Sealing Gaps With Expandable Foam

This is a portion of getting our house to be more energy efficient by decreasing the amount of cold / warm air that leave the inside of the home in summer and winter. Expandable foam is a great product for sealing larger gaps that can’t be filled with caulk.

I kind of had an idea where some problem areas might be, but I did a full walk around outside and the inside walls that touch external walls. These were the areas I found that needed fixing:

Gap around an exterior spigot
Gap around an exterior spigot.



3 holes where a contractor pulled electrical
from the inside to the outside porch.

Side of House Gap
Gap on the side of the house.


Gap around the plumbing
under the kitchen sink.

I used Dap Multi-Purpose Foam Sealant to fill in the gaps and holes. This was about $6 at the Depot.

Dap Sealant
Dap Multi-Purpose Foam Sealant

Filling the gaps and holes was just a matter of shaking the can for a minute, inserting the tube into the nozzle, jamming the tube into the gap or hole and letting her rip.


About To Fill Gap Around Spigot


Jamming 🙂


Applying Foam

It was a matter of minutes to seal the gaps with the foam. It stays in it’s wet form for a few minutes allowing you to scoop off any excess.


Pre-excess cleanup

If the gap is fairly large you might have to apply multiple coats to bridge the area. I had to do this with the gap on the side of the house where the stucco met the roof.

Filled Side Of House Gap
Filled Side Of House Gap

Use water to clean-up. Make sure to clean the tube and nozzle area of the can if you plan to use it again.

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