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How Do You Cut Polyiso Insulation?

James H. Sterling • • 7 min read
How Do You Cut Polyiso Insulation?
Score the insulated foam with your utility knife.
Run the utility knife along the edge of the straightedge, working as closely along the cutting line as possible. Cut closer to the outer edge of the line to prevent cutting too much foam.

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Also to know is, how do you cut Polyiso insulation board?

If you need to cut sheets of how the polyisocyanurate insulation, you should use a utility knife rather than a drywall saw or other type of cutter. When cutting the material, use a straight edge and cut on the side of the foam board that has the foil surface attached (if applicable).

Beside above, how do you install polyisocyanurate rigid foam insulation?

  1. About Polyiso. R-values of R-6 or more per inch.
  2. Place Insulation Boards. Ensure wall is square and true and align boards with bottom edge of wall.
  3. Verify Fasteners. Typical detail for Polyiso wall assembly attachment.
  4. Attach Insulation Boards.
  5. Trim Boards at Openings.
  6. WRB and Flashing.

Likewise, how do you cut a 1.5 inch foam board?

All you need is either a utility knife or an electric saw to make clean cuts.

Part 1 Readying the Cut

  1. Measure your cut with a straightedge ruler.
  2. Mark your cutting line on the foam with a permanent marker.
  3. Lay the rigid foam insulation on a flat surface.
  4. Clamp the rigid foam to the flat surface.

What is Polyiso insulation used for?

Polyiso, or polyisocyanurate, is a rigid foam insulation used in more than 70% of commercial roof construction and offers a continuous insulation solution for commercial flat (low slope) roof insulation and wall assemblies.

Related Question Answers

How do you cut Rmax insulation?

Rmax recommends using a sharp, fine toothed saw for cutting Thermasheath-XP. Use of a utility knife to cut the insulation is acceptable, ensuring to cut all the way through the facing on both sides. Care should be taken to get as clean a cut as possible to avoid excessively sharp and jagged edges.

Can you cut foam board with a table saw?

You can get longer blades for your jig saw too. The faster I cut foam on a table saw, the less meltage I have. Electric knives are great, but a plain old utility knife is a great way to go. Remember, gorilla glue and caulk go a long way to fill any gaps.
James H. Sterling
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James H. Sterling

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.