perform a bonding test to determine if a single primer coat is sufficient to seal the surface for the Peel & Stick TPO membrane application.

3.06 MEMBRANE APPLICATION, SECUREMENT, & SEAMING

A. Membrane

1. Sweep and air blow the roofing substrate to remove any loose dirt and or debris.

2. To install the first membrane panel unroll the Peel & Stick TPO membrane, position over the substrate and allow the membrane to relax for 30 minutes.

3. Position the membrane over any adjacent Peel & Stick panels to achieve minimum 4" wide side laps and 6" wide ends laps.

4. Fold the first half of the membrane with the seam layout marks back onto itself without creasing, and expose the release liner while maintaining alignment over the adjacent panel.

5. Remove the release liner by pulling at a 45 degree angle, exposing the pre-applied adhesive.

6. Roll or mate the membrane into the substrate starting in the middle of the panel working out to both edges to minimize wrinkling of the panel.

7. Repeat steps 5 & 6 on the second half of the membrane. Make sure that the release liner remains in-place over the seam area during this step when installing Peel & Stick TPO (SA) product.

8. Using a stiff bristle broom and positive downward pressure, broom in the installed Peel & Stick membrane. Brooming direction should be across the short axis of the sheet to avoid creating wrinkles in the sheet.

9. After the Peel & Stick TPO membrane is bonded to the substrate using broom pressure to mate the surfaces together, roll the installed Peel & Stick TPO membrane panel with a weighted roller (linoleum roller or similar device that achieves 5 lb per linear inch of pressure). Roll the membrane across the short axis of the panel to bond the membrane to the substrate while carefully avoiding wrinkles in the panel.

10. For subsequent panels, unroll the membrane and allow to relax at least thirty (30) minutes. Position the top membrane to overlap the bottom membrane 4" using the preprinted layout lines. End laps are to be at lease 6" wide. Following good roofing practice, make sure the lap is shingled in the direction of the flow of water.

11. Repeat steps 4 through 9.

12. If the seam area has become contaminated with dirt or debris, etc., use a clean rag with WeatherStar cleaner to clean the exposed membrane in the seaming area and at least 2" beyond on both sheets for Peel & Stick TPO (HW) product or just the bottom sheet for Peel & Stick TPO (SA) product. Change rags frequently to avoid depositing previously removed materials. Allow cleaner to dry completely.

B. Seaming For Peel & Stick TPO (HW) ONLY (Hot Air Welding Method)

1. Using an approved automatic heat welding machine or hand held heat gun and 2" wide silicone or rubber roller, continuously weld a minimum 1 1/2" wide seam. WeatherStar recommends that only approved automatic walker welders be used to weld all field seams. See hot air welder specifications in the welding guide in your WeatherStar binder.

2. Seam inspection and scrim sealing.

a. All welded seams must be checked manually for voids or seal deficiencies by probing the entire seam area with a dull cotter key extractor after the seam has cooled. In addition, there must be destructive testing performed at the beginning of each workday and every time there is an interruption in the welding process, i.e. power failure, welder shut down, change in job site conditions, or after lunch.

b. Any identified deficiencies must be repaired daily to prevent moisture infiltration.

c. Apply TPO edge sealant to all membrane edges with exposed scrim at the rate of 115 linear feet per bottle.

C. Seaming For Peel & Stick TPO (HW) ONLY (TPO Seam Tape Method)

1. Assemble the Peel & Stick TPO (HW) membrane panel seam.

a. Stir clear primer thoroughly before and during application until no sediment or marbling appears in the pail. DO NOT THIN.

b. Assemble the Scrub Pad and Handle in preparation for use. Dip the pad into the primer, and allow the pad to saturate with primer. DO NOT ROLLER APPLY PRIMER.

c. FOLLOWING THESE INSTRUCTIONS WILL ALLOW THE MEMBRANE FLAP TO REMAIN RAISED EVEN AFTER YOUR HAND HAS PASSED THROUGH THE AREA THUS ALLOWING THE CLEAR PRIMER TO FLASH OFF. DO NOT FOLD THE MEMBRANE FLAP OVER ONTO ITSELF AND CREASE INTO PLACE. Open the lap area exposing the top of the adhered bottom panel of membrane and the release liner of the overlaying panel by inserting your hand and scrub pad applicator below the flap and applying Clear Primer to the entire seam area (Roller Application is not acceptable) using a back and forth scrubbing motion, apply the primer to the seaming surface to achieve a solidly primed surface without streaks or puddles at the application rate of 200 ft²/gal. Do not overwork the primer.

d. Allow the primer to dry to the touch of a clean dry finger.

e. Unroll seam tape along the line on the bottom membrane for the entire length of the seam.

NOTE: Do not remove the release paper from the seam tape at this time.

f. With the release paper still on the tape, hand roll the entire strip of seam tape, using a 2" wide silicone or rubber roller. Be certain there is good contact between the membrane and seam tape.

g. Allow the top membrane to fall freely onto the bottom membrane. Pull the release paper from the tape at a 45° degree angle away from the seam, and achieve initial contact by brushing your hand across the top membrane at a right angle.

h. Using a 2" wide silicone or rubber roller, hand roll the entire splice, first at a right angle toward the outer edge and then along the length of the splice. Make sure there is sufficient contact between the membrane and the seam tape.

2. Inspect seams, perform any necessary repairs and apply edge treatment.

a. Inspect all assembled seams daily and repair any fish-mouths or wrinkles in the seaming area by cutting out any raised membrane, laying the deck sheet flat and overlaying the repair area with product from the TPO Flashing Kit.

b. Once the seams have been inspected and any necessary corrections made, apply a high profile bead of White TPO Edge Caulk to the seam edge to complete the seaming operation.

i. If the seam area has become contaminated with dirt or debris, etc., use a clean rag saturated with WeatherStar cleaner to clean the seam step off area. Change rags frequently to avoid depositing previously removed materials.

ii. Apply a continuous "high profile" bead of WeatherStar White TPO Edge Caulk along all field seams, at field seam intersections, around T-Joint Covers (non hot-air welded only), and cover tape end laps at the application rate of 15 linear feet per tube.

D. Seaming for Peel & Stick TPO (SA) Only

NOTE: The Peel & Stick TPO (SA) panels are manufactured without selvage edges and cannot be assembles with WeatherStar Seam Tape or by hot air welding. For projects requiring a hot air weld or seam tape assembly, use Peel & Stick TPO (HW) membrane.

1. Prepare the Peel & Stick TPO (SA) membrane for seaming operations.

a. Stir WeatherStar clear primer thoroughly until no sediment or marbling appears in the pail. DO NOT THIN.

b. Assemble the Scrub Pad and Handle in preparation for use. Dip the pad into the primer, and allow the pad to saturate with primer. DO NOT ROLLER APPLY PRIMER.

c. FOLLOWING THESE INSTRUCTIONS WILL ALLOW THE MEMBRANE FLAP TO REMAIN RAISED EVEN AFTER YOUR HAND HAS PASSED THROUGH THE AREA THUS ALLOWING THE CLEAR PRIMER TO FLASH OFF. DO NOT FOLD THE MEMBRANE FLAP OVER ONTO ITSELF AND CREASE INTO PLACE. Open the lap area exposing the top of the adhered bottom panel of membrane and the release liner of the overlaying panel by inserting your hand and scrub pad applicator below the flap and applying Clear Primer to the entire seam area using a back and forth scrubbing motion, apply the primer to the seaming area to achieve a solidly primed surface without streaks or puddles at the application rate of 200 ft²/gal. Do not overwork the primer.

d. Allow the primer to dry to the touch of a clean dry finger.

e. Remove the release liner from the top membrane panel and mate the two surfaces together with a broom or by hand pressure avoiding wrinkles and fish mouths.

f. Hand roll the entire seam area with a 2" wide silicone or rubber roller in perpendicular direction across the narrow span of the seam area.

2. Inspect seams, perform any necessary repairs and apply edge treatment.

b. Once the seams have been inspected and any necessary corrections made, apply a high profile bead of White TPO Edge Caulk to the seam edge to complete the seaming operation.

E. Peel & Stick TPO (HW) & (SA) (All Seaming Methods)

1. In order to cover runs greater than 100' Peel & Stick sheets may be spliced together using an end lap. Overlap the sheet ends 6" (152 mm).

2. All TPO membrane edges with exposed reinforcement scrim must be sealed. For Peel & Stick TPO (SA) applications and Peel & Stick TPO (HW) seams assembled with 3" White Seam Tape, this sealing requirement is met with the specified TPO Edge Caulk application along field seams. Peel & Stick TPO (HW) seams with hot air welded seams and membrane edges with exposed scrim that are not otherwise addressed with edge caulk require an application of TPO edge sealant by the end of the workday in which the membrane with the raw edge is installed in the roofing system.

F. T-Joint Cover Application Instructions.

NOTE: special attention must be paid to areas where multiple layers (3 or more) of TPO field membrane come together forming t‑joints.

· For Peel & Stick TPO (HW) with Hot Air Welded Seams:

On 45 mil Membrane: If probing these areas reveals the presence of voids or cold welds, apply a T-Joint Cover or hot air weld a 4" round field cut piece of unsupported flashing to the formed T-joint.

On 60 mil or Greater Membrane: A T-Joint Cover or a 4" round field cut piece of unsupported flashing is REQUIRED at each T‑joint.

· For Peel & Stick TPO (HW) with 3" White Seam Tape Seams and Peel & Stick TPO (SA) Seams T-Joint Covers Are Required:

1. Peel & Stick TPO Flashing shall be cut into 8.5" circular patches and used as a T-Joint patch in areas where three (3) or more multiple layers of Peel & Stick TPO (SA) interests (T-Joints).

2. Clean the area where the 8.5" field cut T-Joint patch will be applied thoroughly with membrane cleaner. The area should be 12" square and have the intersection of the T-Joint at its center point.

3. Remove any visual signs of dirt or debris. Surface shall be free from any moisture, oil or other contaminants. Change cotton rags frequently to avoid depositing previously removed dirt or contaminants.

4. Stir clear primer thoroughly before and during application until no sediment or marbling appears in the pail. Do not thin.

5. Using a Scrub Pad and Handle, apply Clear Primer to the TPO membrane (T-Joint) using long and continuous back and forth strokes with heavy to moderate pressure along the bonding area until no streaks or puddling occurs. DO NOT ROLLER APPLY PRIMER.

6. Allow the Clear Primer to dry until slightly tacky to the dry finger touch.

7. Position the 8.5" circular T-joint Patch over the T-Joint intersection, centering the patch. Remove the release paper from the T-joint patch. By holding the T-joint Patch at the edges, and placing your thumb in the center of the patch, the patch can be positioned over the exact intersection of the T-Joint. Push down in the center of the patch adhering it to the membrane and then work outward in all directions to eliminate wrinkles.

8. Using a 2" wide silicone or rubber roller, hand roll along the step-downs of the seams to conform the patch into those small angle changes. Then, hand roll the entire patch to ensure continuous and proper adhesion to the membrane.

9. Apply a high profile bead of Edge Caulk around the entire T-joint patch.

10. Application of the Acrylic Coating to the surface of the TPO Peel & Stick Flashing can then be completed in order to match the surface of the membrane.

G. Peel & Stick TPO (SA) membrane seams and Peel & Stick TPO (HW) membrane seams assembled with 3" White Seam Tape require full edge treatment with TPO Edge Caulk applied to all completed seams at the end of each work day.

1. If the seam area has become contaminated with dirt or debris, etc., use a clean rag saturated with cleaner to clean the seam step off area. Change rags frequently to avoid depositing previously removed materials.

2. Apply a continuous "high profile" bead of White TPO Edge Caulk along all field seams, at field seam intersections, around T-Joint Covers (non hot-air welded only), and cover tape end laps at the application rate of 15 linear feet per tube.

3.07 PERIMETER AND BASE MEMBRANE SECUREMENT

A. Regardless of the method used to secure the field of the roofing membrane, some points on every roof require additional membrane securement. These areas include roof perimeters (parapets, transitional walls and edges), deck angle changes in excess of 2"/12" (including drain sump areas), at all curb type roofing penetrations, at pipe type penetrations greater than 12" in diameter, on both sides of expansion joints and other areas where the membrane must be anchored to prevent movement, stress or damage to the roofing membrane. Refer to the TPO standard details in this manual for securement requirements.

Perimeter Attachment

1. American WeatherStar offers several different types of attachment methods. Consult the appropriate WeatherStar standard detail.

2. Base attachment is required at each roof level, curb skylight, expansion joint and roof penetration over 12" in diameter or any angle change in slope or combined slopes that exceed 2" in 12" horizontal will require attachment.

B. Wood nailers provide a termination point for roofing insulation as well as a securement point for base flashing securement. Wood nailers are not covered by the WeatherStar warranty because they are a product by others and considered part of the building structure.

3.08 FLASHINGS

A. Perimeter flashing and flashing around vents, skylights and miscellaneous roof projections must be done with Pre-molded TPO Flashings to the greatest extent possible. Field fabricated detail flashings using unreinforced TPO flashing is acceptable only when a Pre-Molded Flashing is unfeasible; e.g. pipes without top access, etc. AWS offers numerous options for flashing. (See our standard details.)

1. Vertical Membrane Flashings (Parapets, Transitional Walls, Curbs, etc.)
Wall, parapet, and/or curb flashings may be completed using 18.75" Peel & Stick TPO Curb Flashing or standard TPO membrane equal in gauge (thickness) to the deck membrane.

For Peel & Stick TPO:

a. Stir WeatherStar bonding adhesive thoroughly. Achieve a uniform mix with no marbling and no sediment on the bottom of the pail. DO NOT THIN.

b. All vertical substrates require priming with WeatherStar Clear Primer roller applied to the substrate with a medium nap roller at the application rate of 200 ft²/gal and allowed to dry.

NOTE: Some porous surfaces may require a second primer application to achieve a suitable bonding substrate. The installing contractor should identify the most adverse area of vertical substrate and perform a bonding test to determine if a single primer coat is sufficient to seal the surface for the Peel & Stick TPO membrane application.

c. Once the Clear Primer has flashed off sealing the vertical substrate in preparation for flashing, position the Peel & Stick TPO membrane at the base of the vertical substrate with the seam area folded under to protect it from contamination.

d. Remove the release liner from the Peel & Stick TPO membrane and mate the membrane to the prepared substrate by rolling the membrane up the substrate without wrinkles or trapped air and extending over the top of the substrate in accordance with the requirements of the desired WeatherStar termination detail.

For Standard TPO:

NOTE: Requires intermediate attachment at 24" intervals.

a. Stir bonding adhesive thoroughly. Achieve a uniform mix with no marbling and no sediment on the bottom of the pail. DO NOT THIN.

b. Apply WeatherStar bonding adhesive to both the flashing material and the vertical substrate to which it is being bonded at a coverage rate of approximately 60 ft²/gal of adhesive.

c. Allow adhesive to flash-off until the surface of the adhesive-coated membrane flashing feels tacky but does not transfer to a clean dry finger or "slide" when a push test is performed.

d. Roll the prepared flashing membrane tightly into the angle change, avoiding both sharp creases and excessive bridging, and continue up the vertical substrate without wrinkles, creases or trapped air, while smoothing the flashing to the substrate with a sweeping motion of your hand to promote a positive bond.

NOTE: Allow flashing membrane to bridge slightly at the deck to vertical substrate junction equal to the amount that will still allow a rubber or silicone hand seam roller to make contact with both the vertical and horizontal membrane surfaces simultaneously.

For Both Types of TPO Membrane:

e. Once the flashing has been preliminarily bonded to the vertical substrate by hand, sweep the flashing material with a medium-stiff bristle broom to finish the bonding process.

f. Terminate top edge of flashing per American WeatherStar standard TPO details.

g. Complete all seams between the flashing membrane and the field membrane according to the applicable WeatherStar Peel & Stick TPO seaming procedure.

2. Flashing penetrations passing through the roofing membrane. Flash all pipes with TPO pre-molded pipe boots to the greatest extent possible. Field fabricate pipe flashings with TPO Non-Reinforced Flashing per standard American WeatherStar details when a pre-molded flashing is not feasible.

NOTE: All existing flashings MUST be removed before applying a new flashing.

B. Expansion Joints and Building Control Joints.

Consult American WeatherStar's standard details for various application methods.

C. Pitch Pans

Fill pitch pans in accordance with American WeatherStar's standard details.

D. Roof Drains

1. Consult American WeatherStar's standard details.

2. Prepare substrate around each roof drain to prevent membrane bridging or distortion and to provide a smooth transition from the roof surface to the drain clamping ring.

3. The surface between the clamping ring and the drain must be clean and smooth. Remove all existing flashing, cement or lead on retrofit projects down to bare clean metal.

4. Apply one (1) complete tube of Waterstop between drain bowl compression flange and the underside of the new membrane before compressing the new membrane to drain bowl assembly with the compression ring mounted on the top surface of the new membrane. The detail is only complete when the Waterstop is fully compressed between the new membrane and the flange of the drain bowl forming a solid seal between the two. Be careful to evenly compress the assembly to avoid cracking or breaking the drain compression ring. Cracked or broken drain compression rings may result in a reinspection of the finished roof system to ensure corrective measures have been made before WeatherStar will accept the roof system for warranty coverage.

5. All bolts and/or clamps must be in place in order to provide constant, even compression. Missing drain bolts may result in a reinspection of the finished roof system to ensure corrective measures have been made before American WeatherStar will accept the roof system for warranty coverage.

6. Do not run seams through roof drains or sumps. If a seam is run through a drain sump cut the membrane with the assembled seam outside of the drain compression ring area and install a target patch of new membrane extending a minimum of 3" outside of the sump area and seamed into the field membrane using standard seam tape seaming procedures. Apply T-joint patches as required at the target patch to seam intersections in accordance with WeatherStar standard T-joint application procedures.

E. Metal Work

1. No roof system is complete until all the edges are terminated in such a way as to prevent water infiltration into the roofed structure. This typically involves the use of manufactured or shop fabricated metal detailing such as coping caps, gravel stops, roof edging, flashing and counter-flashing components. All metalwork should be fabricated and installed according to SMACNA and National Roofing Contractors Association (NRCA) guidelines. Unless specifically agreed to in writing prior to installation, metalwork manufactured by others is not included in the WeatherStar warranty coverage.

a. Factory formed metal work, when used in a warranted roof assembly, is fully covered by the WeatherStar Full System Warranty when installed to WeatherStar specification.

b. Manufactured metalwork must be installed in accordance with the metalwork installation instructions available from the metalwork manufacturer.

c. Metalwork by roofing contractors must be fabricated and installed in accordance with SMACNA and NRCA recommendations. All flange-mounted metalwork must be flashed according to the appropriate WeatherStar detail.

d. TPO projects with gravel stop configuration metal work (formed dam capable of holding water) with an TPO Cover Tape flange strip in of metalwork must have edge caulk applied on the dam side of the cover tape to aid in sealing the seam against trapped water.

2. Any request for metal work by others inclusion into warranty coverage must accompany the Pre-Project Inspection Report via "Deviation Request" and include shop drawings of the metalwork that the request is based upon as well as a roof plan showing the installed location and linear dimension for each profile. To be considered for warranty coverage, the minimum requirements must be met: metalwork material is 24 gauge G-90 Kynar Pre-finished Steel or .040" Aluminum (mill finished, pre-finished or anodized); the proposed fabrication as shown on the submitted shop drawings complies with SMACNA and NRCA recommendations for the specific configuration submitted; installation securement is clearly defined on the shop drawings, e.g. fastener type and spacing, cleat type, etc.. Keep in mind that approval of metalwork for inclusion into warranty coverage is conditional and subject to the "terms, conditions and limitations" of the requested warranty if approved and may involve an additional fee (warranty up-charge per square foot).

F. Night Seal

1. Consult American WeatherStar's standard detail

2. At the completion of each day's work, a watertight seal must be established at any loose edge of membrane with an appropriate sealant. Care must be used to guarantee that no water flows beneath any completed sections of roof. Consult American WeatherStar's Standard Night Seal Detail for method of attachment. Membrane contaminated with the sealant used as a night seal must be cut out and discarded prior to resumption of work.

3.09 WALKWAYS

A. Consult American WeatherStar's standard details.

B. Walkways are required at all access points to the roof system and recommended anywhere routine (routine is defined as once a month or more) traffic on the membrane surface is anticipated. Walk pads are used to protect the weatherproofing membrane from damage or excessive wear and tear. Traffic related roof damage is not covered by the WeatherStar warranty. In areas of extreme traffic contact WeatherStar for options to enhance the roof system in order to prevent or mitigate insulation damage related to traffic. Walkway maintenance is the responsibility of the building owner as walk pads are not part of the warranted waterproofing assembly.

C. Should access to the roofing membrane be required in order to perform warranty service to the roof system only WeatherStar approved walk pads will be moved and replaced as necessary to perform service at WeatherStar's expense. Pavers, walkway systems, patio surface components and other products neither manufactured nor supplied by American WeatherStar that impede roof system service must be removed and replaced at the building owner's expense. Should the obstacle removal and replacement be performed by the WeatherStar contractor servicing the leak call under building owner authorization and or purchase order, WeatherStar assumes no responsibility or liability for the performance of the contractor in performing that service.

3.10 FINISHED ROOF PROTECTION

When it becomes necessary for other trades to work over a completed area of new roof, the roofing membrane and flashing must be protected from physical damage. Proper and adequate protection includes installing a slip-sheet in the work area overlaid with plywood or OSB Board in order to dissipate the effects of traffic on the finished roof surface and to prevent impact damage to the system caused by dropped tools and or equipment. If damage does occur to the roof system it must be immediately repaired in order to preserve the integrity of the roof insulation. If membrane is damaged in more than 6 locations within a 100 square foot area (10' x 10') new membrane extending 6" beyond the border of the damaged areas must be installed over existing membrane in accordance with WeatherStar Specifications. For fully adhered and mechanically attached applications, the membrane must be fully bonded with the existing underlying membrane with a WeatherStar approved adhesive.

Table 6 - Insulation Attachment Rates For Fully Adhered Systems

Part 1 - General
Part 2 - Products
Part 3 - Installation
Details

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