garage insulation

freeflyer

Hi all, so i want to insulate my single skin garage door (it forms part of the house and is underneath other rooms). My problem is fireproofing. Having already learnt that the method i was using was not suitable (polystyrene insulation with a ply board over it) and that celotex and similar no longer certify their insulation for fire,  i'm now looking for answers to the following.

1) Does this garage door insulation actually need to be fireproof?
2) Assuming it does, does anyone know of any cost effective Class 0 or class 1 insulation which would be suitable?
 

Mutton_Geoff

Why do you want to insulate it? To make the garage warmer or the room above?

Robin9

I solved the same problem by replacing my up and over with an electric roller door - well insulated, reduces draughts, noise . Not described as fireproof.

I replaced the garage ceiling -  lots of fibreglass in the joists and a double layer of plasterboard. That met the regs 20+ years ago.

FreeBear

Cork board is fire resistant, but I don't know if it will meet your requirements. Fibreglass & mineral wool would work, but you'd need to be selective about any studwork (metal perhaps). Top off with cement board, and that should reduce the fire risk to a minimum. Unfortunately, you'll need to pretty much double the thickness to achieve the same u-value you would have got with Celotex/Kingspan.

freeflyer

Mutton_Geoff said:

Why do you want to insulate it? To make the garage warmer or the room above?

both.. the logic being that a warmer garage leads to a warmer house overall.

freeflyer

Robin9 said:

I solved the same problem by replacing my up and over with an electric roller door - well insulated, reduces draughts, noise . Not described as fireproof.

I replaced the garage ceiling -  lots of fibreglass in the joists and a double layer of plasterboard. That met the regs 20+ years ago.

perhaps not an option at the moment, as we're doing the rest of the house up and rarely use the garage door itself, so electric door would be money wasted.

freeflyer

FreeBear said:

Cork board is fire resistant, but I don't know if it will meet your requirements. Fibreglass & mineral wool would work, but you'd need to be selective about any studwork (metal perhaps). Top off with cement board, and that should reduce the fire risk to a minimum. Unfortunately, you'll need to pretty much double the thickness to achieve the same u-value you would have got with Celotex/Kingspan.

there's no way the garage door would take the weight of cement board unfortunately..

FreeBear

freeflyer said:

FreeBear said:

Cork board is fire resistant, but I don't know if it will meet your requirements. Fibreglass & mineral wool would work, but you'd need to be selective about any studwork (metal perhaps). Top off with cement board, and that should reduce the fire risk to a minimum. Unfortunately, you'll need to pretty much double the thickness to achieve the same u-value you would have got with Celotex/Kingspan.

there's no way the garage door would take the weight of cement board unfortunately..

Thin aluminium cladding then ?

Nearlyold

Any garage door that opens into an interior space in the house e.g. a Hallway or Kitchen needs to be fire rated to FD30 & self-closing.

I may be mistaken and missed some new legislation but can't find any reference to a garage door that opens to the outside needing to be fire rated. 

We used this to insulate ours https://www.toolstation.com/thermawrap-self-adhesive-garage-door-insulation/p31452?utm_

Of course, it doesn't do much to cut down draughts which is why we eventually upgraded to this Hormann LPU67 Thermo Insulated sectional garage door highly insulated M-Rib L-Rib silkgrain or decograin (arridgegaragedoors.co.uk)

Mutton_Geoff

freeflyer said:

Mutton_Geoff said:

Why do you want to insulate it? To make the garage warmer or the room above?

both.. the logic being that a warmer garage leads to a warmer house overall.

How old is your house? The rooms above and adjacent to the garage should be insulated on the assumption it's cold on the other side of that wall/floor. Draft proofing may help but unless you're going to heat the garage, it's pointless insulating it.