New Roof - Metal tile replacement

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CokemonZ

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#257270 23-Sep-2019 11:47

I'm looking at getting a new roof. Our house is 45 odd years old, and has metal tiles, many of which have been stepped on so have cups, and the paint is going/peeling.

I have a quote for colour steel, but one of my concerns is insulation. We don't have a roof cavity, and therefore essentially no roof insulation. The couple of roofing companies I've spoken too said as it's essentially like for like I can just do it. But actually - I want insulation. For aesthetic reasons I don't want to fill in the space between the exposed beams which has been everyones suggestions so far.

I have found this product (https://www.metalcraftgroup.co.nz/products/metal-insulated-panels/) - essentially metal roofing panels with insulation bonded inbetween two layers. I'm thinking these might be a go. The one called metecnospan seems the most logical.

Has anyone seen this/had experience? I've got in touch for a quote, but of course a little worried about being sold to.

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#2323352 23-Sep-2019 13:08

What's between your visible ceiling and the roofing material? I thought there was a gap for ventilation, which suggests insulating way up there might be less effective than you would hope. A picture of your interior showing the exposed beams might make it easier to understand your setup.

elpenguino

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#2323374 23-Sep-2019 13:47

Without a cavity where is the insulation to go?

You must create a cavity, whether that is within, above or below the existing (wooden I presume) roof structure is up to you

I can see the attraction of the sandwich product - but part of the insulation job is to limit air exchange between the indoors and outdoors. Can that be done?

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mattwnz

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#2323392 23-Sep-2019 14:26

This page should help you https://www.energywise.govt.nz/at-home/insulation/ceiling-insulation/insulating-skillion-or-flat-roofs/ . Also speak to your council about it

CokemonZ

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#2323401 23-Sep-2019 14:54

here is a pic from inside. I haven't looked under the roof tiles, but yes, as you say there is likely an air gap making the insulated metal panels a bit redundant.

That's why I asked you smart folks :)

The energy wise site recommends filling the area between the roofing batons. Both my wife and I like the look of them and don't want to fill them in .

timmmay

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#2323406 23-Sep-2019 15:05

I guess your options are accept you have no ceiling insulation or fill in between the battons with insulation, as I don't think insulating under the iron is going to help all that much.

Gurezaemon

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#2323407 23-Sep-2019 15:06

CokemonZ:

here is a pic from inside. I haven't looked under the roof tiles, but yes, as you say there is likely an air gap making the insulated metal panels a bit redundant.

That's why I asked you smart folks :)

The energy wise site recommends filling the area between the roofing batons. Both my wife and I like the look of them and don't want to fill them in .

Are you sure there is no gap?
I have a lounge with exactly the same type of thing. I was sure there was no gap under the roofing iron, until a year ago, I was replacing a piece of it, and there was a layer of pink batts in between the iron and my equivalent of the white sections of your ceiling.

CokemonZ

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#2323408 23-Sep-2019 15:08

Gurezaemon:

CokemonZ:

here is a pic from inside. I haven't looked under the roof tiles, but yes, as you say there is likely an air gap making the insulated metal panels a bit redundant.

That's why I asked you smart folks :)

The energy wise site recommends filling the area between the roofing batons. Both my wife and I like the look of them and don't want to fill them in .

Are you sure there is no gap?
I have a lounge with exactly the same type of thing. I was sure there was no gap under the roofing iron, until a year ago, I was replacing a piece of it, and there was a layer of pink batts in between the iron and my equivalent of the white sections of your ceiling.

If there is, it is minimal. I borrowed an infrared camera a wee while ago and it was super super cold.

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elpenguino

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#2323412 23-Sep-2019 15:22

Feel like creating a under-roof cavity and then put replica beams underneath?

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

CokemonZ

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#2323415 23-Sep-2019 15:29

elpenguino:

Feel like creating a under-roof cavity and then put replica beams underneath?

I am intrigued that there may actually be a gap up there now. I might pull out a tile and have a look. One of the roofing guys didn't think there would be a useful one.

Bung

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#2323417 23-Sep-2019 15:34

You probably have purlins running at right angles to the visible beams. It would depend on whether they were on edge or sides how much gap you'd have. There has to be 25mm min gap between insulation and building paper.

Edit. You can see the purlins showing on one off the panels. Looks like you'd only have a 50mm gap, not really usable.

CokemonZ

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#2323418 23-Sep-2019 15:35

Bung: You probably have purlins running at right angles to the visible beams. It would depend on whether they were on edge or sides how much gap you'd have. There has to be 25mm min gap between insulation and building paper.

ah. so any gap is likely to be between tiles and building paper, and then there might be another gap, but likely not

Technofreak

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#2323500 23-Sep-2019 19:05

CokemonZ:

here is a pic from inside. I haven't looked under the roof tiles, but yes, as you say there is likely an air gap making the insulated metal panels a bit redundant.

That's why I asked you smart folks :)

The energy wise site recommends filling the area between the roofing batons. Both my wife and I like the look of them and don't want to fill them in .

That looks exactly like our ceiling. Our house is a Modulock (similar to a Lockwood) and about the same vintage as yours. There's no room for extra insulation. The only option is to fill in the gaps between the beams and put in a false ceiling - an expensive exercise unfortunately.

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CokemonZ

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#2323551 23-Sep-2019 20:37

Technofreak:

CokemonZ:

here is a pic from inside. I haven't looked under the roof tiles, but yes, as you say there is likely an air gap making the insulated metal panels a bit redundant.

That's why I asked you smart folks :)

The energy wise site recommends filling the area between the roofing batons. Both my wife and I like the look of them and don't want to fill them in .

That looks exactly like our ceiling. Our house is a Modulock (similar to a Lockwood) and about the same vintage as yours. There's no room for extra insulation. The only option is to fill in the gaps between the beams and put in a false ceiling - an expensive exercise unfortunately.

Did you do it? Was it worth it?

Technofreak

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#2323556 23-Sep-2019 21:08

CokemonZ

Did you do it? Was it worth it?

No, we didn't do it. We didn't think it was worth it.

We stuck in a big heat pump instead. That works well.

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CokemonZ

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#2323557 23-Sep-2019 21:17

Technofreak:
CokemonZ

Did you do it? Was it worth it?

No, we didn't do it. We didn't think it was worth it.

We stuck in a big heat pump instead. That works well.

That's what we have now, and it does work. Only looking at this as the roof needs replacing, and it seems a waste not to insulate at the same time.

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