Although Mortairvent Membrane can be used with any siding, it should really earn its keep with masonry-based systems: stucco, manufactured stone, brick, and EIFS. It consists of a polypropylene mesh for drainage and ventilation, and a filter fabric that keeps mortar from clogging the mesh. Expect to pay 50 to 60 cents per square foot. Advanced Building Products, 800.252.2306, advancedbuildingproducts.com
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