Spray Foam video - Insulating a 2x4 Wall

Wall Spray Foam Insulation is an extremely common project.  It's quick and easy to do.  Plus the benefits range from much lower utility bills to reduced sound transfer.  Here's how to do 2x4 walls with Foam it Green spray foam insulation.

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Full Fill

If you want, tape off the studs with painter's tape so you can easily pull off the tape later and have clean studs ready for sheetrock.

Use a drop cloth on the floor to protect areas from any falling "snow" (foam particles)

Spray on Foam it Green so it rises to an inch or two in each cavity.  Move to the next cavity and repeat.  Typically for filling stud bays, the fan spray tips help broaden the spray so the foam goes on fast and about the width of the cavity.

Once all the stud bays are full with the first coat, make sure it's cured.

If they have, repeat the process, building upon the previous inch an inch or two at a time.

For the final coat, move faster so you just get a quick coat.

Full out, you can spray a 602 in 30-40 minutes, so while this may sound slow, it's in fact the fastest and easiest way to seal and insulate walls.

If you overfill, just use a serrated knife to shave back the spots so you can put up drywall.

Your walls now have a seamless air barrier that saves massive amounts of energy, along with a high r-value of roughly 24.  Your walls also stop sound transfer and provide a large deterrent to pests.

Partial Fill

Some people can use just 1 inch of Foam it Green closed cell spray foam insulation and others need more.

It depends on the project and where you live.

According to building scientists, the general rule to follow is:

If you heat during the winter, you need 50% (or more) of the total R-value of an enclosed wallinsulation in Foam it Green closed cell spray foam.

Here's why. The dew point happens when hot air meets cold air. The cold air cannot hold the moisture in the warm air, so it turns to water and drops from the air, creating condensation.

If this condensation happens in Foam it Green closed cell spray foam, the condensation has nowhere to go. If the dew point happens in the open cell foam or fiberglass, you'll have condensation between the foam and the other insulation.

You just need to make sure you accommodate for the dew point so you don't have moisture issues.

• 2x4 walls = 3.5 inches of space.
  1 inch Foam it Green Closed Cell = R-7, 2.5 inches fiberglass = R-8.75. R-7 isn't 50% of the wall's r-value, so you DON'T want this if you heat in the winter.

• 2x4 walls = 3.5 inches of space.
  2 inches of Foam it Green Closed Cell= R-14, 1.5 inches fiberglass = R-5. The Dew Point will be in Foam it Green and thus minimize moisture issues.

If you want, tape off the studs with painter's tape so you can easily pull off the tape later and have clean studs ready for sheetrock.

Use a drop cloth on the floor to protect areas from any falling "snow" (foam particles)

Spray on Foam it Green so it rises to an inch or two in each cavity.  Move to the next cavity and repeat.  Typically for filling stud bays, the fan spray tips help broaden the spray so the foam goes on fast and about the width of the cavity.

Once all the stud bays are full with one to two inches, make sure it's cured.

If they have, repeat the process, building upon the previous inch an inch or two at a time.

For the final coat, move faster so you just get a quick coat.

Full out, you can spray a 602 in 30-40 minutes, so while this may sound slow, it's in fact the fastest and easiest way to seal and insulate walls.

Your walls now have a seamless air barrier that saves massive amounts of energy along with Foam it Green's high r-value of 6.7 in 1 inch. Your walls also stop sound transfer and provide a large deterrent to pests. Your family also enjoys a much better air quality.

• Read More about Flash & Batt / Flash & Fill
• Read More about Vapor Barriers

What Customers Say

"I'm in the process of remodeling a home built in the 20's. I used the spray foam kits in the exterior wall cavities-noticed a substantial difference in noise reduction and the homes ability to maintain heat. Very happy with the product, ease of use, and the exceptional customer service!"

Jim G.
Oconomowoc, WI

"I used your Spray Foam Product on my basement walls and within the rim joists. I couldn't believe how easy this was to use. I took me about 1 hour to finish 175 linear feet of space. That's a fraction of the time it would have taken me if I used rolled up batt insulation.

"I received the biggest compliment on the temperature of my basement just this past weekend. A neighbor and I were completing our basements at the same time. He, a former construction contractor, commented on how much warmer my basement was than his. He asked me what kind of insulation I used and when I told him, he was surprised of the effectiveness and warmth it provided. He used styrofoam boards for insulation and in his words, didn't come close to the effectiveness of spray on foam. From a former contractor's mouth, that's quite the compliment."

James S.
Joliet, IL

"The product is easy to apply and a very efficient insulation. I had 3/8 inch expanded foam board plus 3 inch fiberglass in 2x4 walls plus 3/4 inch expanded foam in ceiling and when it got cold out my 3000 watts of electric heat was struggling to keep cabin at 50 degrees. I removed the fiberglass and sprayed over the foam board. Checked temperature today 6 hours after cold front hit with 20 mph wind and it was still 70 degrees with only one heater running on the 900 watt setting and turned down to half on the thermostat. I could have saved a lot of time and money if I had known how great this stuff is. Will purchase Foam It Green again, when I get ready to do crawl space."

Ron L
Garnett KS

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