Garden room - timber frame insulated floor construction

Discussion in 'Carpenters' Talk' started by alf90220, Jul 16, 2018.

  1. alf90220

    alf90220 New Member

    I am planning to build a garden room/man-cave 3x7 meters. The constructions will be timberframe fully insulated so it can be used in the winter time as well.

    To build the base I will dig 10 concrete posts with a 4x4 treated graded beam across them. On that I will lay 4x2 timber frame with 18 mm plywoood covering the top and 10cm celotex and vapour barrier underneath it.

    My question is how to protect the celotex floor insulation from critters (mouse, rats etc.)
  2. Dr Bodgit

    Dr Bodgit Super Member

    I haven't any protection to the underside of the PIR in my man cave floor, didn't even think about it. It does sit a wee way above the ground however.

    I would say 100mm is overkill, I used 50mm which should be more than enough in both floor and roof.
  3. AlvyChippy

    AlvyChippy Active Member

    Floor 50 is fine, walls, ceiling... Acceptable, but for what it's worth, I'd go at least 75mm, leaving 1"gap for a breather
  4. alf90220

    alf90220 New Member

    75mm seems reasonable
    Would you still put a vapor barrier?
  5. AlvyChippy

    AlvyChippy Active Member

    Normal celotex is already protected from everything in either foil or fabric like coat.
    The only real worry- UV from direct light.

    Creatures etc... All the gaps filled up with foam- great insulation not just for the temperature, also sound, vibrations etc
  6. AlvyChippy

    AlvyChippy Active Member

    Must do (walls and ceiling), floor- no probs- no need ;)

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice