yes another garage insulation thread...

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Hudson1984

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Hi all,

ok, so, stupidly I was suckered into the "i'll be ok" frame of mind with the roasting summer we had. Now i'm friggin freezing in the garage.

Now, a sparky is coming to put in new sockets and switches. some of which will be on my external walls (attached garage)

I'm thinking probably best to insulate those two walls before he comes (next monday!!!)

I do not want to go nuts, just want to take the edge off really and at least make it a heatable space.

So, i'll insulate between the rafters once the sparky has done his thing, then board over the top.

But the walls I need to get done in 1 day so need to do it simply and ideally cheap!

The walls I want to get done are:
1 wall is 6m x 2.4m
1 wall is 3m x 1.4m (it's 2.4m but my workbench is fixed to it, not moving that now)

about an inch thick total would leave me the space I want. Now, do I just get a load of 25mm batton, screw to wall, chuck in some rockwall then cover with plasterboard.

Or

Get some TLB and dot and dab away.

HELLPPP!! really need to get this done ASAP which means I need to order it all now.
 
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Surely dot and dabbed TLB is easiest ? but not necessarily the cheapest
 
yeah agreed.

Managed to get a decent price off my local store (who look after me REALLY well)

so i'll be sticking up some stud, and putting 50mm polystyrene in between, chuck some plasterboard over it all and calling it job done.

Just going to to the back corner for now, least it's part of the job done and will be enough to get the sparky bit finished. Then I can do the rest in a month or two
 
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Leofric said:
Did somebody mention vapour barriers?
Click to expand...

somebody did not. Feel free to chime in though.

To give further info. I've ordered the stud timber, ordered polystyrene insulation and ordered the plasterboard. If I need a vapour barrier then please do give me a shout (and ideally some advice) as to which layer that needs to be applied - i.e. between PB and Insulation/stud or between wall and insulation/stud

do let me know, would rather do this as well as I'm able.
 
Ding, dong merrily on high . Vapour barrier goes on the warm side of the insulation, between plasterboard and insulation. You can use a thin Visqueen sheeting as vapour barrier/check/control layer ,or foil backed plasterboard (Duplex board ) with taped joints.(y)
ps no doubt others will dispute it now :!:
 
awesome cheers for that.

Well I've just got normal boards ordered so aren't foil backed.

So i'll be going:
Wall (which is cold by dry - been painted with masonry paint and shows no discolouring due to damp)
screw on the studs
cut insulation board between the studs
Chuck on the barrier over the whole lot
cover with plaster board.

sit back and hopefully not have as much heat leak out


https://www.screwfix.com/p/capital-valley-plastics-ltd-vapour-barrier-green-300ga-20-x-2-5m/12869 be using this
 
This isn't your specific situation but it shows the jointing arrangements that Visqueen recommend.
 

Attachments

  • VB-02 Timber Frame Standard Detail - Visqueen Vapour Barrier - Cross Section.pdf
    2.6 MB · Views: 191
Christ, layers upon layers....

So I need a vapour barrier on the brick, then my stud, cover that with jointing tape and vapour barrier. the go over the whole thing with vapour tape.
 
Hudson1984 said:
Christ, layers upon layers....

So I need a vapour barrier on the brick, then my stud, cover that with jointing tape and vapour barrier. the go over the whole thing with vapour tape.
Click to expand...
The vapour barrier is to stop hot moist air sneaking around/through your insulation and hitting cold brick and dumping all the moisture there. The reason there's so many on the warm side is to make a solid seal.

Number 4 in that diagram is a breather membrane which is used to slow moisture coming in from the other way, but not block it entirely like a vapour barrier. You don't want vapour barrier on both sides as water will inevitably get in somehow and you want to give it a way to get out.
 
Last edited:
Ah gotcha, so I’ll need a breather membrane direct on the wall, do my stud/insulation, cover that in vapour barrier then plaster board over that? That the case?
 
That sounds right to me, for all that my opinion is worth. :whistle:
 
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