Hal Industries SBS Membrane Installation Guidelines

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Hal Industries SBS Membrane Installation Guidelines

Revision as of 19:07, 7 November 2016 by James Klassen (talk | contribs) (→‎EXECUTION)
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: Hal Industries Inc.

Contact Address: See Membership List in Section 1.

Product Group: SBS MODIFIED BITUMINOUS MEMBRANES

Country of Origin: Canada (B.C.) Country of Manufacture: Canada (B.C.)

Year First Installed
1990

1 Description

Hal Industries Inc. has been manufacturing asphalt roofing products for the flat roofing industry since 1974.

Asphalt available from B.C. refineries has been shown to have excellent compatibility with SBS polymers. Hal Industries Inc. uses a high-shear mixing process to blend raw asphalt with linear and branched SBS polymers. Limestone filler is then added as a thickener and conditioner and other minor ingredients are added as performance enhancers. This blend is used to saturate and coat non-woven polyester or fibreglass mat to produce a very flexible, high-quality membrane.

Cap sheets are surfaced with either mineral granules or aluminum foil on the top side and either sand or thermofusible polypropylene film on the underside. Base sheets are surfaced with sand or thermofusible polypropylene film, or a combination of these. Membranes may be installed either by the torch method or by embedment in hot asphalt.

Product designations are as follows:

  1. Therm-a-ply P180 series (Polyester-reinforced, moppable, torchable)
  2. Therm-a-ply G100 series (Fibreglass-reinforced, moppable, torchable)
  3. Alumatac P180 or Alumatac G100 (Aluminum foil-surfaced, moppable, torchable)
  4. Polymax 180 GS (Mineral-surfaced cap sheet, moppable)

1.1 GENERAL

The roofing assembly / material information published in the RCABC 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.

RANGE OF APPLICATION

  1. For use over roof decks in commercial, institutional, industrial, and residential construction, where built- up roofing has historically been specified.
  2. As a loose-laid roofing membrane under ballast (gravel or pavers) in a protected membrane system.
  3. As a fully-adhered or mechanically-fastened roofing membrane, without ballast, on flat, curved, or low-sloped roofs.
  4. As a roofing membrane over existing roofs in recover or replacement applications.
  5. As a waterproofing membrane over parking garages or foundations.


DELIVERY, STORAGE, AND HANDLING

  1. Keep all materials dry during storage and application. Avoid storing in direct sunlight. Always store and ship rolls in a vertical position. Avoid damage during handling.
  2. If ambient temperature is 5°C (41°F) or lower, store rolls in a heated enclosure for at least 24 hours prior to use.


SITE CONDITIONS

  1. Membrane installed on slopes from dead flat to 1:12 (1" in 12") may be applied with or without mechanical fastening. Membrane installed on slopes exceeding 1:12 (1" in 12") must be mechanically-fastened to the deck surface.
  2. Mopping of membranes to a deck slope which exceeds 1:12 (1" in 12") is generally not recommended. Contact manufacturer for advice.


STANDARDS

  1. Independently sampled and tested by Warnock Hersey Labs to CGSB 37-GP-56M.
  2. Class C fire rated. Contact manufacturer for updated information.


MANUFACTURER'S SERVICES

  1. Factory representative is available at all times for applicator training assistance.
  2. Specification writing assistance is available.
  3. Plant visits are available to B.C. applicators or specifiers for educational purposes.

1.2 MATERIALS

1.3 EXECUTION

PREPARATION

  1. Site conditions must be suitable for membrane application (see above).
  2. Deck must be clean, dry, and securely fastened.
  3. Cants must be installed at all abrupt rises in deck elevation such as curbs, parapet walls, and roof edges.
  4. Ensure that roofing materials are dry and undamaged.
  5. Suitable flame-resistant substrates must be installed prior to application of any torch-applied membrane.
  6. Fire extinguishers and other safety equipment must be on the roof prior to commencement of the job.


PRIMER

  1. Apply asphalt primer where specified by the design authority or where the roof is being applied directly to wood, concrete, or metal surface. Asphalt primer shall conform to CGSB-37-GP-9-Ma-1983.


VAPOUR RETARDER

  1. If a vapour retarder is specified as part of the roofing system, it shall be one of the following:
    • Scrim Kraft vapour retarder produced by Hal Industries Inc.
    • No.15 organic roofing felt plus asphalt.
    • Other approved vapour retarder.
  2. Vapour retarder shall be installed as specified by the design authority.


INSULATION

  1. Nailable Decks: mechanically fasten insulation as per manufacturer's recommended method and to RoofStar Guarantee Standards.
  2. Non-Nailable Decks: embed insulation in a mopping of hot asphalt or attach by other approved methods according to RoofStar Guarantee Standards.
  3. On slopes exceeding 1:12 (1" in 12"), install nailing strips at 600 mm (24") centres according to RoofStar Guarantee Standards.
  4. Install accepted insulation overlay board, where required, according to RoofStar Guarantee Standards.
  5. Perma-board is an accepted insulation overlay for one and two layer applications where applicable.
  6. Where a torch-applied roofing system is to be installed over Perma-board and the surface beneath the Perma-board is flame sensitive, then cover all joints in Perma-board with tape or alternately place 150 mm (6") wide Type IV fibreglass strips beneath joints, prior to torch-applying a membrane. Tape is to be HAL’s torch-applied Therma-tape.
  7. Where tape is used to flame-proof the joints in Perma-board, use the following steps:
    • Pre-torch all edges of each Perma-board sheet before installing to remove polyfilm surface layer.
    • Cut tape into convenient lengths then pre-torch one side and place quickly over joint, then press or roll to adhere. Overlap end joints 50 mm (2").
  8. Fasten Perma-board overlay using nine fasteners per board, as shown, or alternatively adhere Perma-board with hot asphalt, according to RoofStar Guarantee Standards, ensuring that sanded-side be placed down against the asphalt.
2 m (80")
• • •
• • •
• • • 
1 m (40")


BASE SHEET APPLICATION

  1. On slopes up to 1:12 (1" in 12"), install base sheet at right angles to slope, beginning at low point of roof.
  2. On slopes exceeding 1:12 (1" in 12"), install base sheet parallel to slope, and nail upper edge at 200 mm (8") o/c with minimum 25 mm (1") headed roofing nails.
  3. Unroll and align membrane, lap sides 75 mm (3") and ends 150 mm (6"). Always keep several rolls laid out on the roof deck ahead of the installation to permit relaxation and acclimatization to take place.
  4. Install each aligned sheet by re-rolling approximately halfway and adhering each half alternately.
  5. Asphalt-adhered sheet (sanded side down) (Use Type 3 or Type 4 asphalt only):
    • Apply hot asphalt to the roof deck surface at its equiviscous temperature [minimum 205°C (400°F)] at a rate of 1.2 kg / m² (25 lb / 100 sq ft).Maintain a puddle just ahead of the advancing roll at all times, allowing a positive bleed-out to occur at each edge of the sheet.Never mop more than one metre ahead of roll.
    • Press the membrane into the hot asphalt.
    • Slit any fishmouths and press in while asphalt is still hot.Apply a patch to cover any slits by embedding the patch into hot asphalt.
    • Use a roofer's torch to melt polyfilm and prepare a selvedge under each end lap.
  6. Torch-adhered sheet (polyfilm-surfaced side down):
    • Using a trigger-handled roofer's torch, heat the roll surface evenly until the polyfilm surfacing melts and a slight flow of coating occurs.Apply heat to selvedge edge of previous sheet while at the same time advancing the roll with a hooked bar.A slight bead of coating should squeeze out at the lap.


CAP SHEET APPLICATION

  1. Install cap sheet in the same direction as the base sheet, starting at low point and staggering all laps.Offset the side laps from base sheet side laps by a minimum of 300 mm (12") and end laps by a minimum of 1 m (39"). Overlap at sides must be no less than 75 mm (3"), and at ends no less than 150 mm (6").
  2. Keep several rolls laid out on the roof deck ahead of the installation to permit relaxation and acclimatization to take place.
  3. Install each aligned sheet by re-rolling approximately halfway and adhering each half alternately.
  4. Asphalt-adhered sheet (to sanded base sheet only):
    • Apply hot asphalt to the base sheet surface at its equiviscous temperature [minimum 205°C (400°F)] at a rate of 1.2 kg / m² (25 lb / 100 sq ft). Maintain a puddle just ahead of the advancing roll at all times, allowing a positive bleed-out to occur at each edge of the sheet. Never mop more than one metre ahead of the roll.
    • Roll out and press the membrane into the hot asphalt, eliminating any trapped air pockets.Avoid walking on newly-placed cap sheet until it cools.
  5. Torch-adhered sheet:
    • Using a trigger-handled roofer's torch, evenly heat the underside of the cap sheet roll and the top side of the base sheet, creating a liquid sheen on both surfaces.Advance the roll with a hooked bar, ensuring that a minimum 8 mm (3/8") bead of melted coating exudes at the lap edge.Maintain a puddle of melted coating ahead of the roll.


MEMBRANE FLASHING

  1. Cut flashing membrane into suitably-sized pieces one metre wide. Allow for minimum 75 mm (3") side lap, 150 mm (6") lap onto roof deck, and 200 mm (8") up vertical surface.
  2. Asphalt-adhered flashing: apply a full mopping of hot asphalt to the roof surface and press in each flashing sheet ensuring good adhesion.Use a hand trowel to aid in the process.
  3. Torch-applied flashing: use a detailing torch to heat the underside of each flashing sheet and the roof surface.Press each sheet into position with the aid of a hand trowel.
  4. Wherever practical, we recommend flashing be torch-applied rather than asphalt-adhered wherever practical.


PRECAUTIONS

  1. When a torch-applied sheet is to be lapped over a granulated surface (such as end laps), always embed granules on the lower sheet with a heated hand trowel prior to making the lap.
  2. When a mop-applied sheet is to be lapped over a polyfilmed surface (such as end laps), always torch the film on the lower sheet prior to making the lap.
  3. Never install membranes over a surface which contains moisture. Moisture trapped between plies will cause blistering in the future.
    • If a base sheet has been installed and subsequently rained-on prior to cap sheet installation, moisture may become trapped under the polyfilm surfacing. As a precaution against entrapping this moisture during cap sheet installation, torch all polyfilm surfaces at least one hour prior to installing the cap sheets.

2 Membrane Assemblies

2.1 Exposed Membrane - Un-insulated

  • Slope Limitation: No slope limitation for torch applied sheets. 1:4 slope limitation for mopped sheets (consult Hal Industries Inc.).
  • In-Service Performance Min.: <-18°C ( 0°F) Membrane will remain stable but increasingly less flexible with lower temperatures.
  • Temperature of the Membrane: Max.: >+93°C (+200°F)

2.2 Exposed Membrane - Insulated

  • Slope Limitation: No slope limitation for torch applied sheets. 1:4 slope limitation for mopped sheets (consult Hal Industries Inc.).
  • In-Service Performance Min.: <-18°C ( 0°F) Membrane will remain stable but increasingly less flexible with lower temperatures.
  • Temperature of the Membrane: Max.: >+93°C (+200°F) Membrane may lose dimensional stability at higher temperatures.

2.3 Protected and Modified Protected Membrane Assemblies

  • Slope Limitation: No slope limitation for torch applied sheets. 1:4 slope limitation for mopped sheets (consult Hal Industries Inc.).
  • In-Service Performance Min.: <-18°C ( 0°F) Membrane will remain stable but increasingly less flexible with lower temperatures.
  • Temperature of the Membrane: Max.: >+93°C (+200°F) Membrane may lose dimensional stability at higher temperatures.


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