Insulating integral garage ceiling

shopndrop

We have a flat plasterboard ceiling in the garage which is directly under our bedroom. Whilst there is insulation under the floorboards the room is still cold so we are thinking about putting the space blanket type of insulation on the garage ceiling but don't know how to go about fixing it. Have thought about stapling it up but not sure if this will hold the weight even if the fixings went through the plasterboard and into the joists. Has anyone done anything like this and got any suggestions for the best way of tackling this?

latecomer

If the plasterboard is just screwed up then take it down and put the insulation in. If not then you could get some of the polystyrene board and fix that onto the underside.

TimBuckTeeth

As mentioned a rigid foam or polystyrene would be easier to fix.
Otherwise if you wish to fit a false ceiling then fit wooden battens to the joists, fit the insulation between using string or staples to hold it up temporarily then fix new plasterboard to the battens.

ormus

if youre prepared to loose some height in the garage then fit your insulation with say hardboard (cheap) too. then use a nail gun or screw into the whole lot.
pencil mark the joist lines first.
other wise remove the PB and replace after installing the insulation.

dianasnan

Please check that you actually have plasterboard and not asbestos before doing any drilling. We have an integral garage and the ceiling is asbestos as a fire break between the garage and our bedroom. House built in 1970's.

maninthestreet

dianasnan wrote: »

Please check that you actually have plasterboard and not asbestos before doing any drilling. We have an integral garage and the ceiling is asbestos as a fire break between the garage and our bedroom. House built in 1970's.

how do you tell the difference???

shopndrop

dianasnan wrote: »

Please check that you actually have plasterboard and not asbestos before doing any drilling. We have an integral garage and the ceiling is asbestos as a fire break between the garage and our bedroom. House built in 1970's.

It is a fairly new property (less than 10 years old) so we are quite sure it is plasterboard and not asbestos.

pugmanic

I would have thought that insulating your ceiling & walls will make a larger difference. You won't be loosing much heat through the floor, though without proper insulation you will be loosing heat through the roof (heat rises ). I expect if you get a ladder out you will find that the Garage Ceiling isn't that warm to the touch in comparison you your bedroom ceiling.

Browntoa

the garage ceiling is designed as a firebreak and should not be drilled, I'd check with the local council planning about what you can do in the way of additional insulation without compromising the safety of the whole thing

the garage ceiling has 2 layers of 12mm plaster board staggered joints and some have 120mm of celotex between joists ,not not sure if the celotex is for insulation or fire resistance

dave08

It wouldn't be asbestos if its not old.

Have a look here for insulation help. Might be useful.

27col

You will get more benefit by making sure that your roof insulation is really at a good level. At least 250-270 mm. Plus it will be much cheaper and easier to fit. If there is a problem after that then possibly it might be worth while doing something about the garage ceiling.