How To Insulate A Garage

How To Insulate A Garage
Posted in: Guides, Insulation

How you view your garage can sometimes depend on your personality. For some, a garage is just a space to park your car, while others tend to renovate their garages to create a usable living space, and to act as an extension of the home.


The issue with garages is that most in the UK are not insulated at all, and consist of breeze blocks with nothing to either retain the heat in the winter or keep the area cool in the summer. If you are looking to insulate your garage, then there are a few things you’ll need to consider. One such factor is whether the garage is attached to the house or if it’s separate.


If it is attached to at least one wall of your home, heat transfer can cause any rooms that are directly attached to the garage wall to lose heat rapidly. This can cause further issues too, such as increasing heating bills.


The steps you need to take to insulate your garage will depend on how it’s made up.


How To Do a Cavity Wall Garage Insulation


If your garage has brick walls surrounding a base of breeze blocks and an air gap of around 50mm, then insulating it is not a simple task. In this case, a specialist will need to be brought in for the job, to inspect the cavity. If the cavity is empty, then the professional can fill in the required insulation via tiny holes drilled into the brickwork.


Unfortunately, this is the only way to properly insulate a cavity wall garage after the initial building stage. The only other thing to consider would be if the breeze blocks are in a poor condition, to which an expert could, in theory, take the breeze blocks down, insulate against the bricks, then build another breeze block structure in its place.


How To Do a Breeze Block Garage Insulation

There are some buildings where the garage is made up of just breeze blocks, which would require a different approach. Unlike the cavity wall garage style, you can do this yourself by following these instructions.


One option to take here is to fit some softwood battens to the inside of the garage wall before filling the spaces with insulation, while applying a damp proof course strip between the batten and the wall to prevent any moisture build up.  Celotex Pl4000 Thermal Insulation Board can then be fixed to the battens using screws, with the heads sitting just below the surface. It can then be decorated over after applying a skim to the surface.


If retaining as much space as possible is important to you, then using a much thinner insulation product may be the way to go. These can often be applied with a strong adhesive rather than nails or screws. Some products can be pasted onto the wall in the style of a classic wallpaper, with a coat of primer underneath.



How To Insulate a Garage Flat Roof

Now that the walls are taken care of, you need to make sure that the garage roof is also insulated properly and thoroughly. If you have a flat roof, which most UK garages do, you have the choice between a warm roof construction (above the roof deck) or a cold roof construction (below the roof deck).


Warm roof constructions allow you to keep all of the current space in your garage, while also keeping the deck construction warm. To start with, make sure the roof is clean and free of any damage. A vapour control layer may also need to be laid down if the area isn’t fully watertight. Insulation boards can then be laid down in a break-bond pattern and bonded to the surface using a strong adhesive.


For cold roof constructions, you’ll need to make sure there is an airgap between the insulation layer and the roof deck to allow any moisture to be ventilated out. Before any other moves, you should screw 50x50mm battens to the side of the rafters below the roof deck, making sure the airgap is maintained. Then, measure your insulation boards and cut them down to size using a saw, to fit between the rafters.


How To Insulate a Garage Floor


The chances are that your garage floor will just be made up of solid concrete. A damp proof membrane can be laid down first before cutting and laying the insulation boards. With solid floor insulation, you can save a lot of money on your energy bills, making it a great long term investment.


Using rigid insulation boards to insulate your garage floor can help make it a lot more inhabitable if you’re undergoing a renovation. After the thin insulation boards have been laid, you can decorate over the top with either underlay and carpet or a timber deck.



 After the garage walls, roof and floor have been insulated, you could also look at adding a thin layer to the garage door, using multifoil or glass wool insulation.


Now that the garage is taken care of, if you are ever in need of any products such as building supplies, Insulation Express can help you with our expert range. If you need any assistance with how to apply roof insulation, check out our insulation guides.

2 months ago
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