What type of blade?

[Backyard Imports]

So I am looking for a blade to use in my table saw to cut through some 2” rigid foam that is enclosed in fiberglass. I know that it sounds a bit strange but I got an unlimited supply of door sections that I want to use to insulation one of my outbuildings. (Basically, a door company has solid slabs and then uses a CNC router to remove the center sections to install glass.) I want to be able to just run them through my table saw and cut them down to 14.5” to use between wall studs.

I am unsure if I should just find a blade that has a ton of teeth and is a bi-metal type or maybe get something more along the lines of a cut off/abrasive wheel.

What do you guys think?

 

[never enuf time]

If the table saw is a good one, I might be concerned about the fiberglass wrecking it.

If it's not top notch, go for it with a cheap carbide blade. Can use a cheap 7 1/4" blade flipping it over to complete the cut.

 

[Backyard Imports]

“Flipping it over”? Do you mean running it backwards? I have never done anything like that before. What does it accomplish?

And the saw that I would use is a $300 portable setup from Home Depot. Nothing special.

 

[Wamsutta]

I would just use the same blade I use for everything else. Those Diablo blades leave such a smooth cut that you'd think something was cut with a 60 tooth blade when in fact it was cut with a 24 tooth framing blade.

 

[unslow1]

I used a regular blade when I sided a couple of houses. The vinyl would start chipping a little when the blade was getting dull.

 

[unslow1]

“Flipping it over”? Do you mean running it backwards? I have never done anything like that before. What does it accomplish?

And the saw that I would use is a $300 portable setup from Home Depot. Nothing special.

We flipped the blade when doing flooring. That worked well. I don't think I would try it with fiberglass.

 

[tab2]

Use your normal blade. When you’re done, pitch it for the next time you cut wood.

 

[exmaxima1]

A blade with negative rake teeth would work well. Anything that cuts non-ferrous metals and plastics is typically negative rake. Only issue is that the material might want to lift, so run the blade high and/or make some sort of hold down jig.

 

[never enuf time]

I should have said flip the panel. If using a cheap 7 1/4" blade it might not cut all the way thru, so would need to flip material over to take another bite at it.

 

[Voi]

I should have said flip the panel. If using a cheap 7 1/4" blade it might not cut all the way thru, so would need to flip material over to take another bite at it.

This might not be a bad thing for the OP as the two non-through cuts might keep some of the fiberglass dust contained. Of course it requires that the edge against the saw is straight and flat.

 

[seber]

Use any cheap carbide blade but make sure you have a vacuum setup and full face mask including sealed eye protection. I would try to do it outside in a strong wind. Fiberglass is super nasty.

 

[rustyjames]

Total agreement about doing this outside in a strong wind and full Tyvek suit. Fiberglass really ***** when you get a good dose of it on your skin.