Floor Insulation

Serving the Boise Area

Cold Floors?
High Winter Heating Bills?
We Can Help.

Insulating your floors the right way will help keep your home comfortable and efficient through the winter. And with our never-fall floor insulation guarantee, you’ll never have to worry about cold floors again.

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How Floor Insulation Works

Your floor insulation is the thermal barrier between your indoor living space and your home’s crawlspace below, keeping your floors warm during the winter and saving you money on your heating bills.

Floor Insulation Will Give You:

Warmer Floors

Cold feet? Insulating your floors will help keep them warm through the winter.

Lower Heating Bills

When your heater doesn’t have to run as much to keep you warm in the winter, you save on your heating bills.

Less Drafts

We always air seal your subfloor before installing floor insulation, leaving you with less cold drafts in your home.

Why Choose Us For Your Floor Insulation Project?

See What Our Past Customers Have to Say

Want to Know How Floor Insulation is Installed?

Here’s How We Insulate Your Floors

The right way to insulate your floors

The 5 Things That Matter Most When Insulating Your Floors

Just because there’s insulation in your crawlspace doesn’t mean it’s doing its job. These are the 5 things we focus on most when installing floor insulation to make sure the job gets done right and you get the results you’re looking for.

1. Insulate The Correct Surface

If you see foundation vents at ground level around the outside of your home then you have a vented crawlspace, and if you have a vented crawlspace then you’ll want to insulate your subfloors, not the foundation wall.

No matter how high the R-value of your foundation wall assembly, if air can circulate between the outdoors and your crawlspace it will carry heat with it. The end result: if your crawlspace is properly vented, all of that insulation on your foundation walls isn’t really achieving anything.

floor insulation mistakes - insulating foundation wall
2. Air Seal First

Insulation is a great thermal barrier but it does little to stop airflow, so to maximize the effectiveness of your insulation you want to seal any gaps that allow airflow between your living space and your crawlspace. Local building code was updated in 2003 to require air-sealing in all new residential construction so if your home was built since then you can probably skip this step, but in our opinion this is a must-do for older homes (whether or not you’re insulating your floors). You’re already going to be crawling around your crawlspace and a few cans of air-seal foam cost a fraction of what the insulation does, so take the extra time to do the job right.

floor insulation mistakes - no air sealing
3. Don’t Let The Insulation Sag

Make sure that the top of the batt insulation you’re installing is in full contact with the subfloor, otherwise air will be able to flow between the insulation and the subfloor, rendering the insulation useless (are you noticing a pattern here?). The easiest way to make sure there’s no gap is to use batt insulation with a thickness that matches the depth of your floor joists. This takes out the guesswork involved with trying to make sure that the top of the batt is in full contact with the subfloor without being over-compressed (more on this in #4).

floor insulation mistakes - batt insulation gap
4. Don’t Compress the Insulation

For the same reason as a tight fit against the subfloor is important, you want to make sure that there are no gaps between or around your batts once they’re installed in the framing cavity. Even small gaps here and there will add up and reduce the effective R-value of your flooring assembly as a whole much more than you’d think (the physics of this is explained by Fourier’s Law – we’ll have a full article about this soon).

floor insulation mistakes - compressed batt insulation
5. Secure The Insulation Properly

It may seem like your insulation will stay in place on there own and securing the insulation takes some extra time, but trust us when we say that it’s well worth the upfront effort to be sure that you won’t be back in your crawlspace in a few months after gravity has inevitably won the battle against your unsecured batts that are now sitting on your crawlspace floor. Wire batt hangers will usually do the job, but for irregular joist spacing you’ll want to use twine and staples instead.

floor insulation mistakes - unsecured batt insulation

Ready to Get Started?

You Have Questions?

We Have Answers

What does “R-Value” mean?

The “R-value” of a material is a measure of its thermal resistance – you can think of it as its “insulating power” of the material. The higher the R-value, the greater the insulating power!

What R-value should my floors be?

When possible, we recommend insulating floors to an R-value of R-30. This is based off of the International Residential Construction Code (IRCC) recommendation for our climate zone here in the Boise area and we’ve found that R-30 floor insulation yields the best results for homeowners we’ve worked with in the past.

What type of insulation is best for floors?

Fiberglass batt insulation is the most cost-effective type of insulation when insulating the floors of your existing home.

How important is floor insulation?

While not as important as attic insulation, insulating your floors will help keep you comfortable and improve the energy efficiency of your home, especially in the winter.

How long does it take to insulate floors?

Our install time for floor insulation varies based on the size of your home and complexity of your crawlspace, but we can typically insulate the floors of homes under 2000 square feet in one day and 2000-4000 square feet in two days.

Have a question we didn’t answer?

Ready To Get Started?

Schedule your complimentary crawlspace insulation inspection & quote today.