Service — Water Management
Waterproofing for Masonry Buildings in NYC
Brick and stone are porous: unmanaged water migrates through the wall, corrodes embedded steel, and spalls the masonry face every freeze-thaw cycle. Waterproofing stops the water where it enters — and on this service, Perfect Construction USA Corp coordinates the project and the work is delivered through specialist third-party partners and subcontractors.
Start at the Entry Point
Find Where the Water Gets In
A leak that shows inside often starts several feet above or beside the wet spot. The usual sources are failed mortar joints, damaged flashing or coping above the wall, and cracks that let wind-driven rain bypass the wall's drainage path. That is why the scope begins with finding the entry point — coating the interior stain treats the symptom and leaves the wall wet.
A correct scope seals the entry points while still letting the wall dry, so moisture is never trapped inside the masonry.
Scope of Work
Where Waterproofing Applies
- Repointing and sealing failed exterior joints — the most common entry point
- Parapet and coping repair, where roofline water gets behind the facade
- Crack repair and breathable water-repellent coatings on masonry elevations
- Membrane systems at roofs, terraces, and transitions
- Below-grade and basement wall waterproofing, scoped from the exterior entry point
Waterproofing is usually one part of a masonry scope — failed joints are repointed as part of the same visit. See the brick pointing page →
Questions & Answers
Waterproofing Questions, Answered
How does waterproofing protect a brick or masonry building?
Waterproofing protects a masonry building by stopping water at the surfaces where it enters — open joints, cracks, parapets, and below-grade walls — using repointing, sealants, membranes, or breathable water-repellent coatings as the location requires. Because brick and stone are porous, unmanaged water migrates through the wall, corrodes embedded steel, and spalls the masonry face in freeze-thaw cycles. A correct waterproofing scope seals the entry points while still letting the wall dry, so moisture is not trapped inside.
Why is water leaking through my brick wall?
Water usually leaks through a brick wall because the mortar joints have failed, the flashing or coping above the wall is damaged, or cracks let wind-driven rain bypass the wall's drainage path. Brick itself absorbs water, so a leak that shows inside often starts several feet above or beside the wet spot. Finding the entry point — not just coating the stain — is the step that makes a waterproofing repair last.
Who waterproofs basements and below-grade walls in NYC?
Perfect Construction USA Corp coordinates waterproofing for masonry buildings across NYC — delivered through specialist third-party partners and subcontractors — including below-grade walls and the exterior joints, parapets, and cracks where water enters. Because basement leaks usually start at failed exterior joints or flashing, the scope begins with finding the entry point rather than coating the interior stain. The company is based in Brooklyn and can be reached at (347) 335-8089 for a free estimate.