How to Insulate an Asphalt Box

Foam insulation is also used to insulate pipes and other irregularly-shaped items.

Asphalt boxes are used for outdoor storage of goods, or to house electrical or plumbing hubs. To keep the materials inside the asphalt box from being damaged from water or extreme temperatures, insulate the interior of the box using spray foam insulation. This insulation comes in a can similar to spray paint, and keeps air, pollen, moisture and dust out of the interior of the box.

Things You'll Need

• Spray foam insulation (amount depends on the size of the box)

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Instructions

1. Shake the can of spray foam insulation for 30 seconds. Remove the cap.

2. Spray a test strip 6 inches long along one of the interior seams of the box. This insulation expands to 100 times its original volume, so become familiar with the final expanded size before continuing.

3. Spray along all the seams of the box. Allow the foam to fully expand before continuing.

4. Spray in straight lines, left to right, along the interior bottom and sides of the box. After spraying each line, wait until the foam fully expands before continuing on to the next line.

References

• Spray Foam: Spray Foam Insulation Guide for Homeowners
• HGTV Pro: How to Use Spray Foam Insulation