For a cold roof where the insulation such as kooltherm k7 pitched roof board is fixed between the roof joists the roof needs to be ventilated by leaving a 50 mm gap above the insulation to create an air gap which is vented to the outside.
How to insulate a garage roof uk.
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This will prevent condensation forming in the roof.
Flat roofs are harder to insulate through diy and it s recommended that your find a professional to help with installation.
Flat roofs especially with the uk s ever changing weather are prone to pools of water forming on the surface.
Insulating the ceiling of your garage involves the same process as insulating the walls.
Here s my step by step process for how i added insulation to my garage.
With a warm roof the usual process is to split the insulation into two layers.
Measure the height and width between the framing in the ceiling and pre cut the pieces you ll need.
Such water pools pose insulation problems.
To install the insulation overhead you need to staple the pieces to the roof trusses.
Make sure that all of the pieces are the same size so that they fit into the trusses.
How to insulate a garage step by step.
When it comes to insulating a flat roof you can go for two options.
Saint gobain insulation uk celotex and isover celotex.
If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters.
Saint gobain construction products uk limited trading as celotex registered in england.
A cold roof is when your insulation material is fixed between the roof joists.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.
This will help while you re up on the ladder.
Last chance to waterproof your wall.
I wrote a tutorial on how to waterproof and seal your garage walls using drylok.
A warm roof on the other hand has insulation added above the joists with a waterproofing layer added on top.
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Just remember to use thicker r 40 insulation.
How to insulate a garage ceiling.
You should use some foil tape to make sure that the insulation is stable on the roof edges.
In either case you will need to follow the general steps below to insulate your garage roof.
If you didn t do that before you put the frame up you can still do it now although it s going to be.