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How to Lay Foam Insulation Sheets

Foam insulation sheets have some distinct advantages over batt-style roll insulation, depending on the application you're using them for. Foam sheet insulation doesn't require a frame wall or ceiling joists for installation, so it can be applied directly to basement or other unfinished walls with the use of construction adhesives, whereas batt or blown insulation requires the frame of the wall, and the wall panels themselves, to hold the insulation material in place. Another matter simplifying the installation of foam insulation sheets is that the rigid panels can be easily cut to size or trimmed with simple tools. Laying foam insulation sheets is a straightforward process. It's simple to master, even for the novice installer.

Things You'll Need

  • Tape measure
  • Utility knife
  • Straightedge
  • Construction adhesive
  • Caulk gun
  • Vinyl tape
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Instructions

    • 1

      Measure the wall where you'll be fitting the insulation panels. Insulation panels typically are sold in 4-foot-by-8-foot sheets. With your wall dimensions known, determine the number of sheets you'll need and note any obstructions or openings you'll need to cut around.

    • 2

      Place an foam insulation sheet at the corner of a wall. If you need to trim the panel around any obstructions or openings, score the surface of the panel at the correct distances with a sharp utility knife, guided by a straightedge. Snap off the excess foam panel with your hands after scoring the surface. If your ceiling is 8 feet high, you won't need to cut off the length. If your ceiling is 7 feet, 6 inches, however, you'll need to cut off 6 inches by scoring and breaking.

    • 3

      Ensure that the wall is clean. Apply construction adhesive to the back of the panel with a caulking gun. Place the panel against the wall and hold it for several minutes until the glue has a chance to set.

    • 4

      Trim your next panel, if necessary, and place it in position on the wall. Continue laying panels until you've covered the entire surface.

    • 5

      Apply vinyl tape over the seams between the panels when you've finished laying the panels.

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Building Materials & Supplies
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  2. How to Install Rigid Insulation in a Reflective Wall
  3. How to Lay Down Polystyrene (Eps) Sheets for Insulation
  4. How to Re-Side With Exterior Foam Insulation
  5. How to Install Rigid Foam Insulation in a Basement
  6. How to Lay Plaster
  7. How to Put Foam Insulation in Existing Walls
  8. How to Measure Wall Insulation
  9. How Effective Is Block Wall Insulation?
  10. How to Glue Insulation
  11. How to Cut Foam Insulation Sheets
  12. How to Affix Foam Board Insulation to Wood

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