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Kingspan seconds - foil or no foil

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Kingspan seconds - foil or no foil

Postby RogerS » 20 Mar 2017, 15:05

Guess this is one for Mike. There's £7 + VAT a sheet difference in price and I need 77 sheets!
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Re: Kingspan seconds - foil or no foil

Postby 9fingers » 20 Mar 2017, 15:42

Foil covering is claimed to add to the insulation value where the board faces onto an air gap. When the board is covered on both sides the foil adds no insulation value.
If you are relying on the board to give you a vapour barrier, I believe the foam to be closed cell but a layer of foil and well taped joints would give a certain vapour barrier but so would sheet polythene stapled on and a lot cheaper.
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Re: Kingspan seconds - foil or no foil

Postby Malc2098 » 20 Mar 2017, 15:52

I was lucky to get a pallet of seconds with no foil of an unusual size and thickness for my 'shop build for a really good saving.

I shall be putting them against OSB as the inner barrier. I will be sealing the edges with the WH2 tried and tested expanding foam delivered by a gun.

Not sure if I need an outer barrier. There will be an air gap.
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Re: Kingspan seconds - foil or no foil

Postby Woodster » 20 Mar 2017, 17:20

RogerS wrote:I need 77 sheets!


What are you building, a block of flats? :lol:
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Re: Kingspan seconds - foil or no foil

Postby RogerS » 20 Mar 2017, 17:49

Woodster wrote:
RogerS wrote:I need 77 sheets!


What are you building, a block of flats? :lol:


:D smaller sheets. 220 m2
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Re: Kingspan seconds - foil or no foil

Postby Mike G » 20 Mar 2017, 18:20

Dunno Roger. I've never used or specified anything other than the foil faced jobbies.
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Re: Kingspan seconds - foil or no foil

Postby RogerS » 30 Mar 2017, 05:28

Went for no-foil in the end.
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Re: Kingspan seconds - foil or no foil

Postby meccarroll » 15 Apr 2017, 15:53

RogerS wrote:Went for no-foil in the end.


A thermos flask has silver foil and an air gap and takes ages to loose heat (excellent heat loss resistance) the foil on the sheets does the same thing.

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Re: Kingspan seconds - foil or no foil

Postby Tusses » 15 Apr 2017, 20:56

I've used tesco value kitchen foil and wall paper paste on polystyrene insulation before :D

I was also under the impression it has IR reflective properties
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Re: Kingspan seconds - foil or no foil

Postby RogerS » 16 Apr 2017, 08:09

meccarroll wrote:
RogerS wrote:Went for no-foil in the end.


A thermos flask has silver foil and an air gap and takes ages to loose heat (excellent heat loss resistance) the foil on the sheets does the same thing.

Mark


I think that the vacuum also plays a part.

Foil helps radiated heat loss, I believe, but the foil was much lower priced and I came to the conclusion that sticking in 100mm of Kingspan would be adequate. I know that if you look at the Kingspan site then they have an article that talks about improving the u-value if you use foil...but then it seems to me that they shoot themselves in the foot by saying '...sometimes as much as up to three times..'. Que ?


So many different types of insulation, so difficult to get definitive answers...in the end I think one does ones best within the economics. The only final thought that I have is possibly putting sheets of insulated plasterboard over the inside as the stud will still be in place and I'd prefer not to run the risk of 'seeing' them as it were as their thermal resistance will be different to the Kingspan filled gaps between them. Either that or shove a lot of the now surplus fibreglass insulation behind them. Or some strips of thinner Kingspan...

Slapping on insulated plasterboard is probably the simplest albeit not cheapest solution.
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Re: Kingspan seconds - foil or no foil

Postby RogerS » 17 May 2017, 19:14

Question....best practice says to use a foam gun to fill in the gaps.

But if the gaps are smaller than the nozzle (much smaller) then does one not bother ?

TIA
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Re: Kingspan seconds - foil or no foil

Postby 9fingers » 17 May 2017, 19:28

RogerS wrote:Question....best practice says to use a foam gun to fill in the gaps.

But if the gaps are smaller than the nozzle (much smaller) then does one not bother ?

TIA



It is air flow that would otherwise bypass the insulation that that you want to stop. you can use aluminium tape perhaps or knife in the foam to the gap.

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Re: Kingspan seconds - foil or no foil

Postby Tusses » 17 May 2017, 21:07

could you stuff rockwool in the gaps to prevent cold spots, then tape over to make air tight?
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Re: Kingspan seconds - foil or no foil

Postby RogerS » 17 May 2017, 21:25

Tusses wrote:could you stuff rockwool in the gaps to prevent cold spots, then tape over to make air tight?


We're talking a couple of mm's here.

Bob..surely plasterboard on top achieves the same thing as tape?
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Re: Kingspan seconds - foil or no foil

Postby 9fingers » 17 May 2017, 21:51

RogerS wrote:
Tusses wrote:could you stuff rockwool in the gaps to prevent cold spots, then tape over to make air tight?


We're talking a couple of mm's here.

Bob..surely plasterboard on top achieves the same thing as tape?


As long as the insulation is perfectly flush with the frame everywhere then possibly no need for tape.

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Re: Kingspan seconds - foil or no foil

Postby RogerS » 18 May 2017, 05:00

Ah that makes sense, Bob...I'll go get some.
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