Additionally the usual u value requirement for floors in conversion projects is 0 25 w m2k.
Garage conversion floor insulation thickness.
C a timber stud with insulation could also be provided with screed floor see diagram 8.
The floor can be finished with a layer of screed or a timber covering floating floor the exact specification of which will depend on the insulation material used beneath.
Celotex ga4000 is our recommend board for use in a ground floor application such as this.
Before starting planning the conversion it is important to check what the existing construction of the garage is as the type and thickness of insulation you use will depend on this.
You will need 2 layers of dpm in the floor one under the insulation and then one on top before your floor sheets go down.
My understanding is that at minimum you can expect to add 100mm to the height either via a screed 50mm insulation 50mm or floating floor 50mm insulation 22mm chipboard.
The question is what to do about insulating the ground.
In order to calculate the thickness we will require the exposed floor perimeter and the floor area.
This is for a garage conversion that will not be heated.
Overlap the seams about 6 to 8 inches and seal the seams with waterproof construction tape.
Run the polyethylene up the sides of the walls 3 to 4 inches and secure to the walls with construction tape.
A warm roof on the other hand has insulation added above the joists with a waterproofing layer added on top.
Sometimes building control have a guideline brochure for garage conversions so have a look it may make your job a lot easier.
A screed is likely to need to be in the order of 75mm thick and should include a reinforcement mesh to prevent it cracking.
They will also expect taping of the joints in the celotex in the stud walls.
That s right even your floor needs insulating.
I hope i have helped.
If there is a step up from the garage into the main part of the house assuming that the garage isn t detached then the insulation and new floor build up can be added to make the new rooms at the same height to the rest of the house.
Flat roofs are harder to insulate through diy and it s recommended that your find a professional to help with installation.
The first thing to check is the construction of the wall as next time we will look at the best methods of insulating them.
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