Base and Ply Sheets

HPR® SA FR Base Sheet

Security in Multi-Ply Construction
Superior Strength
Advanced Adhesive Technology

HPR SA FR Base Sheet is an SBS (Styrene-Butadiene-Styrene), fiberglass reinforced, self-adhering, modified bitumen underlayment for the StressPly® SA FR Mineral roofing systems. The top surface of the base sheet has an adhesion-promoting polyolefin film. The bottom has an adhesive backing with a peel-off release film.

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Product Specifications

Method	Description
Self-Adhered	To the approved roof board that has been primed with SA PrimerTM, install one (1) or two (2) plies of HPR SA FR Base Sheet shingled uniformly. For a two-ply system, use a 19” (48.26 cm) starter strip followed by a full 39” (99.06 cm) wide sheet. Starting at the low point of the roof, unroll self-adhering base sheets in the desired position. Fold the membrane lengthwise back onto itself, remove the split back release film from the exposed side and gradually push the membrane into place. Apply even pressure along the entire length of the membrane from the center to outer edges to avoid air pockets or wrinkles. Repeat for the other side. Firmly apply pressure with a suitable weighted roller to ensure 100% adhesion. The base sheets are installed in shingle fashion throughout the prepared substrate. Application of nailable substrate Beginning at the low point of the roof, install one ply of HPR SA FR Base Sheet with the white release film facing upwards. Start with an appropriate roll width (1/3 or 1/2 roll width) to accommodate offsetting of side laps of subsequent layers of HPR SA FR Base Sheet and/or StressPly SA FR Mineral cap sheet. Install so that no side laps are against the flow of water. Fasten HPR SA FR Base Sheet with a minimum fastening pattern of every 9” o.c. on side laps and every 18” o.c. in two staggered rows in the field of the sheet. Overlap base sheet side laps 4” and end laps 8”. Offset end laps a minimum of 3 feet. Prior to installing additional plies HPR SA FR Base Sheet remove the white release film. Additional plies HPR SA FR Base Sheet are to be installed as specified in the section above. HPR SA FR Base Sheet rolls are individually boxed. Store rolls in these closed containers until ready for installation. Apply when the ambient air temperature, roll temperature and substrate temperature are all 50°F (10°C) or above. Application in cool temperatures will negatively affect adhesion. NOTE: Do not leave installed base exposed; cover in the same day with HPR SA FR Base Sheet and/or StressPly SA FR Mineral cap sheet. NOTE: Sweep or blow away any dust, dirt or sand particles that could interfere with adhesion between each layer step. See StressPly® SA System Application Guide for full list of approved roof boards and detailed instructions.

Method

Description

Self-Adhered

To the approved roof board that has been primed with SA PrimerTM, install one (1) or two (2) plies of HPR SA FR Base Sheet shingled uniformly. For a two-ply system, use a 19” (48.26 cm) starter strip followed by a full 39” (99.06 cm) wide sheet. Starting at the low point of the roof, unroll self-adhering base sheets in the desired position. Fold the membrane lengthwise back onto itself, remove the split back release film from the exposed side and gradually push the membrane into place. Apply even pressure along the entire length of the membrane from the center to outer edges to avoid air pockets or wrinkles. Repeat for the other side. Firmly apply pressure with a suitable weighted roller to ensure 100% adhesion. The base sheets are installed in shingle fashion throughout the prepared substrate. Application of nailable substrate Beginning at the low point of the roof, install one ply of HPR SA FR Base Sheet with the white release film facing upwards. Start with an appropriate roll width (1/3 or 1/2 roll width) to accommodate offsetting of side laps of subsequent layers of HPR SA FR Base Sheet and/or StressPly SA FR Mineral cap sheet. Install so that no side laps are against the flow of water. Fasten HPR SA FR Base Sheet with a minimum fastening pattern of every 9” o.c. on side laps and every 18” o.c. in two staggered rows in the field of the sheet. Overlap base sheet side laps 4” and end laps 8”. Offset end laps a minimum of 3 feet. Prior to installing additional plies HPR SA FR Base Sheet remove the white release film. Additional plies HPR SA FR Base Sheet are to be installed as specified in the section above. HPR SA FR Base Sheet rolls are individually boxed. Store rolls in these closed containers until ready for installation. Apply when the ambient air temperature, roll temperature and substrate temperature are all 50°F (10°C) or above. Application in cool temperatures will negatively affect adhesion. NOTE: Do not leave installed base exposed; cover in the same day with HPR SA FR Base Sheet and/or StressPly SA FR Mineral cap sheet. NOTE: Sweep or blow away any dust, dirt or sand particles that could interfere with adhesion between each layer step. See StressPly® SA System Application Guide for full list of approved roof boards and detailed instructions.

Physical Property	Value
Tensile Strength	MD 60 lbf./in. (10.5 kN/m) XD 39 lbf./in. (6.8 kN/m)
Tear Strength	MD 100 lbf. (445 N) XD 95 lbf. (422.7 N)
Low-Temp Flex	-10°F (-23°C

Type	Link
Data Sheets	HPR SA FR Base Sheet Technical Data Sheet
SDS	4 Polyethylene Rolled Goods Safety Data Sheet
SDS	Rolled Goods Safety Data Sheet

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Security in Multi-Ply Construction

Superior Strength

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Related Products

StressPly® SA FR Mineral

SA Primer

KEE-Lock™ Mastic

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