LeakBarrier: SBS MultiPurpose Underlayment

Uniquely Wrinkle-free and Lays Flat

LeakBarrier SBS MultiPurpose Underlayment

LeakBarrier SBS MultiPurpose Underlayment is a unique and highly versatile glass fiber reinforced sheet sandwiched between two layers of heavy coating of superior quality bituminous compound modified with synthetic resins. Due to its remarkable characteristics, SBS MultiPurpose Underlayment meets the physical requirements of the ASTM liquid water transmission test.

Usage

LeakBarrier SBS MultiPurpose Underlayment is designed for use under composition shingles, shake applications, all types of tile, and metal roofing. It is especially suited for use as a base sheet/ply sheet in modified bitumen, asphalt built-up and cold process roofing systems.

Features and Benefits

  • Use as an alternate for 15, 30 & 40# saturated felt

  • Greater exposure time than ASTM D-226 felts as inorganic glass fiber mat resists the long term effects of moisture

  • Excellent as a valley liner

  • Superior pliability of specially formulated SBS asphalt facilitates a wrinkle free flat laying sheet

  • Fiber glass reinforcement eliminates the rot prevalent with saturated felt

  • Lays flat and resists wrinkling for ease of application

  • Manufactured with 8 ply lines

  • Factory controlled characteristics

  • Surpasses ASTM D-226 Type I & II standards

  • Meets ASTM D 4869 Four Hour Shower Test standards

  • UL Prepared Roofing Accessory

Storage

LeakBarrier SBS MultiPurpose Underlayment requires protection from the elements. Constantly store rolls upright, in a dry location and never install when wet.

General Precautions

  • All roofing materials must be kept clean and free of moisture prior to installation.

  • Slopes 2/12 to 3/12
    For composition roofs install two plies lapping a minimum of 2 inches on side laps and a minimum of 6 inches on end laps . Mechanically fasten to hold in place. For tile roofs see UBC 15 or Tile Manufacturer specifications.

  • Slopes 3/12 and greater
    Install one ply lapping a minimum of 2 inches on side laps and a minimum of 6 inches on end laps. Mechanically fasten to hold in place. Install two plies over valleys, hips and ridges.

Surface Preparation

  • Deck should be clean, dry and free of voids.

Application

Property Typical Value Reference Test
Peak Load, MD & XMD 45 lbf/in. ASTM D 6163
Elongation, MD & XMD 2% ASTM D 6163
Tear Strength 35 lbf ASTM D 6163
Dimensional Stability Pass ASTM D 6163
Compound Stability Pass ASTM D 6163
Pliability @ 77° F Pass ASTM D 4601
Liquid Water Transmission Pass ASTM D 4869
Moisture Vapor Permeability <0.1 U.S. Perms ASTM D 1970

Product Data

Property
Width 36 Inches
Length 66 feet 8 inches
Gross Coverage 2 Squares
Weight 60 lbs. (nominal)

Warranty


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LeakBarrier SBS Multipurpose Underlayment is warranted to be free from manufacturer's defects.

Note: All statements information and data given herein are believed to be accurate and reliable, but are presented without guaranty, warranty or responsibility of any kind, expressed or implied, except as may be indicated otherwise in this literature. Statements or suggestions concerning possible use of our products are made without representation or warranty that any such use is free of patent infringement and are not recommendations to infringe any patent.