Cavity Drainage & Weep Vents Whether you're looking for cavity insulation boards or weep vents, we have the cavity wall insulation materials you need at truly affordable prices. Our masonry cavity wall insulation boards by Thermadrain feature a high-quality closed cell polyisocyanurate rigid insulation with a high impact non compressible styrene drainage panel adhered to its face. These Thermadrain insulated drainage boards eliminate the need for excessive, open airspace in drainage walls and eliminates the concern of mortar droppings in the cavity.
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