knauf space board insulation, on top of chipboard??

hi, i have 100mm of loft insulation down at present.
then a third is chipboarded over for storage.
question is can space board go on top of chipboard at all and still insulate well.
other option is to take all the chipboard up and just recover all the loft with 170mm thick insulation.
i dont use the loft for storage, the chipboard was already down when i moved in.
seen as spaceboard is expensive should i just remove chipboard and put new 170mm insulation on top of the existing insulation??

p.s ive seen the npower offer already - cant seem to order though, either by phone or internet??


  • Kiran
    Kiran Posts: 1,370 Forumite
    First Post First Anniversary
    Yes on both counts really. Spaceboards can go over the existing boarding, its one of their selling points I believe. You are also correct, about puttung down a further 170mm being a better option as building regs do not recongnise all the different types of insulation you can use and certainly not used in combinations of types.

    It should also be cheaper and easier to do.

    Some people don't exaggerate........... They just remember big!
  • andrew-b
    andrew-b Posts: 2,413 Forumite
    First Anniversary
    If i were you i'd leave the chipboard down and chuck the 170mm insulation on top. The chipboard in between will make little difference. Got a similar issue to decide myself when i finally get to laying our insulation but we actually use that area for storage. I might jack the boarded area up on extra timbers though. The knauf board looks good but it is pretty expensive stuff.

  • allan673
    allan673 Posts: 1,213 Forumite
    First Post First Anniversary Combo Breaker
    i agree it is expensive isnt it.
    might take most of the chipboard up and just have a small area for storage should i need it.
  • 27col
    27col Posts: 6,554 Forumite
    I it was mine, I would be taking the chipboard up. Provided it was not too firmly fixed. The then lay the 170mm. Much cheaper then space board, especially if you do not want the space for storage.
    I can afford anything that I want.
    Just so long as I don't want much.
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