How to Seal Gaps in a Tongue and Groove Porch Floor

A lot of homes in the Philadelphia area have wood tongue and groove porches. Water can get into the joints as the wood moves with age and weather. By sealing the joints with a polyurethane caulk you can protect your porch from rot to the boards and the supporting joists underneath.

Sealing a tongue and groove porch is a project that a homeowner can do with the right tools and a little bit of time. But, it's important to make sure that Henny damaged boards and structure have been replaced or repaired first.

Here we show you how to seal a tongue and groove porch in Roxborough Philadelphia with polyurethane sealant.

To seal your porch you'll need a polyurethane caulk sealant, I used Loctite PL Polyurethane Sealant (labeled for use on concrete), mineral spirits, a plastic spreader, rubber gloves, and rags. Make sure the to dispose of rags properly to avoid spontaneous combustion.

Apply a small bead of sealant along the open joints. Dip the spreading tool in mineral spirits and use the tool to push the sealant into the joints. Then wipe away any excess with mineral spirits and a rag. The sealant will take 3 to 6 hours to dry and one week to cure.