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How to Cut Expanding Foam Flush

When you use expanding foam, particularly inside, then you will often need to cut it back after it has dried. But what is the best way to do this? Well, I will show you a few different ways that I like to use below.

The tools you can use
The tools you can use

These are the three options I turn to most when trimming expanding foam flush. They are a multi-tool, a Hacksaw blade with a handle, and a jab or plasterboard saw.

All three options work well, the multi-tool is obviously the least effort of all three but I know that not everyone has a multi-tool in their arsenal.

Multi-Tool to Cut Expanding Foam

The multi-tool is a get out of jail free card for lots of different jobs. It comes in handy so often when other tools just won’t be able to access the area you want to just. Because the blade just sticks out of the front of a multi-tool it is really easy to get flush cuts in a confined space.

Using a multi tool to cut expanding foam
Using a multi-tool to cut expanding foam

As we are only cutting expanding foam here you don’t need to worry about what blade is on as anything will do the job. Hold the multi-tool flush against the edge of what you are cutting and let it work is magic.

The multi-tool I am using here in the photos is the new Stanley V20 multi-tool, you can find a full review here if you are interested.

Hacksaw to Cut Expanding Foam

Next up is a hacksaw, or really a hacksaw blade. In order to be able to cut flush with a hacksaw, the blade cannot be in a regular frame as this will stop you from being able to get it right up to whatever you are cutting.

You can just hold the blade in your hand and cut this way, or instead, you can get a special handle that hacksaw blades fit into. You can see an example of one of these handles below.

Using a hacksaw blade to cut expanding foam
Using a hacksaw blade to cut expanding foam

Jab Saw / Pad Saw

Mainly used for cutting plasterboard a pad saw can also work well for cutting back expanding foam and cutting it flush. Out of the three options, this would be my least favoured but can work well if it is all you have.

The teeth are a bit big on a pad saw for a job like this which can make a clean cut harder to achieve.

Using a jab saw plasterboard saw
Using a jab saw plasterboard saw

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