Does it really make any difference which PIR insulation board brand?

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d000hg

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I've been basing my budget on brands I know basically Kingspan and Celotex.

For 150mm boards getting prices like £72 (Kingspan Therma Insulation board TP10 TF70), but then I happened to spot unknown (to me) brands like Eco-Therm Eco Versal Insulation Board and Recticel Eurothane GP Insulation Board both for £48. The specs seem virtually identical but that big a difference in price makes me a bit wary.

It's for use in a pitched roof, outside the rafters, but then sheathed with timber boards for shingles (so no breaks). Also for under-floor between the joists - though for the latter I am wondering if wool might be a more price-savvy option?
 
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Class 1 - BS 476-7 seems common to those that list it, including Celotex. As does rigidity/compression load and everything else I can see.
 
d000hg said:
I've been basing my budget on brands I know basically Kingspan and Celotex.

For 150mm boards getting prices like £72 (Kingspan Therma Insulation board TP10 TF70), but then I happened to spot unknown (to me) brands like Eco-Therm Eco Versal Insulation Board and Recticel Eurothane GP Insulation Board both for £48. The specs seem virtually identical but that big a difference in price makes me a bit wary.

It's for use in a pitched roof, outside the rafters, but then sheathed with timber boards for shingles (so no breaks). Also for under-floor between the joists - though for the latter I am wondering if wool might be a more price-savvy option?
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Its all the same stuff.

As you are buying a fair bit, try a main distributor.

Encom insulation
Sig insulation
Seconds and co. -they sell new kingspan


For walls and floor you could consider actis hybris -its quicker to fit between studs than pir.
 
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I'd not come across Hybris, thanks. Can that be cut without damaging the performance?

Thanks for the tip to go direct to the distributor, I'll look into it.
 
d000hg said:
I'd not come across Hybris, thanks. Can that be cut without damaging the performance?

Thanks for the tip to go direct to the distributor, I'll look into it.
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Hybris is not rigid, basically the material is cut up when still rolled to the gap between studs and then it is just pished in place.

It became popular when the BASF fire increased the cost of PIR, but the price has stabalised now and Im not sure if hybris is now too dear. -builders like it for speed of install. No good for rigid applications like flat roofs of course.
 
It looked a bit cheaper but then its performance is not as good. Worth looking into anyway.

I was looking at their TRISO SUPER 10+ stuff but couldn't quite figure it out, no reply from them to my query yet. Is good old fashioned glass-fibre still used where you have a lot of space and don't need super-high performance? I think it gets about .04W/mK as opposed to .02 for PIR?
 
If you need 150 then check the prices of 100+50 as they are the high volume thicknesses and may be a good split.
 
John D v2.0 said:
If you need 150 then check the prices of 100+50 as they are the high volume thicknesses and may be a good split.
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I did notice 150 cost more than 100+50 on one site but figured it was a quirk. I'll keep an eye on that... Thanks
 
Think I used 120mm PIR on my flat roof. Sure I was getting prices of £50+ new, but then discovered seconds. They were a mix of half sheets, some had a duffed edge, but they still do the same job. Got those for £20 or under a sheet.
 
i second seconds. much cheaper and often the defect isnt that noticable by the time its been delivered and stacked a few times and then cut and fitted.
 
I've been looking into this but I'll be honest, I'm not seeing dramatic differences in pricing. Maybe 20% rather than like someone said above.
Any more recommendations where to look?

Do they retain all their certified properties for regs purposes?
 
The recent celotex and kingspan get the good numbers from using propane as the fill gas, in ten years time they will all have the same not quite so good numbers as it will have diffused out by then
 
Mike13 said:
The recent celotex and kingspan get the good numbers from using propane as the fill gas, in ten years time they will all have the same not quite so good numbers as it will have diffused out by then
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Do you have a reference for that?
 
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