kooltherm v xtratherm

mise_mise

hi... Is there any difference between kooltherm and xtratherm sheets? Planning on putting in xtratherm 50mm + 12.5mm plasterboard. I was told recently that kooltherm do a 40mm insulation and 9mm plasterboard thermal liner which has a better u-value. Anyone else hear about this?

justflow1983

All of these companies publish data sheets that tell you all about U-values, thermal conductivity etc. You should be able to pull it off their websites. Is this for new build or a refurb?

mise_mise

new build

justflow1983

Ok well in that case, make sure you have 2x more insulation on the outside than you do drylining the inside. Otherwise you have cold bridge risks where your interior partitions meet your exterior walls, as well as condensation risk at the contact point between your exterior wall and the insulation.

For Xtratherm,see page 3 here http://www.ribaproductselector.com/Docs/0/20560/external/COL1320560.pdf?ac= to see the U-values of their drylining products as well as the recommended buildup (see the insulation on both sides)

The equivalent chart for kooltherm is on page 5 here http://www.insulation.kingspan.com/uk/pdf/k18.pdf

justflow1983

I have to stress that one of the following, mounted to the exterior face of a single-leaf wall, is a much better use of of your money. You will get much better performance and have a much lower risk of dampness, mould, and moisture problems in the future:
http://www.insulation.kingspan.com/uk/tw53.htm

If you really want a cavity wall, use something like the following system:
http://www.xtratherm.com/products/literature/thinrcloserirl.pdf
http://www.xtratherm.com/products/literature/thinrcplusirl.pdf
http://www.insulation.kingspan.com/uk/k8.htm

The drylining systems you mentioned would still be good to use with one of the above systems. I would not use them on their own, its just a half-assed way to do it and since its a new build you may as well build it right rather than going about it backwards.

sinnerboy

Be careful about PIR's and external wall insulation ( EWI) .

As far as I know not one EWI system supplier includes PIR in their IAB certification

One did untill March 09 when the NSAI amended that companies certificate to exclude PIR

Check here first

http://www.nsai.ie/Our-Services/Certification/Agrement-Certification/Search-Agrements-Certificates.aspx

justflow1983

for the OP PIR=Proprietary Insulated Render. Very good to know, I hadn't checked that they didn't have the certs.

My preferred way would be to actually use a regular cavity insulation, and then battens + a render backer and render onto that. Or use some other type of cladding, but in Ireland it seems to be a hassle to get something like Aluminium or cement fibre through planning.

sydthebeat

justflow1983 wrote: »

for the OP PIR=Proprietary Insulated Render. .

justflow...

PIR = Polyisocyranuate

justflow1983

:rolleyes: wow..... so much for clarity there.....:rolleyes:

sydthebeat

justflow1983 wrote: »

:rolleyes: wow..... so much for clarity there.....:rolleyes:

edited: clarified

justflow1983

I posted that because I made the whole thing really confusing by misreading sinnerboys post. I was making fun of myself.

sydthebeat

justflow1983 wrote: »

I posted that because I made the whole thing really confusing by misreading sinnerboys post. I was making fun of myself.

i apologies for taking you up wrong....

ill edit my previous post...

ardara1

sinnerboy wrote: »

Be careful about PIR's and external wall insulation ( EWI) .

As far as I know not one EWI system supplier includes PIR in their IAB certification

One did untill March 09 when the NSAI amended that companies certificate to exclude PIR

Check here first

http://www.nsai.ie/Our-Services/Certification/Agrement-Certification/Search-Agrements-Certificates.aspx

Yoou mean Phenolic SB - Not PIR

clogher71

The Kooltherm 52.5 is pricey. I think it is a higher spec than the Kingspan tw56, which is more in line with the Xtratherm board. 10% more efficent the Kingspan Technical Department claims. Its about E12-E15+vat per board more than a tw56 board.

sinnerboy

ardara1 wrote: »

Yoou mean Phenolic SB - Not PIR

true

clogher71

Mise, did you do anymore reserch? the kooltherm board 40+9.5 is a K16 board. Going to try get a price for them from a local unfriendly builder providers next week. last week the xtratherm was E4.oo/per board + vat cheaper than the kingspan tw56 in 52.5mm

recedite

The kingspan K range of phenolic foam superseded the T range of PIR in 2008 with U values down to 0.022 from previous 0.0225

The O.P. probably refers to Xtratherm Xtb range, manufactured with CFC gas bubbles, which gets it down to 0.019.:cool: