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PostPosted: Sat Feb 02, 2019 7:19 pm 
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Hi

Does anybody have recommendations for low cost suppliers of 50mm polystyrene insulation board?

Thanks!

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PostPosted: Sun Feb 03, 2019 10:08 am 
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Do you mean something like Kingspan?

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PostPosted: Sun Feb 03, 2019 10:17 am 
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sammy.se wrote:
Does anybody have recommendations for low cost suppliers of 50mm polystyrene insulation board?


Would that not depend on what you call "Low cost" and also how much to get it?

I did find These but it depends on where you are and how much you think is "low cost"

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PostPosted: Sun Feb 03, 2019 10:33 am 
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What quantity and size (length x width) does OP require, and let's be clear, does he mean polystyrene as he says & as s-e has found for him (Wickes do single boards, awful stuff) or does he mean PIR (polyisocyanurate) board as the Kingspan mentioned by J&K (other brands are available*).

Due to the cost of shipping high volume/low weight items, it is generally more cost effective to buy locally.

My local builders merchant stores their PIR (*Xtratherm) in the yard so it is generally damp, smelly and going green on the outside. But they won't do much on the price because they are always maintaining that the product in general (any make) is in short supply & they can't get enough of it.

* & Cellotex is another.



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PostPosted: Sun Feb 03, 2019 10:35 am 
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Sorry if I was too vague. I meant something like this:

https://www.wickes.co.uk/Kay-Metzeler-G ... m/p/210824


£16 felt like a lot for basic polystyrene, so just wondered if anyone knew of cheaper prices.

Not looking for foil type Celotex, just basic polystyrene.

Thanks!!

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PostPosted: Sun Feb 03, 2019 10:36 am 
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30m2 is the amount needed...

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PostPosted: Sun Feb 03, 2019 11:01 am 
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Whereas PIR is best cut with the proper wavy edge knife or sawblade (an old wood saw makes a right mess), one of the best ways to cut polystyrene is with an old kitchen knife, heated up with a blow lamp. Like a hot knife through butter!


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PostPosted: Sun Feb 03, 2019 11:45 am 
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...........Or if you want to be really good, buy some nichrome wire (ebay- less than £2) get an old car battery, make a wooden C shape frame, put the nichrome wire across the C to make it D shape, connect it to the battery and cut away. You can even make "nice shapes"

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PostPosted: Sun Feb 03, 2019 12:40 pm 
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what are you using it for ? if its for insulation Kingspan/celotex is far superior


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PostPosted: Sun Feb 03, 2019 12:50 pm 
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It's for insulation in the loft. The loft floor is already insulated (wool) and boarded, I wanted to plasterboard the rafters, with some insulation behind the plasterboard (but leaving room for airflow around the rafters). I have some stuff in the loft I want to protect from extreme temperatures in summer and winter.

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PostPosted: Sun Feb 03, 2019 3:45 pm 
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I'm with Bob, PIR is far superior to EPS, albeit more expensive. Neater, easier and less messy when done correctly, and you may not need to p/board over (depending on standard of finish required)..

For instance, this page suggests that 50mm of PIR would provide the same insulation as 75mm of EPS. Very importantly, to my mind, unlike EPS it will not melt or drip hot molten globs in the event of fire.



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