Malarkey SBS Membrane Installation Guidelines

Jump to: navigation, search

Malarkey 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.


Contact Address: See Membership List Section 1


Country of Origin: United States

Country of Manufacture: U.S.A.

Year First Installed
U.S.: 1978
Canada: 1979

1 Description

Malarkey Roofing has been manufacturing bituminous roofing products since 1956 and introduced SBS Modified Bituminous membranes in 1978. Only the highest quality raw materials are utilized in a manufacturing process which impregnates and coats fibreglass or Polyglass reinforced mats with SBS modified bitumen.

Malarkey manufactures a wide variety of membranes designed to satisfy the demands of varied roof and climatic conditions. These membranes are available with ceramic granules, metal foil or sanded finishes designed to be installed with hot asphalt, propane torch or cold-process adhesives in all types of roofing / waterproofing systems.

1.1 General

The roofing assembly / material information published in the RoofStar 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. For use over roof decks in commercial, institutional and industrial applications, wherever built-up roofing is presently used.
  2. As a fully adhered 2-ply (or more) system on flat, curved or domed roofs over most types of insulation.
  3. As a roofing membrane over existing roofs in recover or replacement applications.


  1. Deliver and store materials in original containers showing product and manufacturer's name and date of manufacturer.
  2. Store rolls on end only, selvage edge up, elevated from contact with ground and moisture. Cover with plastic tarpaulin or place in weatherproof shelters so as to keep materials dry at all times.
  3. Distribute materials on roof to avoid concentrated loading, having first discarded rolls which may have been flattened, creased or otherwise damaged.


  1. Slope range: from dead level up to and including vertical. The choice of membrane combination and its suitability for a particular slope is governed by the type of deck, insulation used, fastening capability, application method, type of finished surface of membrane and potential for stress on the membrane. Please consult Malarkey for assistance in identifying these factors and in determining the correct choice of materials.
  1. Slope Limitations
    • Minimum recommended slope 1:50 (1/4" in 12")
    • Mechanically fastened over 1:8 (1-1/2" in 12")
  2. Minimum ambient application temperatures:
    • Hot asphalt applied -7°C (+20°F)
    • Torch applied determined by tolerance of applicator
    • Cold process applied +4°C (+40°F)
  3. Chemical incompatibility: incompatible with coat tar pitch. Not resistant to oil or most petroleum products. Consult Malarkey for specific requirements.

STANDARDS AND APPROVALS (for specific membranes or assemblies consult manufacturer)

  1. CAN / ULC Class A or B.
  2. Underwriters Laboratories Class A or B
  3. Factory Mutual meets or exceeds 190 test for wind uplift.
  4. Canadian General Standards Board conforms to CGSB 37-GP-56M.
  5. Warnock Hersey Listed


  1. Applicator training: warranted Malarkey Roofing Systems are applied by approved roofing contractors.
  2. Technical Services: a Local Malarkey representative is available for consultation and field training.
  3. Specifications / drawings available from specifications manual.
  4. Seminars presented upon request.


  1. Torches: use only torches designed for torching roofing material.

1.2 Materials



  1. Apply roofing materials over clean, dry surfaces in accordance with RoofStar Guarantee Standards good roofing practices.
  2. Ensure roof has adequate slope to drain.
  3. Use only compatible adhesives / mastics / sealants.
  4. Provide adequate protection against fire, particularly when using propane torches.
  5. Apply base sheets with hot asphalt or cold process adhesive only to adequately prepared primed substrate.
  6. Ensure moisture, in any form, is completely removed from substrate prior to membrane application.


  1. Prime concrete, masonry, wood and metal surfaces to be directly bonded with bituminous membranes.


  1. Mechanically fasten insulation over nailable decks, in accordance with RoofStar Guarantee Standards.
  2. Embed insulation in a 1.5 kg / m² (30 lb / square) mopping of hot asphalt over non-nailable deck.
  3. Install 11 mm (7/16") asphalt impregnated fibreboard as an insulation overlay where required by RoofStar Guarantee Standards.
  4. Install wood nailing strips on slopes exceeding 1:8 (1-1/2" in 12").


  1. Start at low point and apply at right-angles to slope. Where slope exceed 1:6 (2" in 12") install parallel to slope.
  2. Asphalt-adhered: apply asphalt to substrate at a rate of 1.2 kg / m² (25 lb / square), at minimum 205°C. (400°F) for Type I asphalt up to 230°C (450°F) for Type 4 and SEBS asphalt, at point of application. Mop no further than 1.5 m (5') ahead of unrolling roll of material. Lap sides 50 mm (2") and ends 150 mm (6") unless otherwise specified.
  3. Cold-process adhered: apply to substrate at a rate of 0.8 L / m² (2 gal / sq.), at a minimum ambient temperature of 4°C (40°F). Lap sides 50 mm (2") and ends 150 mm (6"), unless otherwise specified.
  4. Backnail base sheet at 225 mm (9") o/c on slopes exceeding 1:8 (1-1/2" in 12"), into nailing strips if required.
  5. Carry base sheet to 50 mm (2") above top of cant unless otherwise specified.


  1. Starting at low point, in same direction as base sheet, unroll and align cap sheet. Cut into maximum 5.03m (16.5') lengths. Stagger end laps a minimum of 900 mm (3'). End laps and side laps to be a minimum of 450 mm (18") from laps in base sheet.
  2. Asphalt adhered: embed cap sheet in a full mopping of 1.2 kg / m² (25 lb / square) asphalt at minimum 205°C (400°F) for Type I asphalt up to 230°C (450°F) for Type 4 and SEBS asphalt at point of application. Mop no further than 1.5 m (5') ahead of unrolling material. Broom sheets to ensure smooth wrinkle-free application. Ensure bleed-out of asphalt at all seams to obtain 100% adhesion. Embed Loose granules in bleed-out.
  3. Cold-process applied: embed cap sheet in cold-process adhesive at a rate of 0.8 L / m² (2 gal / square). Broom sheets to ensure smooth wrinkle-free application. Ensure bleed-out of cement at all seams to ensure 100% adhesion. Embed loose granules in bleed-out.
  4. Torch adhered: torch onto suitable base sheet only. Ensure membrane is fully bonded as cap sheet is unrolled.
  5. Back-nail cap sheet at 225 mm (9") o/c on slopes exceeding 1:8 (1-1/2" in 12").
  6. Carry cap sheet 100 mm (4") above top of cant, and at least 150 mm (6") above finished roof system unless otherwise specified.


  1. Install Malarkey base and cap flashings to extend a minimum of 150 mm (6") onto roof from base of cant and at least 200 mm (8") above finished roof system, unless otherwise specified.

2 Membrane Assemblies

2.1 Exposed Membrane - Un-insulated

Slope Limitation: NO LIMIT
In-Service Performance: TBA
Temperature of the Membrane: TBA

2.2 Exposed Membrane - Insulated

Slope Limitation: NO LIMIT
In-Service Performance: TBA
Temperature of the Membrane: TBA

2.3 Protected and Modified Protected Membrane Assemblies

Slope Limitation: 1:4.8 (2-1/2" in 12")
In-Service Performance: TBA
Temperature of the Membrane: TBA