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  1. #1

    cutting insulation triangles ??

    does any one have a fool proof method of cutting insulation into triangles?

    seems like an easy task , but tried some off cuts this morning and its hard work getting them equal over a good distance?
    any ideas please?



  2. #2
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    Ha ha.... the only advice I can give is to try doing it when drunk.

    I've never been able to cut anything straight, ever, but I did surprisingly well making some triangle corner shelves in the garage after a few drinks. Mind you, I did fall off the ladder (trying to catch an out of control drill) and injure my shin.

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  4. #3
    Quote Originally Posted by RS2OOO View Post
    Ha ha.... the only advice I can give is to try doing it when drunk.

    I've never been able to cut anything straight, ever, but I did surprisingly well making some triangle corner shelves in the garage after a few drinks. Mind you, I did fall off the ladder (trying to catch an out of control drill) and injure my shin.
    i knocked a little jig up with some 4x2 , cut some 45 degree wedges and lined them up so u only have to make sure the saw is in line on the top as the gap at the bottom keeps the blade in line , i cut the insulation 100mm into 100mm widths and they aint perfect but they are good enough to go under the fibreglass:

    IMG_20190617_164228.jpg

    IMG_20190617_164307.jpg

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  6. #4
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    Quote Originally Posted by RS2OOO View Post
    Ha ha.... the only advice I can give is to try doing it when drunk.

    I've never been able to cut anything straight, ever, but I did surprisingly well making some triangle corner shelves in the garage after a few drinks. Mind you, I did fall off the ladder (trying to catch an out of control drill) and injure my shin.
    Haha mint few drinks and all seems better hahah

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  8. #5
    Extreme Koi Member Rank = Kyusai Pomster's Avatar
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    Have you thought of using a hot wire with a jig?
    Not to read a newspaper makes you uninformed. But to read a newspaper makes you misinformed

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  10. #6
    i had not heard of them tbf.
    I've cut them now with off cuts of timber i had lying around

  11. #7
    You can get polystyrene 100x100x1500 (or longer/shorter) wedges but the postage is astronomical. I tried with celotex as well and gave up
    I think a table saw and special blade would work (I didn’t have one to try though)


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  13. #8
    Banned Rank = Mature Champion Trace's Avatar
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    For different purposes we've used several jigs like the one above with a long wide bladed bread knife (keeps the blade flat on the jig) but using the blade horizontally along the jig ... we had a couple of different blades ... long wide bread knife with very fine teeth and long thin wide blade kitchen knife (razor sharp) ... the width of the blade is the secret keeps it nice and flat on the jig. Much better than a saw as they are more rigid.

    For some insulation fine teeth are better ... for some sharp blade is better ... you can get suitable knifes at any large bargain store ...

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  15. #9
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    Quote Originally Posted by carlcwc View Post
    i knocked a little jig up with some 4x2 , cut some 45 degree wedges and lined them up so u only have to make sure the saw is in line on the top as the gap at the bottom keeps the blade in line , i cut the insulation 100mm into 100mm widths and they aint perfect but they are good enough to go under the fibreglass:

    IMG_20190617_164228.jpg

    IMG_20190617_164307.jpg

    Fair play, that is ingenious.

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  17. #10
    Quote Originally Posted by RS2OOO View Post
    Fair play, that is ingenious.
    Glad you like it
    thought id show how i did it incase any numpty like me gets stuck in a mind fart with how to do it.
    they aint perfect but they will do the job tbf, I've got a rough rasp to clean the edges up with.

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  19. #11
    Senior Member Rank = Jussai Tom Koi's Avatar
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    Quote Originally Posted by carlcwc View Post
    i knocked a little jig up with some 4x2 , cut some 45 degree wedges and lined them up so u only have to make sure the saw is in line on the top as the gap at the bottom keeps the blade in line , i cut the insulation 100mm into 100mm widths and they aint perfect but they are good enough to go under the fibreglass:

    IMG_20190617_164228.jpg

    IMG_20190617_164307.jpg
    Excellent effort that, fairplay, bit of gentle sanding and jobs a fish

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