Cold bedroom over garage - how to sort?

Participant

Participant

Participant

Caporegime
Joined
13 May 2003
Posts
34,539
Location
Warwickshire
Hi all

Further to my leaking soil pipe thread, I've decided to rip the garage ceiling out and do a proper job of insulating / sealing it.

We have a master bedroom over a double garage and it's significantly colder than the rest of the house.

The garage has a sectional garage door with what looks like good seals and it closes pretty securely, however three of the four walls are exposed.

There's currently ~15cm of that yellow wool stuff between the plaster board and the bedroom floor.

My question is - what's the absolute Rolls Royce of gold-plated solutions here for a warm and comfy master bedroom?

My current plan is:

- Rip out all existing plaster board and insulation
- Seal holes around pipes etc. with expanding foam
- Fit Rockwool between joists right up to ceiling / bedroom floor
- Fit 50mm Kingspan between joists so that they're flush with the bottom of the joists
- Aluminium tape where Kingspan meets joists
- Board with a single layer of fireboard
- Intumescent mastic between fireboard and garage wall
- Tape, skim, and decorate
- Replace current radiator with the largest that will fit
- New carpet with thick underlay (we are replacing the carpet anyway)

Apart from a warm bedroom, I'm concerned about obeying regs and avoiding any condensation issues with incorrect placement of insulation.

Does the above sound OK?
 
Fit some fit from below ufch spreader plates directly to underside of bedroom floor plus all the insulation for a boost to to the room.
 
Be careful trying to seal up tight a garage door. Garages like being draughty to keep them dry especially if you're driving wet cars in there.
 
You can get insulated sectional doors ,not cheap though and don`t know how much benefit it would be to the bedroom
What heating do you have in the bedroom?Is the rads up to size?maybe change for bigger or double?
 
Participant said:
Didn't quite understand that - are you saying convert the room to under floor heating?
Click to expand...
Just give the room a boost with ufch aswell as rads, which I presume you have.

Single room application using the flow and return from existing heating to feed ufch pipework via a zonal regulation unit.
 
I would put 50mm thick battens below the existing ceiling joists in the garage, which will give you a bigger void/depth between the exsting joists.

50mm or 75mm thick Celotex insulation fixed onto the battens below the ceiling joists/battens within the garage the correct Celotex should come with a vapour barrier already attached to the back of the insulation, then tape the joints to seal it then fix your fireline board to the underside of the insulation.

Once the above is all done put your insulation between the existing joists at first floor level but make sure the insulation is lower that the top of your floor joists (air gap) which will also help too.

Cheers all!
 
if your garage door has no insulation you may want to insulate that as well if buying a new door is too expensive you could have a look at fitting some jablite insulation to it ( B&Q stock it https://www.diy.com/departments/jablite-premium-insulation-board-1200mm-450mm-50mm/26831_BQ.prd).
Most sectional doors have a recess where the jablite boards could easily be fitted into. garage doors at the worst offenders for a cold garage i recently just added nothing but thermawrap to my two garage doors and even though it isnt a perfect solution in my case it helps I aimed a 2kw fan heater at the inside of the door and took temps with an ir thermometer. inside the door temp was 30c plus the outside only 8c
 
I guess for me I would look at root cause analysis. Why is your bedroom cold? Because it is losing heat through your garage? Why is it losing heat? Because your garage is cold. Why is your garage cold? Because it is not heated and loses any residual heat from the house, mainly through an un-insulated door.
So before fixing the insulation in the floor, can you insulate / replace the door with an insulated one. I replaced ours earlier this year with a sectional insulated garage door, and the difference in warmth in both the garage itself and bedroom above is noticeable. After that you may or may not wish to also further insulate the floor void with either celotex and or mineral fibre.
 
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