Garland SBS Membrane Installation Guidelines

Notice to the Reader: The instructions provided below are reprinted from the manufacturer's own materials which were submitted to the RoofStar Guarantee Program for inclusion in this Manual. The reader is urged to check these against current publications issued by the manufacturer, to ensure accuracy.

Manufacturer: Garland Canada Inc.

Contact Address: See the current Membership list and contact information at www.rcabc.org

Product Group: SBS MODIFIED BITUMINOUS MEMBRANE

Country of Origin: Canada

Country of Manufacture: Canada, USA, United Kingdom

Year First Installed

B.C.: 1990

Canada: 1987

Foreign: 1974

1 Description

The Garland Company is a leading manufacturer and distributor of high-performance roofing and flooring solutions for commercial, industrial, and public properties. We offer our industry’s most comprehensive customer support services, including a unique Roof Asset Management Program (RAMP®). Our innovative products and facility management solutions have been extending the life cycle of buildings like yours for over a century.

1.1 GENERAL

The roofing assembly / material information published by the RGC Roofing Practices Manual does NOT represent a complete set of the manufacturer's published data, nor does it represent a detailed specification. The preparation of a detailed specification is the responsibility of the design authority.

1.1 SYSTEM DESCRIPTION

.1 Two-ply roof membranes: the first ply consists of a base sheet; applied with hot asphalt, cold adhesive fully heat welded, with adhesives and heat welded seams, self-adhered with self-stick products; the second ply consists of a cap sheet applied with hot asphalt, cold adhesive or heat welding.

1.2 PROJECT CONDITIONS

.1 Do not apply roofing insulation or membrane to damp deck surface.

.2 Do not expose materials subject to water or solar damage in quantities greater than can be weatherproofed during same day.

.3 All slopes greater than 2:12 (17%) require back-nailing to prevent slippage of the ply sheets. Use ring or spiral-shank one (1) inch (25 mm) cap nails, or screws and plates at a rate of one (1) fastener per ply (including the membrane) at each insulation stop. Place insulation stops as per RGC Guarantee Standards (Section 2.1.1) On non-insulated systems, nail each ply directly into the deck at the rate specified above. When slope exceeds 2:12 (17%), install all plies parallel to the slope (strapping) to facilitate backnailing. Install four (4) additional fasteners at the upper edge of the membrane when strapping the plies.

1.3 MANUFACTURER’S SERVICES

.1 Applicator training: Garland membranes are applied by GARLAND APPROVED RCABC MEMBER APPLICATOR ONLY.

.2 Technical service: technical representatives are available for consultation and field training; owners, architects, and engineers are assisted in the selection and proper use of Garland materials by technical representatives.

.3 Specification / Drawings: complete specifications and detail drawings are available upon request.

1.2 MATERIALS

1.3 EXECUTION

3.1 PREPARATION

.1 Ensure membrane substrate is rigid, dry, smooth, compatible, free of fins and sharp edges, and clean of all

.2 Ensure all openings, walls, and projections through the roof are firmly affixed and cant strips, reglets and nailing strips are in place.

.3 A thermal barrier may be required between the roof deck and some insulations. Building code and insurance requirements to be identified by design authority.

3.2 PRIMER

.1 Prime wood, concrete, and metal surfaces to be directly adhered with bituminous membranes; allow to dry.

3.3 APPLICATION INSTRUCTION FOR A TWO SYSTEM

.1 BASE SHEET INSTALATION (TWO PLY SYSTEM) HOT OR COLD

A) Base sheet: Install one (1) SBS base sheet in twenty five (25) lbs (11.3kg) per square of bitumen of cold adhesives shingled uniformly over the entire prepared substrate. Shingle in direction of slope of roof to shed water on each area of roof. Do not step on rolls until asphalt has cooled, fish mouths should be cut and patched.

B) Lap ply sheet ends eight (8) inches (203mm).

C) Lightly broom in base plies to assure complete adhesion.

D) Extend plies two (2) inches (50mm) beyond top edges of cants at wall and roof projections and equipment bases.

E) Install base flashing ply to all perimeter and projection details after membrane application.

.2 MODIFIED MEMBRANE INSTALATION HOT OR COLD

A) Solidly bond the modified membrane to the base layers with specified asphalt or cold adhesives at the rate of twenty five (25) to thirty (30) lbs. (11-13kg) per 100 square feet.

B) The modified membrane roll must push a puddle of asphalt in front of it with asphalt or cold adhesives slightly visible at all side laps. Exercise care during application to eliminate air entrapment under the membrane.

C) Apply pressure to all seams to ensure that the laps are solidly bonded to substrate.

D) Install subsequent rolls of modified membrane across the roof as above with a minimum of four (4) inch (101mm) side laps and eight (8) inch (203mm) end laps. Stagger the end laps. Apply the modified membrane in the same direction as the previous layers but stagger the laps so they do not coincide with the laps of the base layers.

E) Apply asphalt or cold adhesives no more than five (5) feet (1.5m) ahead of each roll being embedded.

.4 FLASHING MEMBRANE INSTALATION

A) Seal all curb, wall and parapet flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

B) Prepare all walls, penetrations, expansion joints [and where shown on the drawings] to be flashed with asphalt primer at the rate of one hundred (100) square feet per gallon (2.1square m per litre). Allow primer to dry tack free.

C) Use the modified membrane as the flashing membrane. Adhere to the underlying base flashing ply with specified asphalt unless otherwise noted in these specifications. Nail off at a minimum of eight (8) inches (203mm) o.c. from the finished roof at all vertical surfaces.

D) Solidly adhere the entire sheet of flashing membrane to the substrate.

E) Seal all vertical laps of flashing membrane with a three-course application of trowel-grade mastic and fiberglass mesh.

F) Coordinate counter flashing, cap flashings, expansion joints, and similar work with modified bitumen roofing work.

G) Coordinate roof accessories, miscellaneous sheet metal accessory items, including piping vents and other devices with the roofing system work.

3.4 APPLICATION INSTRUCTION FOR A TWO PLY SYSTEM – HOT WELDED

.1 BASE SHEET INSTALATION (TWO OR THREE PLY SYSTEM)

A) Install one layer of SBS Torch Base Sheet to a properly prepared substrate. Shingle in proper direction to shed water on each area of roofing.

B) To a suitable substrate, lay out the roll in the course to be followed and unroll six (6) feet (1.8m).

C) Using a roofing torch, heat the surface of the coiled portion until the burn-off backer melts away. At this point, the material is hot enough to lay into the substrate. Progressively unroll the sheet while heating and press down with your foot to insure a proper bond.

D) After the major portion of the roll is bonded, re-roll the first six (6) feet (1.8m) and bond it in a similar fashion.

E) Repeat this operation with subsequent rolls with side laps of four (4) inches (101mm) and end laps of eight inches.

F) Give each lap a finishing touch by passing the torch along the joint and spreading the melted bitumen evenly with a rounded trowel to insure a smooth, tight seal.

G) Extend underlayment two (2) inches (50mm) beyond top edges of cants at wall and projection bases.

H) Install base flashing ply to all perimeter and projections details.

.2 MODIFIED MEMBRANE APPLICATION

A) Install HPR torch-on membrane as described below.

B) Over the SBS Torch Base Sheet underlayment(s), lay out the roll in the course to be followed and unroll six (6) feet (1.8m). Seams for the top layer of modified membrane will be staggered over the SBS Torch Base Sheet seams.

C) Using a roofing torch, heat the surface of the coiled portion until the burn-off backer melts away. At this point, the material is hot enough to lay into the substrate. Progressively unroll the sheet while heating and press down with your foot to insure a proper bond.

D) After the major portion of the roll is bonded, re-roll the first six (6) feet (1.8m) and bond it in a similar fashion.

E) Repeat this operation with subsequent rolls with side laps of four (4) inches (101mm) and end laps of eight (8) inches (203mm).

F) Give each lap a finishing touch by passing the torch along the joint and spreading the melted bitumen evenly with a rounded trowel to insure a smooth, tight seal.

.3 FLASHING MEMBRANE INSTALATION

A) Seal all curb, wall and parapet flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

B) Prepare all walls, penetrations, expansion joints [, and where shown on the drawings] to be flashed with asphalt primer at the rate of one hundred (100) square feet per gallon (2.1 square m per litre). Allow primer to dry tack free.

C) Use the modified membrane as the flashing membrane. Adhere to the underlying base flashing ply with specified asphalt unless otherwise noted in these specifications. Nail off at a minimum of eight (8) inches (203mm) o.c. from the finished roof at all vertical surfaces.

D) Solidly adhere the entire sheet of flashing membrane to the substrate. Tops of all flashings that are not run up and over curb shall be secured through termination bar 6 inches (152mm) and sealed at top

E) Seal all vertical laps of flashing membrane with a three-course application of trowel-grade mastic and fiberglass mesh.

F) Coordinate counter flashing, cap flashings, expansion joints, and similar work with modified bitumen roofing work.

G) Coordinate roof accessories, miscellaneous sheet metal accessory items, including piping vents and other devices with the roofing system work [as specified in other sections].

3.5 APPLICATION INSTRUCTION FOR SELF ADHERING SYSTEM

.1 BASE PLY INSTALATION (TWO OR THREE PLY SYSTEM)

A) Fiberglass Plies: Install one (1) ply HPR SA Base Sheets shingled uniformly over the entire prepared substrate. Shingle in direction of slope of roof to shed water on each area of roof.

B) Fiberglass Plies: Install two (2) plies HPR SA Base Sheets shingled uniformly to achieve two plies over the entire prepared substrate. Shingle in direction of slope of roof to shed water on each area of roof.

C) Lap ply sheet ends eight (8) inches (203mm). Stagger end laps twelve (12) inches (305mm) minimum.

D) Extend plies two (2) inches (51mm) beyond top edges of cants at wall and roof projections and equipment bases.

E) Install base flashing ply to all perimeter and projection details.

.2 MODIFIED MEMBRANE INSTALATION

A) The modified membrane shall then by solidly adhered to the base layers.

B) Starting at the low point, unroll the StressPly SA FR Mineral in the desired position. Fold the membrane 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 center to outer edges to avoid air pockets or wrinkles. Care should be taken to eliminate air entrapment under the membrane.

C) Repeat for the other side. After the rolls are in place, apply uniform pressure to the entire roll area using a long handle weighted roller.

D) Install subsequent rolls of modified membrane across the roof as above with a minimum of four (4) inch (102 mm) side laps and eight (8) inch (203 mm) end laps. Stagger the end laps. Apply the modified membrane in the same direction as the previous layers but stagger the laps so they do not coincide with the laps of the base layers.

E) Where a lap is to be made to the granular surface, vigorously brush loose granules from the surface to be mated and carefully apply Flashing Bond to the granular surface. And allow 5-10 minutes to flash. Join the two surfaces and using a small metal roller or other suitable roller, firmly press into place. Roll edges firmly to ensure positive adhesion.

.3 FLASHING MEMBRANE APPLICATION

A) Seal all curb, wall and parapet flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

B) Specifier Note: Verify that drawings contain applicable details. Otherwise delete the text in brackets indicated in the following paragraph.

C) Prepare all walls, penetrations, expansion joints [and where shown on the drawings] to be flashed with asphalt primer at the rate of one hundred (100) square feet per gallon (2.1 square meter per litre). Allow primer to dry tack free.

D) Use the modified membrane as the flashing membrane and will be adhered to an underlying base flashing. Nail off at a minimum of eight (8) inches (203 mm) o.c. from the finished roof at all vertical surfaces.

E) Solidly adhere the entire sheet of flashing membrane to the substrate. Tops of all flashings that are not run up and over curb shall be secured through termination bar 6" and sealed at top.

F) Seal all vertical laps of flashing membrane with a three-course application of trowel-grade mastic and fiberglass mesh.

G) Specifier Note: Delete the text within brackets in the following two paragraphs if no other applicable roofing sections are included in the Project Manual.

H) Coordinate counter flashing, cap flashings, expansion joints, and similar work with modified bitumen roofing work.

I) Coordinate roof accessories, miscellaneous sheet metal accessory items, including piping vents and other devices with the roofing system work [as specified in other sections]. When using mineralized cap sheet, all stripping shall be installed prior to cap sheet installation.

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