Canada homeowner has 4-inch opening causing draft, and DIYers favor expanding foam

For a homeowner in Canada, a draft coming from beneath the kitchen pantry became a surprisingly tricky problem.

Here's what to know

In a Reddit thread, the homeowner said their 1970s house "is not very well air sealed" and described "a nasty draft coming from under my kitchen pantry."

The challenge was the tight clearance. With just 4 inches (10 centimeters) available, a typical caulking gun — often the simplest way to stop a draft — would not fit.

Instead of caulk, one commenter recommended a different approach: "Expanding foam is your best friend! The difference was astonishing when I took off all the trim around my windows, and got everything sealed up."

Another commenter said limited access still might not rule out spray foam, noting, "If the straw is not long enough get a piece of tubing and use that."

More background

Even a small leak like this can make a home less comfortable and drive up heating demand, especially in colder places. When outside air gets in through baseboards, sill plates, vents, or concealed gaps behind built-ins, the heating system has to work harder to keep the temperature steady.

That can lead to colder-feeling rooms and chilly floors while heating bills climb. It can also reduce the payoff from larger efficiency upgrades, since high-efficiency equipment usually performs better in a house that is more tightly sealed.

The homeowner also said they had "just had a heat pump installed" and had already spent much of their budget sealing and insulating the rim joists and sill plate, leaving little room to tear out and rebuild the pantry area.

What can be done?

Commenters said the first step should be figuring out exactly where the air is getting in. One person suggested looking at gaps around the sill, checking for foundation cracks and exterior openings, and considering whether a dryer vent might be letting cold air in when wind hits it the right way.

For a space this tight, expanding foam was repeatedly presented as the most practical fix. Closed-cell spray foam was also mentioned as a better option where moisture or freeze-thaw conditions could matter.

Replying to the suggestions, the homeowner said, "Expanding foam was one idea I had. Good to know I'm not completely crazy for thinking of it. … I've seen spray foam with long tubes that would be ideal for such a tight space."

A targeted air-sealing fix can quickly reduce drafts, waste less heat, and delay the far more expensive step of removing built-ins before it becomes necessary.

Where can I learn more?

Reducing drafts is not the only way to save money on energy costs and make a home feel more comfortable. 

• One homeowner used budget-friendly room dividers to keep chilly rooms warmer in winter.

• In the kitchen, water bottles in the fridge helped reduce wasted energy and money.

• A simple dollar-bill test on fridge doors can catch leaks before bills rise.

• Common freezer insulating tricks can backfire and hurt appliance performance.

• After clearing dust, a neglected refrigerator radiator left one homeowner's appliance running more quietly.

Get TCD's free newsletters for easy tips, smart advice, and a chance to earn $5,000 toward home upgrades. To see more stories like this one, change your Google preferences here.