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Old 06-03-2009, 08:40 PM   #1
 
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.....cutting fiber glass insulation


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.

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Old 06-03-2009, 08:49 PM   #2
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Use a 2X4 and a very sharp knife.
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Old 06-03-2009, 09:09 PM   #3
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Yup, piece of wood to flatten it down & a sharp utility knife
Take care at each side where the paper is folded over



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Old 06-04-2009, 04:58 AM   #4
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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.)

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Old 06-04-2009, 07:00 AM   #5
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That's the way I cut it. A big ol' shears that looks like it came out of a tent factory.
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Old 06-04-2009, 10:02 AM   #6
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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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Old 06-04-2009, 06:47 PM   #7
 
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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.
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Old 06-04-2009, 06:55 PM   #8
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I've never had a problem with a razor knife



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Old 06-05-2009, 08:57 AM   #9
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Quote:
Originally Posted by Scuba_Dave View Post
Yup, piece of wood to flatten it down & a sharp utility knife
Take care at each side where the paper is folded over
Yup this is the way, a good pair of sissors works real well also
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Old 06-08-2009, 01:08 AM   #10
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Non serrated hedge shears work great, Cuts like butter.
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Old 06-08-2009, 07:58 AM   #11
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still confused here.... are you cutting a full piece at an angle or are you trying to trim an edge?

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Old 06-08-2009, 08:24 AM   #12
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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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Old 06-08-2009, 12:32 PM   #13
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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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