Dansow Posted May 21 Share Posted May 21 Hi can anyone recommend a u value calculator for a insulated timber studding inside solid stone walls please? Link to comment Share on other sites More sharing options...
SteamyTea Posted May 21 Share Posted May 21 1 minute ago, Dansow said: Hi can anyone recommend a u value calculator for a insulated timber studding inside solid stone walls please? You really need to go back to first principles. Find out the timber type (probably a pine), the lengths, probably 0.15 to 0.2m, and the total area that will be covered. Then find the thermal conductivity of the timber, somewhere between 0.14 and 0.22 W.m-1.K-1 depending on grain orientation. Then convert to a U-Value. W.m-2.K-1 = 1 / (length / thermal conductivity). Link to comment Share on other sites More sharing options...
saveasteading Posted May 21 Share Posted May 21 1 hour ago, Dansow said: a u value calculator for a insulated timber studding inside solid stone walls please? It's really quite complicated but worth studying so that you can make the best decisions. We have been converting a farm building with 600mm stone walls, then a timber 'tent' inside. We have u values to match new-build. The stone wall has a decent figure itself, confirmed in studies, that the standard calculators wont acknowledge, so we diy-ed it. Or find any calculator and say the external wall is 1 brick (225mm) thick, and that will be a start. Link to comment Share on other sites More sharing options...
SteamyTea Posted May 21 Share Posted May 21 Link to comment Share on other sites More sharing options...
Dansow Posted May 21 Author Share Posted May 21 (edited) saveasteading What was your makeup inside? Edited May 21 by Dansow Link to comment Share on other sites More sharing options...
JohnMo Posted May 21 Share Posted May 21 30 minutes ago, Dansow said: saveasteading What was your makeup inside? If you type @ and immediately after start typing sav... you will get name appear below, select from the drop down and the saveasteading will be notified of your reply Link to comment Share on other sites More sharing options...
Alan Ambrose Posted May 21 Share Posted May 21 Ubakus.de Link to comment Share on other sites More sharing options...
saveasteading Posted May 22 Share Posted May 22 10 hours ago, Dansow said: saveasteading What was your makeup inside? @DansowI'm up on a mewp, surveying the next project today. Will respond later. Link to comment Share on other sites More sharing options...
saveasteading Posted May 22 Share Posted May 22 @Dansow 600mm stone wall , 100 years old, (in 3 layers.) nominally 25mm gap but varies dramatically. so lets say minimum 50mm timber stud wall with fancy vapour barrier on outer face and poly barrier on inner face, void filled with part rockwool and part pir. or all pir. 2 layers is much easier and more accurate then 1. 25mm service gap. plasterboard. optional additional insulation on the inner face to get any U value you want. Link to comment Share on other sites More sharing options...
Dansow Posted May 23 Author Share Posted May 23 @saveasteading Thank you Link to comment Share on other sites More sharing options...
CAJ Posted June 4 Share Posted June 4 Hi Dansow, We put together a material summary and calculation guide and worked example for R-Values and U-Values on the page linked below: https://www.insulationadvice.co.uk/ti-r-values This should hopefully be of help! Link to comment Share on other sites More sharing options...
SteamyTea Posted June 5 Share Posted June 5 Once the U-value is established, then we can discuss condensation points. Link to comment Share on other sites More sharing options...
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