Siga Majvest-200 Weather Resistant Barrier


Water Resistant Barriers, or WRB control layers, are essential for air-tightness, water and wind resistance, and prolong the life of your home.

Majvest-200 is an exterior use Water Resistant Barrier (WRB) - acts as both air-tight barrier and water barrier.  Vapor diffusion open, wind and rainproof facade membrane.  For permanent protection of exterior walls while maintaining functional benefits of all insulation layers.  This high performance air and water control layer is key to make a home as air-tight as possible, while keeping the elements out.  For use under rainscreens and other facade applications.


SIGA Majvest-200 is a three layer polymeric membrane backed with polypropylene fleece.

Highly Vapor-permeable

No adhesive backing, mechanically attached

Suitable for exterior moisture control and air barrier applications

Specs & Details

Each roll measures:
59in Wide x 164ft Length
Approximate coverage area: 820sqft

Vapor variability (Perms):

Measuring instructions

To calculate order size for number of rolls needed:

Square footage = (estimated total exterior square footage) * (10% overage)

Divide your total estimate by 820sqft/roll to find the number of rolls needed. Always round up to next full roll.
Example - residing/rewrapping rectangular home:
Rough exterior rectangular house dimensions: 33'W x 39'L x 14'H
Calculate the four walls:
2*(33x14) + 2*(39x14) = 2016sqft

Calculate overage:
2016 * 1.1 = 2218sqft needed

Divide 2218sqft by 820sqft/roll = 2.7 rolls
Round to 3 full rolls as order size
Pro Tip: estimated square footage should include all exterior wall surfaces, possibly including roofs, walls, roof/attic facing ceilings, fascia, any wall contours, cut-outs, etc.

Shipping & Fulfillment

Estimated delivery is 5-8 business days from date of order.
Delivery dates will be confirmed upon order confirmation and coordination with freight/carrier service.

See Go Green Home Supply Shipping & Returns Policy for more details on rates and process.

per Roll
new hampshire new construction home
Significantly Better

High-Perfomance Products

SIGA products are engineered by building science professionals - who are passionate about building better homes to help preserve the environment. The use of SIGA control layer products provides greater comfort to the interior spaces of your home, they save you money and help with better energy efficiency. They also contribute to the longevity of your house by adding integrity to the wall and ceiling assemblies by reducing the risk of damage from water, insects, mold and rot.

apartment building new construction

All Weather Protection

Diffusion-open, wind and rainproof facade membrane for permanent protection of the exterior wall while maintaining the functionality of thermal insulation.

products made from recycled materials

Air - Tight

SIGA's tape products seal seams, intrusions, and cut-outs around any openings like windows and doors, providing comprehensive solutions to air sealing challenges.

environmentally friendly building materials


Majvest is a 3-layer, tear-proof product, while also being flexible for easy handling. This ensures the product maintains its robust properties for long-lasting performance.

Additional product information


SIGA Majvest WRB Install Video

Majvest installation should be done in conjunction with other SIGA products for best results.

Wigluv Seam Sealing Tape is recommended for sealing most seams on Majvest projects:

The goal with any WRB is to create a continuous layer, without openings/gaps. Complete continuity is the goal - and the more thorough the installation, the better results.

For more SIGA specific installation videos and sealing details, visit SIGA's YouTube channel:

SIGA Majvest Cut Sheet and Quick Install Guide

Care & Maintenance

Full SIGA WRB and Air Barrier System Guidelines document provides the most comprehensive details of the SIGA system - Go Green Home Supply's recommended system air/vapor and water resistive barrier layers.

Full SIGA WRB and Air Barrier System Guide


SIGA products are covered by a Factory 10-Year Limited Warranty

For more warranty information, please contact:

SIGA 10-Year Limited Warranty