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Garage insulation advice please

  • 15-06-2017 7:13pm
    #1
    trackerman
    Registered Users, Registered Users 2 Posts: 519 ✭✭✭


    Hello forum,

    I have a 13' x 8' (inside dimensions) breeze block garage with apex slate roof.
    It's got a double glazed window and double glzed timber door.

    I want to make it into a man-cave / workshop with decent insulation so I can use it on winter evenings... so need to insulate it.
    It's wired for power already.

    Roof rafters are 4"x2" with 15" spacing and I can see the roofing felt.
    Internal walls are bare block with damp course laid at ground level.
    Floor is floating raft of concrete, about 1ft deep and no insulation.

    I want to insulate the roof into the apex so I can have the maximum internal space.
    I also want to insulate walls and floor.
    The floor insulation can't be more than 4cm total including floor covering because the door opens inward.

    What are my options please?

    I was considering...

    75mm Xtratherm for the roof - to leave 1" air gap between tile and insulation.

    52mm insulated plasterboard for the walls.

    10mm thermal board with Lino covering the floor.

    but this comes to about €600 in materials alone...
    Can anyone recommend an alternative/cheaper approach?

    Thanks a million folks.

    Ray


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