Expanding foam blade

[Moparfan90]

I have a window job coming up and want to use my new vecturo. What blade do you recommend for cutting the foam flush

 

[Sparktrician]

You might want to take a look at antique hay knives for this, especially if you have to span stud bays. 

 

[Moparfan90]

I use the foam around the window in the small area where you shim it. To stop any drafts.

 

[Thunderchyld]

I'm assuming you're talking about cutting the expanding foam used to fill the air gap between the window return and the blocking studs.  I'm used to using a cheapo serrated knife blade from HF on my Fein.  Pretty much any saw blade will cut foam without a problem.  Looking at the list of blades for the vecturo, don't use a blade with Japanese style teeth, the foam particles clog the teeth.  Not enough to stop it from working, just enough to make it annoying. 

Either of festools window blades should do you just fine.  500136 is a "traditional"(as far as an oscillator has tradition) saw blade, offset for cutting flush.  500137 has serrations rather than saw teeth from the looks of the picture, and the sharpened edges kind of make me think a glazier designed it specifically for removing window putty. 

If you have a lot of space to span, such as the aforementioned stud bays, you'll want to look into a tool designed for foam.  The hay knife idea works, but they're so thick.  Think more along the lines of a bread knife blade.  Foam's easy to cut with a sharp tool, and let the tool do the work.  Part of the reason serrations are so useful for foam, you want to cut it with as little drag as possible. 

My scarfing saw is essentially a straight line sander with a 23" serrated blade sticking out the front.  There are also foam planers, but unless you're installing full houses of insulation they're just too much. 

On the topic of foam, if you're cutting flat sheet foam, Bullet tools makes a circular saw blade designed for sheet foam.  Not as useful to someone who has a track saw with dust extraction, you never see the foam sawdust.  I still have yet to buy a track saw, so I found the blade quite useful when we were building up angles on a flat roof with 2" thick XPS sheets.  No more blue snow, lol.

 

[Moparfan90]

Thanks. I have a few cheap blades I'll try them and see what works best.