Breathable Sealant

Vapor-permeable water repellent coatings that protect masonry from rain penetration while allowing internal moisture to escape as vapor. Unlike film-forming sealers that trap moisture inside walls (causing freeze-thaw damage and efflorescence), breathable sealants penetrate the masonry surface and line pores without blocking them. Silane and siloxane-based products are common breathable options suitable for Ontario's climate. Application requires clean, dry masonry and temperatures above 40°F for proper curing. Breathable sealants typically last 5-10 years depending on exposure and require reapplication when water stops beading on the surface. They're particularly important for historic brick that must release moisture absorbed from interior humidity or ground contact.