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Projects – How to Quickly and Easily Insulate an Existing Wall

We live in a 1930’s Tudor, with no insulation in the walls. As part of our master bedroom/bathroom upgrade we used FoamItGreen slow rise. These rooms are now the warmest/quietest rooms in the house. – Simon M., Washington DC

Use Slow Rise Foam it Green for Retro-filling Existing Walls

Want to insulate a closed wall that’s empty inside? Got plaster walls? Got drafts? Use our Slow Rise formula.

It’s the same great formula as our regular fast rise- E84 Class 1 Fire Retardant and Anti-Microbial. But, it rises slowly so you can pump it into the wall. Foam it Green is the ONLY BRAND who’s slow rise is fire retardant.

Make your home warmer in the winter and cooler in the summer
Lower your energy bills
Stop uncomfortable drafts without having to take down your wall
Stop sound transfer
Stop bugs and rodents from nesting in your walls
And because it never sags nor settles, once it’s in place, it’s done!

By using Slow Rise Foam it Green, you create a seamless air barrier behind your existing walls and massively increase your wall’s R-value. You’re sealing and insulating in one step.

Watch this video to see the steps on how it’s done. You can buy just the Slow Rise foam kit from us, or you can also buy the tubing you see in the video to come with your kit.

If you want to insulate an enclosed wall that has fiberglass inside it, use our DropFill product.

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How to Use Slow Rise in Existing Walls

Slow Rise


 How to Quickly and Easily Insulate an Existing Wall:

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051613 Foam Installation Instructions1) Follow all of the instructions in the included instruction manual regarding proper Foam it Green setup, project area preparation, and substrate readiness. Make sure that you have all of the tools required for the job. (see Tools)

2) It is recommended that the wall cavities be empty/free of other forms of insulation.

3) Using a stud finder, find and mark the locations of internal framing members such as studs, cross braces, and fire stops. (Fig. 1)

4) Drill 1” diameter holes in each empty cavity, no more than 3’ from each other as well as framing members. Drill a 1” hole at the very top of each wall cavity. (Fig. 2)

5) Pull electrical outlets and switches from their housings, making sure power is off. Tape the inside of the housings, so that expanding foam will not penetrate into them. (Fig. 3)

6) Cut 5/16” 7/16” tubing into 3’ lengths. Connect tubing to end of black mixing nozzle using electrical tape as shown (Fig. 4A&B). Working from the bottom up, with nozzle attached to spray gun, fish extended tubing into the bottom-most 1” dia. hole (Fig. 4C). Guide tube downward toward bottom of wall (Fig 4D) and begin spraying foam (Fig. 4E), slowly pulling nozzle up and out as you spray. Work horizontally to fill all the bottom segments, allowing time for previous cavities to expand and cure.

7) Tapping on the wall can help you determine the level of the foam. Repeat #6 with the next hole up the wall.

8) If the foam expands out of the hole, it should be trimmed flat with any serrated edge before patching the wall.

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Download this page as a printable PDF >>

Call 1-800-516-0949 for help in purchasing your kits.


Additional Closed Cell Kit Details:

The Easy to Use Spray Foam Kit

  • Spray foam insulation that’s convenient and easy to use.
  • R-Value of 7 in 1 inch – 97% Closed Cell Foam. The best wall, basement or attic insulation.
  • Class I E-84 Fire-Retardant – meets building code spec.
  • 100% Free of CFCs, VOCs, Penta-BDEs, & Urea Formaldehyde
Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r-value in just 1 inch. Choose Foam It Green spray foam insulation kits and don’t settle for less than you deserve.

If you’d like to start saving money and time today, buy Foam it Green Spray Foam Insulation>> now or call us at 800-516-0949. In 60 seconds you’ll be on your way to paying lots less when you use Foam it Green.