Step 3 install the insulation.
How to insulate flat garage roof.
The first thing you need to do is choose the type of insulation you are going to use.
This will enable the airflow to circulate freely.
Garage roof insulation guide carefully study the roof for any electrical outlets or any other objects such as lighting.
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.
If there are wooden trusses or frames in the roof you.
Buy fiberglass bats that match the configuration of your roof.
The typical u value of an existing uninsulated flat roof is 1 5w m2k.
Extra tip consult with a professional.
There are two main.
If you have a.
If insulation is being added to an older building then it is common practice for the ceiling itself to be taken down.
A warm roof or a cold roof.
It should be of the maximum available thickness.
How to insulate a garage roof.
A cold roof is when your insulation material is fixed between the roof joists.
For warm flat roofs where insulation is added above the roof joists the first area to check is the condition of the existing waterproofing on the roof.
It is easy to apply and forms a tight seal in all of the gaps.
Step 2 cutting the insulation.
The target should be to achieve a u value of 0 25w m2k or better.
A warm roof on the other hand has insulation added above the joists with a waterproofing layer added on top.
The insulation material is placed between the supporting joists leaving a gap of 50 60mm between the roof and insulation.
One way to do so is by using expanding foam.
When it comes to insulating a flat roof you can go for two options.
As a general rule of thumb.
With a warm roof the usual process is to split the insulation into two layers.
If this is in a good condition then it can just be swept clean and the insulation either mechanically fixed or glued on top of the existing roof.