Brick Waterproofing

This one is about the brick itself — its condition, its porosity, and what the faces are already telling you. No two chimney bricks are alike: a hard, dense, low-absorption face wants a different repellent at a different application rate than a soft, porous, or already-spalling one, and thin brick veneer behaves differently again. We take brick waterproofing on as a diagnostic, condition-driven job — reading the faces first by testing absorption, identifying the brick type, and flagging which courses are spalling or efflorescing, then selecting the siloxane or silane repellent and the coverage rate that fit that specific masonry. Where our chimney-waterproofing service is the whole-stack program that wraps the entire chimney as a unit and checks the crown and flashing, this one stays tight on the condition and product-fit of the brick faces and veneer themselves.

Most homeowners arrive here because of two symptoms — spalling and efflorescence — and each needs its own response before any repellent goes on. Spalling, where the brick face flakes, pops, or sheds its outer skin, means water has already gotten in and frozen, so those faces are addressed first: a breathable repellent over crumbling brick simply seals the damage in. Efflorescence, the white crystalline bloom on the face, is dissolved salt left behind as water evaporates out of the brick — proof of an active moisture path, not a stain to paint over. We clean the bloom, confirm the face is dry, and only then select a repellent, because sealing over salt-laden or actively-wet brick traps the salts and water inside and the bloom just returns.

Product selection is the heart of the job, and condition drives it. A vapor-permeable siloxane or silane is the only correct chemistry for chimney brick — film-forming paints and glossy "waterproofers" trap moisture and spall the face from behind — but within that breathable family the pick is condition-specific: molecular size, solids content, and application rate all match how porous and how sound the brick is, with a softer or more absorbent face taking a heavier, deeper-penetrating coat. And we repair before we seal at the face level — spalled brick cut and replaced, crumbling joint mortar pointed — so the repellent lands on sound, bondable masonry instead of a face that's already failing.

On brick that's been read, repaired, and matched to the right product, a breathable repellent halts the absorption that drives freeze-thaw spalling in the first place — slowing the very deterioration the bare faces were already showing. We're honest about the order: an actively spalling face or an open joint is repaired before any sealer touches it, because waterproofing a deteriorating brick face is money spent locking the failure in. The same read-the-condition, match-the-product, repair-then-seal discipline applies on every centerpiece we're trusted with, and pays off most in freeze-thaw markets, where a porous, untreated brick face is the opening move of the spalling cycle.