Garage door / insulation advice please

Hi,

Our house was built about 20 years ago, we have lived here for 5 years. The house is a four bed detached with an integral garage and the fourth bedroom built directly above the garage.
The bedroom gets noticeably cooler than the rest of the house (to be fair, the room gets warm enough when the heating is on but it rapidly cools down once the heating is off).

When we first moved in I sealed all the visible gaps around the perimeter of the bedroom (between floor and skirting) and also put foam sealant in the garage on the wall/ceiling join.

I don't unfortunatley have any information about the level of insulation that exists under the bedroom floor, I assume that it would be the minimum the house builder could get away with.

The garage door is a standard metal up and over type ( I did attach some foil insulation to the inside face of the door but not really convinced it made much difference).

The garage as I say is integral so one side of the garage borders the hallway/stairs, the back wall borders the kitchen/utility leaving only one side and the front with garage door exposed.
There is no window and no further access door to the garage other than the up and over one.
I want to replace the door  with an automatic one and feel that if I am doing that anyway I 
may as well spend big and get a decent insulated sectional door ( I am thinking of Hormann LPU67 Thermal).

Just wondered if anyone had any experience of these doors and if the benefits are obvious?

My other option I suppose is to rip out the bedroom floor and/or garage ceiling to install further insulation but in all honesty I would rather avoid the inconvenience and mess if replacing the door as suggested would give a reasonable benefit.

Thanks in advance

Comments

  • silvercar
    silvercar Posts: 46,732
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    You aren't heating the garage, even if you are insulating the door, so it is always going to be a lot cooler than the room above. My gut feel is that insulating the bedroom floor keeps heat in the bedroom, whereas insulating the garage door keeps the heating transferred from the bedroom in the garage rather than allowing it to escape. So keeping the garage at say a few degrees warmer than it would be by not insulating the garage door, still maintains a large heat difference with the room above and won't make that much difference to the room above. If you want to keep heat in the bedroom then insulating the floor would be best. I would do it from the garage, far less messy than lifting floor boards etc.
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  • FreeBear
    FreeBear Posts: 14,246
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    rubble2 said: My other option I suppose is to rip out the bedroom floor and/or garage ceiling to install further insulation but in all honesty I would rather avoid the inconvenience and mess if replacing the door as suggested would give a reasonable benefit.
    Garage doors will always be draughty, some better than others.. I'd go for lifting the floor and insulating between the joists rather than ripping the ceiling down in the garage - That ceiling is likely to be cement board to act as a barrier in case of a fire. For that reason, I'd also avoid using polystyrene or PUR/PIR to overboard the ceiling from inside the garage.

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  • mexican_dave
    mexican_dave Posts: 244
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    The garage ceiling should be a fire-barrier with double layer 15mm plasterboard (or cement board) but putting a flammable insulated board up against that seems to be pushing the fire resistance to it's limit! So yes, either take up the bedroom floor and insulate between the beams.
  • Mr.Generous
    Mr.Generous Posts: 3,257
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    The garage ceiling should be a fire-barrier with double layer 15mm plasterboard (or cement board) but putting a flammable insulated board up against that seems to be pushing the fire resistance to it's limit! So yes, either take up the bedroom floor and insulate between the beams.

    My neighbor took the bedroom floor up (because it was uneven) in these exact circumstances, ie over the garage. No insulation whatsoever under the floor. He stuck some loft rockwool stuff in and said its a vast improvement. Big job though. 
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