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Small garden room

Discussion in 'Your Projects' started by focaltucker, 4 Aug 2019.

  1. focaltucker

    focaltucker

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    Hi
    I am building a small garden room. 3m x 3m by 2.5 high with a pitched roof.

    I have built the based from 5x2 joists and sat it on levelled dense blocks. I am insulating with kingspan.

    I am after some advice about the wall insulation and ideas for roof construction.

    What's the most cost effective way to insulate between the stud walls?

    I am using 3x2 stud, 11mm osb, vapour barrier, battens then exterior cladding.

    With the roof, I have no idea what to do. I want something lightweight, not too expensive but maintenance free? Any thoughts?
     
  2. Notch7

    Notch7

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    50mm PIR insulation between the studs I reckon.

    Cut it 8 to 10 mm narrow, put a screw or 2 to hold it in place, then use a foam gun all round (a proper metal foam gun that can be turned right down).

    The foam once set will make a complete seal and make the structure surprisingly rigid.

    set it flush to the outside leaving a service gap on the inside.....
     
  3. focaltucker

    focaltucker

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    Thanks. I wasn't sure to go down that route or 75mm cavity slab.

    I using a foam gun on the floor in the same way.

    Interesting though is I had assumed 25mm air gap would go on the outside between pir and osb board.

    So you'd suggest that was on the inside?
     
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