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  1. #1
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    2,890

    Default How do you cut sound insulation neatly

    DIY going wrong here.

    Replacing my engine hatch sound proofing. Started cutting the first foam panel and made a complete hash of it. Stanley blade too short and also tears the closed cell foam. Scalpel blades too flexible and dont make a straight cut. Insulation cutting knife causes the rubber? plastic? polymeric layer to tear unevenly. Gave up in disgust before I ruined another sheet.

    What did you use to make a clean cut?



    https://www.asap-supplies.com/soundp...roducts-801434

  2. #2
    Join Date
    Sep 2005
    Location
    Brighton/Antibes
    Posts
    8,282

    Default Re: How do you cut sound insulation neatly

    Bread knife?

  3. #3
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    2,890

    Default Re: How do you cut sound insulation neatly

    I'll give that a go.

  4. #4
    Join Date
    Nov 2013
    Location
    Sheffield
    Posts
    49

    Default Re: How do you cut sound insulation neatly

    Also try electric meat knife with the fine blade in works a treat on foam

  5. #5
    Join Date
    Jan 2011
    Location
    Weymouth/Haslar
    Posts
    442

    Default Re: How do you cut sound insulation neatly

    I used a serrated bread knife on exactly the same material. Mark it up and cut holding knife at right angles to sheet.
    I found the foil tended to de-laminate and had to be re-stuck.
    Broom owners club..... www.broomowners.com

  6. #6
    Join Date
    Jun 2005
    Location
    Mid Devon
    Posts
    6,135

    Default Re: How do you cut sound insulation neatly

    Electric carving knife or fine blade in jigsaw.
    Brexit: Taking back our freedom as a sovereign nation.

  7. #7
    Join Date
    Oct 2016
    Location
    UK
    Posts
    488

    Default Re: How do you cut sound insulation neatly

    I only found one way to cut it neatly and that’s with a bandsaw.

  8. #8
    Join Date
    Mar 2013
    Location
    boat conwy
    Posts
    2,528

    Default Re: How do you cut sound insulation neatly

    buy a flybridge

  9. #9
    Join Date
    Mar 2015
    Location
    Isle of Eigg
    Posts
    6,093

    Default Re: How do you cut sound insulation neatly

    If you use a knife then you must make many shallow cuts.
    Or score the foil then use a wood saw (combined rip and cross cut), ok it makes a bit of a mess (on the floor) but does the job.

  10. #10
    Join Date
    Jan 2016
    Location
    Ipswich & Southwold
    Posts
    957

    Default Re: How do you cut sound insulation neatly

    We normally use a bandsaw as this doesn’t do an “upcut”. I have successfully used a scalloped breadknife and also hacksaw blade, only cutting on the cut stroke then not dragging back.
    Electrics & electronics Suffolk & Southwold Boatyard
    Custom Panels + Eberspacher/Webasto

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