1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Expensive Kingspan wall insulation vs cheap expanded polystyrene

Discussion in 'Building' started by dominoman, 21 Oct 2015.

  1. dominoman

    dominoman

    Joined:
    10 Jun 2014
    Messages:
    341
    Thanks Received:
    23
    Location:
    London
    Country:
    United Kingdom
    I have a loft room built many years ago that has no insulation at all. It gets very cold in winter.

    To insulate I was thinking to place solid insulation boards between the vertical beams (if that's the right word). Should I pay full price?

    There's an enormous price difference between the cheaper polystyrene boards, and the expensive Kingspan/Cellotex type boards. As it's a DIY job is it really worth the extra money. I'm not doing it for Building regs or the like, it's just to keep some more heat in.

    Thanks for any views...
     
  2. jeds

    jeds

    Joined:
    16 Apr 2004
    Messages:
    4,749
    Thanks Received:
    641
    Country:
    United Kingdom
    Kingspan PIR boards are usually about double the thermal value of poly boards. Maybe more, it depends on the type of polystyrene. So you'd need 150mm of polystyrene to give you the same as 75mm of Kingspan.
     
  3. Sponsored Links
  4. Burnerman

    Burnerman

    Joined:
    7 Feb 2008
    Messages:
    23,219
    Thanks Received:
    4,509
    Location:
    Northumberland
    Country:
    United Kingdom
    I'm paying around £30 for an 8x4 sheet of Kinspan equivalent, at 70mm thick. Foil backed, cuts and snaps with a Stanley knife.....thats my choice!
    John :)
     
  5. cjard

    cjard

    Joined:
    6 Sep 2008
    Messages:
    2,335
    Thanks Received:
    251
    Country:
    United Kingdom
    Were I you I'd check ebay for self builders looking to offload overspill. While collecting 18 rolls of acoustic wool off a guy from Cheshire at the weekend, he offered me 70mm kingspan boards at 15quid each. Alas, I didn't have a use for them so I declined, but they were a bargain. Also if this is in a loft and not requiring perfection getting the right seconds will be cheaper than polystyrene (when blinding ny floor level it turned out cheaper to use kingspan seconds than sand for building up)
     
  6. Sponsored Links
  7. dominoman

    dominoman

    Joined:
    10 Jun 2014
    Messages:
    341
    Thanks Received:
    23
    Location:
    London
    Country:
    United Kingdom
    Great idea cjard. I'll take a look on preloved and my local facebook group
     
  8. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page