How To Insulate A Flat Garage Roof

There are a number of factors to take into consideration when installing insulation on a flat roofed garage.

How to insulate a flat garage roof.

Removing and replacing the decking and you can expect the work to take around 7 or 8 hours. Step 1 choose the type of insulation. Flat roofs are harder to insulate through diy and it s recommended that your find a professional to help with installation. They lose loads of heat and are prone to leaking causing the materials to deteriorate.

A warm roof on the other hand has insulation added above the joists with a waterproofing layer added on top. To produce a hot roof rigid insulation is fitted outside above the weatherproofing. This is then covered with a further weatherproofing layer. Garage roof sheets are made from a variety of materials and each material comes with its own benefits so it is important to select the best one for your garage roof.

With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. In either case you will need to follow the general steps below to insulate your garage roof. Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas. Cold roof systems are highly inadvisable as insulation from the inside will inevitably lead to the formation of condensation.

The task of insulating a garage roof is not hard to complete if you follow a few tips and hints. This article will outline these unique features and offer advice to help you put theory into practice. A cold roof is when your insulation material is fixed between the roof joists. A single garage roof without decking will take about 4 hours.

Whatever your reason for installing garage insulation it needs to be done correctly to ensure that you get the maximum benefit from your investment. We are only looking at how to insulate a flat garage roof in detail as this is the most common construction. The u values needed to achieve this on a flat roof are shown below. A double garage flat roof will take a day if you only replace the felt but with the decking too allow a day and a half.

If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof. Here is a guide on how you can insulate the garage roof in a few easy steps.