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SIGA Majvest 500 SA Self-Adhering Permeable Membrane

SKU 8920-046030
Original price $259.75 - Original price $869.30
Original price
$259.75 - $869.30
Current price $259.75
in stock
in stock

The Majvest® 500 SA is an excellent solution for seamless, hassle-free construction projects. This self-adhering, vapor-permeable membrane is engineered with a pressure-sensitive glue on its reverse side, ensuring effortless direct bonding to various substrates. Say goodbye to the need for primers, as Majvest 500 SA offers remarkable adhesion to common building materials such as concrete, plywood, gypsum, and metal, even in chilly weather conditions. Its exceptional adhesion performance endures scorching summers and freezing winters, ensuring your project stays on track year-round. Experience the efficiency of a fast and clean application process, requiring minimal labor, thanks to the tear-resistant release liner with a convenient 50/50 split back. With Majvest 500 SA, your construction project will proceed smoothly and swiftly, regardless of the season or substrate, making it the go-to choice for professionals seeking reliability and ease of use.

Majvest 500 SA comes in two sizes:

  • 18 inches wide, 100ft long (covers 150 sqft)
  • 60 inches wide, 100ft long (covers 500 sqft)

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Dimensions - 18"100 / 5 / Pass
Dimensions - 60"30.48 / 1.524 / Pass
Total Weight

0.84 oz/ft2

256 g/m2


28 mils

0.7 mm

Maximum UV ExposureIECC Climate Zones 3-8 - 6 months 
Water Vapor Transmission(ASTM E96 Method A / Dry-Cup) 16 US perms
Minimum Recommended Installation Temperature14°F (-10°C)
Puncture Resistance (ASTM E154)92 lbs 
Tensile Properties

6.83 (39) N/mm (lbs/in)  MD

6.65 (38) N/mm (lbs/in) CD

Water Vapor Transmission 

16 (918) US Perms (Ng/Pa.m². s)

24 (1355) US Perms (Ng/Pa.m². s)

Water Resistance Under Hydrostatic PressurePass: 5h @ 55cm head AATCC 127
Water Resistance (Ponding) (ASTM E2556)

Control Weathered


Pass No water penetration

@penetration after 2 hours

Air permeance (CAN/ULC-S741- 08/ ASTM E2178)Pass:  <0.02 L/(s•m²)@75Pa
Air Leakage in Assembly 0.0025 L/m².s @ 75 Pa (ASTM E2357 including ASTM E283)
Air Leakage Rate Classification (CAN/ULC-S742- 11 )Classification A1
Water Resistance (ASTM E331 )Pass (no leak) 15 min @ 12.11 psf on Penetrated Wall 
Lap Adhesion (ASTM D1876)Pass
Nail Sealability (ASTM D1970)Pass 
Flame Spread Index (ASTM E84)20 (Class A) Index (rating) 
Smoke Developed Index (ASTM E84 )20 (Class A) Index (rating) 

Documentation and Tear Sheets

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