Step by Step on How to Cut Rigid Foam Insulation

Rigid insulation foam is the ideal material for insulating a specific area while reducing moisture and mildewing. Rigid insulation foam, unlike some other insulating materials, is easy to cut. Here you’ll get the information on how to cut rigid foam insulation in simple steps.

Also, we will share some recommendations on the best tool to cut rigid foam insulation any novice home repairman can make.

Preparation: How to cut rigid foam board insulation

First steps are the preparation part. Using a straightedge ruler, measure your cut. Measure the length and width of the rigid foam board you’ll need for your insulation before cutting it. Check these measurements against the length and width of your rigid foam insulation to ensure it is long and wide enough.

Use a permanent marker to draw your cutting line on the foam. Use your ruler to guide you as you make the mark on the rigid foam insulation. Draw a line along the side of your straightedge with your permanent marker, then double-check the marking to ensure it’s accurate.

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The key on how to cut rigid foam board insulation nicely is to put it on a flat surface. It would be easier to make a perfect cut if you keep the board flat when cutting.

If you don’t have a work table, cut your foam insulation on a flat and smooth surface.

Attach your rigid foam board insulation to the flat surface using a clamp.  Clamp is utilized to make a precise size, so your rigid foam board could insulate the area well. Secure both sides of the insulation to the work surface with rubber clamps. To produce a precise incision, place the straightedge alongside the cutting line. If you don’t use clamps, your rigid foam board is likely to shift or slide while you try to cut it.

Next Step, Cutting: Best tool to cut rigid foam insulation

Now to the cutting part. To cut rigid foam board insulation, there are tool options you can use such as, utility knife, electric circular saw, hotwire cutter or a putty knife. If you require a precise cut, it is recommended cutting rigid foam with an electric circular saw instead of a knife.

While utility knives are capable of cutting solid foam insulation, table saws provide a cleaner, smoother cut. If you require hard foam insulation cut to exact proportions, buy or rent a table saw.

how to cut rigid foam board insulation

If you use a table saw, then you don’t need to clamp the foam board. You just need to cut the indicated line on the board using the saw’s blade. Hold the portable saw steady in your hands as you guide the blade through the line if you’re using one. To prevent it from sliding, force it through the blade on table saws. But make sure the force is just enough, so you don’t break the board.

Check for flaws in your rigid insulation cut. Make another cut with your electric saw if the insulation appears to be too large or the cut appears uneven. If not, remove any remaining foam dust with a brush and utilize the cut insulating foam in the project.

If you cut your foam board insulation with a utility knife, then using a clamp is a must. To cut your insulated foam, use a utility knife with a segmented blade. The bottom of segmented knives has ridges. These ridges may assist you in manually measuring while cutting the foam board in order to work as nearly as possible along the cutting line.

To avoid cutting too much foam, cut closer to the line’s outer edge. A simple hack, you can heat up your utility knife before cutting the foam to make a smoother cut.

Now you know how to cut rigid foam board insulation. The rigid foam board is a simple to use insulation option that will save you money on your utility expenses. Sculptors and construction workers alike employ a variety of foam-cutting techniques to create stiff foam figures.

Cutting foam insulation and padding with a cutting-foam method is the most risky way. As a result, you must select a cutting instrument with utmost caution and follow the methods outlined above.

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