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Floor Insulation Space

  • 30-09-2008 7:46pm
    #1
    joewicklow
    Registered Users, Registered Users 2 Posts: 265 ✭✭


    I am building an extension and have 50mm of space left on top of my raft foundation to get to my floor level.
    What insulation should I use, I was thinking 30mm kingspan with a 20mm screed or should I just sacrifice another 50mm of roof height and go for 60mm insulation with a 40mm screed.
    Thanks...
    Tagged:


Comments

  • #2
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    I assume this is a single storey extension. 11 rows of blocks will give you 2475mm plus wallplate. It should be possible to have a ceiling height of at least 2400mm!

    Are you going to have a flat roof or a pitched roof?
    Why can't you raise the wallplate level by a brick height of 75mm?

    If its a pitched roof you might be able to raise the ceiling joist to create a "Collar" roof - depending on span.

    Its a hard question to answer without knowing the full facts. Can you supply more details or answer the questions above?

    In general I'd say the thicker the screed the less likely it is to crack. Given the choice above, I would suggest 60mm and 40mm screed (75mm screed would be alot better)


  • #3
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    use a 75mm soap bar to screed off, giving you 125mm to play with, and increase your spec to 60mm insulation and 65 screed.


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