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Discussion Starter · #1 ·
How would you cut the fiberglass insulation if it had to be cut on an angle?

I wanted it to be the same angle to parallel the pitch of the roof so it does not block air flow from the new soffit vents I just installed all around the house.

I thought about purchasing a wavy edge knife from a home store but didn't feel it was long enough or would cut nice and smooth. I also have a 30 year old pair of 12" long scissors that belonged to my Dad but they may not be the sharpest.

:whistling2:
 

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the Musigician
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if i understand right, the knives won't do it. trim carefully with long scissors, (if you're cutting just the insulation on a bevel.)

DM
 

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It's one of the few times I like to use the Stanley snap blade knife...I don't like trying to mash the insulation to the point of cutting it with a utility knife...

 

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Discussion Starter · #7 ·
Thank's.

I'll try some different techniques and see what works. Now I wonder if someone local has some new long scissors if the razor knife and 2X4 doesn't work.:rockon:
 

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the Musigician
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still confused here.... are you cutting a full piece at an angle or are you trying to trim an edge?

DM
 

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When I did my attic I added unfaced R 19. I used a bread knife and worked like a charm although the wife wasn't too happy at the time anyway until that winter when she just loved the extra warmth in the house, so all was good then :)
 

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Speedball, you want to retain full depth insulation above your top plates. To assure air flow above that you can purchase a 4' long egg crate type baffle which is stapled to the underside of the roof approx every 3 rd joist space.
A serated insulation knife or a bread knife will help with your cutting but insulation above must cover the top plate fully to insure a warm wall below and ceiling at the wall
 
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