Single skin detached garage insulation & flooring

Discussion in 'Builders' Talk' started by rgsfcomm, Jun 19, 2022.

  1. rgsfcomm

    rgsfcomm New Member

    I'd like to insulate my (concrete) garage floor. It's single skinned so I will seal the concrete (1st coat sealant, 2nd coat sealant + SBR). I will then use tanking slurry on the walls (1st coat slurry + SBR, 2nd coat just slurry). I expect a little slurry left over so I will use that to re-coat the floor (3rd coat). I expect that would take care of any moisture coming in.

    I then want to insulate the floor, but what are my options, assuming it's even worth it? This is the floor plan:


    My garage is 3.14m x 5.95m so I believe my PA ratio (permiter / area, or ((3.140+5.953)*2)/(3.140*5.953), is 0.97. That means to get a U value of 0.22 I will need 100mm of insulation. I have 250mm from concrete to door level. I can probably push it to 300mm (that being the final floor level).

    Firstly, is it even worth it? I plan to live here for the next 20+ years and I just want the floor to not be freezing in the winter. I will insulate the walls and roof, and have a heat source in the garage. Should I even bother with the building-regulation level of insulation?

    Secondly, if it's worth insulating it, what are my options? I believe I need insulation then some sort of structural board on top (I'm leaning towards plasterboard to keep it thin), and cover it with vinyl or some-such material.

    Any ideas and recommendations welcome.
  2. rgsfcomm

    rgsfcomm New Member

    Sorry - I have 25mm to work with, not 250mm.

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