Window & Glazing Seal Repair

Most commercial window and storefront leaks come from failed seals, not broken glass. We replace perimeter sealant, glazing gaskets and sill flashing to stop leaks and drafts.

Where seals fail

Perimeter sealant between the frame and the building, which cracks and pulls away with movement and UV exposure.
Glazing gaskets and tapes that hold and seal the glass in the frame, which shrink and harden with age.
Frame joints at corners and mullion intersections, sealed at the factory or in the field.
Sill flashing and end dams that collect and drain water, which can be missing or failed.

Doing sealant work properly

Running a new bead of caulk over an old one rarely lasts. Proper sealant repair means cutting out the failed sealant, cleaning and priming the surfaces, installing backer rod for the right joint depth, and tooling a sealant compatible with the frame and the wall material. Joint size and movement capability matter, especially on long runs and between different materials.

Gasket replacement

Glazing gaskets that have shrunk leave gaps at the corners where water gets in. Replacing gaskets usually means removing the glass stops or pressure plates, pulling the old gaskets, and installing new ones of the correct profile, with corners sealed. On some systems the glass must be removed and reset.

Testing the repair

After repairs on a chronic leak, we water test the area to confirm it is dry. If water still gets in, the source is elsewhere and we keep looking, rather than calling the job done.