New Roof - Metal tile replacement

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Bung

6489 posts

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#2323573 23-Sep-2019 21:46

You can get rigid insulation bonded to plasterboard that could be stuck to the existing ceiling and at 80mm thickness gives R3.6 . That would still give you most of your exposed beams. Fibreglass batts would need to be about 190mm for same result.

CokemonZ

1051 posts

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#2323653 24-Sep-2019 07:40

Bung: You can get rigid insulation bonded to plasterboard that could be stuck to the existing ceiling and at 80mm thickness gives R3.6 . That would still give you most of your exposed beams. Fibreglass batts would need to be about 190mm for same result.

That's a cool idea. Any ideas where to look before I hit google?

elpenguino

3424 posts

Uber Geek

#2323712 24-Sep-2019 09:34

CokemonZ:
Bung: You can get rigid insulation bonded to plasterboard that could be stuck to the existing ceiling and at 80mm thickness gives R3.6 . That would still give you most of your exposed beams. Fibreglass batts would need to be about 190mm for same result.

That's a cool idea. Any ideas where to look before I hit google?

If considering a rigid insulation remember you'll need to do something to cover the edges where the insulation meets your beams.

Or not, depending on the look you're after :-)

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

mdf

3516 posts

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#2323720 24-Sep-2019 09:54

CokemonZ:
Bung: You can get rigid insulation bonded to plasterboard that could be stuck to the existing ceiling and at 80mm thickness gives R3.6 . That would still give you most of your exposed beams. Fibreglass batts would need to be about 190mm for same result.

That's a cool idea. Any ideas where to look before I hit google?

Google "pir board". It's not super common here in my experience, but becoming more common.

PolicyGuy

1727 posts

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#2323739 24-Sep-2019 10:19

Kingspan Kooltherm insulation board (https://www.kingspan.com/nz/en-nz/products/insulation/kooltherm-insulation-boards) is another product that you might be able to use.
Some types (K17 & K18) seem like they would be suitable to go in between the exposed rafters and would still leave at least half exposed.
Others may be able to go on the exterior side, and as they are between 25mm and 40mm thick, may suit your small clearances

Good luck!

CokemonZ

1051 posts

Uber Geek

#2323766 24-Sep-2019 10:52

PolicyGuy:

Kingspan Kooltherm insulation board (https://www.kingspan.com/nz/en-nz/products/insulation/kooltherm-insulation-boards) is another product that you might be able to use.
Some types (K17 & K18) seem like they would be suitable to go in between the exposed rafters and would still leave at least half exposed.
Others may be able to go on the exterior side, and as they are between 25mm and 40mm thick, may suit your small clearances

Good luck!

Actually, this looks great. I am wondering if once the roof is off a layer of this stuff can go straight down.

I'm going to have a chat with my builder.

rosh

3 posts

Wannabe Geek

#2324637 25-Sep-2019 15:41

here's what we did.

in the peak of the summer, aligned the roofers. they took off the old iron metal roof and chucked in the insulation. then put on the new roof long run color steel.

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