Rick K Posted March 30 Share Posted March 30 When fitting floor insulation is the added cost of 150mm Kingspan worth it when the saving using 150mm Celotex will be over a £1,000 for the same floor area? Link to comment Share on other sites More sharing options...
nod Posted March 30 Share Posted March 30 No it’s not worth the extra That’s why most of the Builders merchants stock celotex Kingspan is the Hoover of vacuum cleaners Link to comment Share on other sites More sharing options...
JohnMo Posted March 30 Share Posted March 30 Basically the same stuff, different trade names. Buy at the best price, shop around I got mine online came direct from the factory. Prices vary daily so you need to do your legwork to find the best price. But was 70% cheaper than I could get locally. 1 Link to comment Share on other sites More sharing options...
Gone West Posted March 30 Share Posted March 30 We used Recticel as it was the cheapest at the time. Link to comment Share on other sites More sharing options...
dpmiller Posted March 30 Share Posted March 30 If funds are really tight and you can put up with the difference in insulation value, try 100 PIR over 50 EPS. The EPS is a bit more forgiving of the subfloor too... 1 Link to comment Share on other sites More sharing options...
Conor Posted March 30 Share Posted March 30 Don't use 150mm sheets, use 50mm and 100mm. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 30 Share Posted March 30 Have you looked at seconds? https://www.insulationsouthwales.com/ Fill-in the gaps with foam, then tape, use the saved money to put towards a holiday. Link to comment Share on other sites More sharing options...
tuftythesquirrel Posted March 30 Share Posted March 30 What they said above. When I used to phone a merchant and order Celotex, they just hear, that white stuff over in the corner of the yard and delivered Recticel regardless. The thermal conductivity for all the products is very similar in any case. The most important factor is how it is installed – what can be detrimental to the performance is gaps. I did multiple layers of it (because no one stocks it 250mm thick). I filled all joining surfaces with an airtight sealing foam as you would use mortar on blocks and also sealed the top of the joints with foil tape. A bit over the top maybe, but there ain’t no gaps. The biggest saving by far I found was to buy seconds locally. A chap delivered us 2 trailer loads, he said he gets it from the Kingspan factory. It was probably less than half price.😁 Link to comment Share on other sites More sharing options...
Rick K Posted March 30 Author Share Posted March 30 Thanks for the above posts, really useful. Link to comment Share on other sites More sharing options...
Rick K Posted March 30 Author Share Posted March 30 8 hours ago, Conor said: Don't use 150mm sheets, use 50mm and 100mm. Just out of interest, what is the advantage? Link to comment Share on other sites More sharing options...
Conor Posted March 30 Share Posted March 30 (edited) 27 minutes ago, Rick K said: Just out of interest, what is the advantage? Cheaper. Easier to handle. Easier to cut. 50mm on the slab and then 100mm opposite way eliminates any "rocking" issues. Easy to use or sell on leftovers. Edited March 30 by Conor Link to comment Share on other sites More sharing options...
tuftythesquirrel Posted March 30 Share Posted March 30 4 minutes ago, Conor said: Cheaper. Easier to handle. Easier to cut. 50mm on the slab and then 100mm opposite way eliminates any "rocking" issues. Easy to use or sell on leftovers. Yes and the slab is never perfectly flat, so there is more opportunity to correct any undulations going over it twice. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 30 Share Posted March 30 Only 3 things to check really. The k-value, the moisture absorbency and the compression deflection/strength. 1 Link to comment Share on other sites More sharing options...
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