What Waterproofing Does, and What It Does Not
Waterproofing is not a first fix. It is the last layer, applied after the actual openings are closed. Spraying repellent over a cracked crown or loose flashing will not stop a leak. Once the crown, flashing, cap and mortar joints are sound, a water repellent reduces how much rain the brick and mortar soak up between storms.
The product matters. Masonry has to breathe, meaning it must be able to let water vapor escape. Paints, many clear sealers and products that form a surface film can trap moisture inside, and in Florida’s humidity that trapped water can make the surface flake and spall. We use vapor-permeable water repellents made for masonry, which soak into the surface instead of coating it.
What Affects the Cost
Drywall, ceiling and paint repairs inside the house are usually separate work, done once the leak is stopped and the area has dried out.
When You Do Not Need Waterproofing
If your chimney is a factory-built chase covered in siding, masonry water repellent does not apply. The fix is usually the chase cover, the storm collar or the siding joints. A painted stucco chimney in good shape may only need its cracks repaired and recoated. And if the water is actually coming from the roof, a skylight, a plumbing vent or an air conditioning line near the chimney, treating the chimney will not help. We will say so.
Before Storm Season
The Atlantic hurricane season runs from June 1 to November 30. Late spring is a good time to have the top of the chimney checked, because a small crack or a loose cap is far easier to fix before the first tropical storm than after water has been getting in all summer. If a storm has already done damage, see our page on storm and fire damage repair. For other chimney problems, start with our chimney repair overview, or call (813) 797-5797.