This project in Palatine started with a simple complaint from the homeowner: certain parts of the house never seemed to warm up the way they should. The floors felt colder than expected, and enough draftiness was coming through that it made sense to look underneath the home. At Koala Insulation of Northern Illinois, we see this often when outside air is still moving through lower framing areas that have never been properly sealed.

Why Closed Cell Spray Foam Was Recommended

For this crawlspace, we installed closed cell spray foam along the rim joists and crawlspace walls because those were the areas letting in unwanted air. Rim joists are one of the most common places where outside air slips into a home. Even small openings around framing can affect how the floor above feels during colder months, especially in Northern Illinois where winter temperatures tend to expose every weak point. Closed cell spray foam worked well here because it addressed more than one issue at the same time. It helped stop the air movement affecting the rooms above while also adding protection in a crawlspace where moisture can linger longer than most homeowners expect.

Why Crawlspaces Affect Comfort More Than People Realize

Most homeowners do not think much about the crawlspace until something upstairs starts feeling off.
In many homes, the first sign is the floor. If outside air is moving through that lower space, the rooms above usually show it first. Some areas stay colder, temperatures feel uneven, and the heating system runs without fully solving the problem. The U.S. Department of Energy says sealing air leaks and insulating structural areas helps reduce heat loss and improve indoor consistency.

The Difference After the Job

After we installed the spray foam, the homeowner said the house felt more comfortable overall.
The floors no longer had the same cold feel, and the draftiness that had been noticeable before was reduced enough that the home felt more even from room to room. That is usually the first thing people notice after crawlspace work like this. The temperature from one room to another started feeling much more consistent.

Why the Crawlspace Also Benefited

The goal was better comfort inside the house, but improving the crawlspace itself mattered too.
Spaces like this often hold moisture longer than people realize, so applying closed cell spray foam added protection while the insulation work was being done. You can learn more about Koala Insulation of Northern Illinois crawlspace encapsulation options here:

Final Thoughts

This Palatine project was a good reminder that cold floors often start below the living space.
After the crawlspace walls and rim joists were insulated, the homeowner said the rooms that had felt cold before were noticeably more comfortable. If your home feels drafty or your floors stay cold, call us or visit our website for a free estimate.