Big Jimbo Posted May 23, 2023 Share Posted May 23, 2023 I have been trying for a while to calculate my potential U value for the floor. block and beam, but with 2 x 100mm PIR , 75mm screed. I cant get any of the online ones i can find that will let me go above 150mm floor insulation. 150 will give me a U value of 0.13, but i am just trying to find out how much better 200mm would be. Any ideas. Thanks in advance. Link to comment Share on other sites More sharing options...
Redbeard Posted May 23, 2023 Share Posted May 23, 2023 The insulation alone will give you an R value of 9.0909m2K/W (U of 0.11W/m2K). You could do a perimeter/area calc to estimater the 'base case' U value of the un-insulated floor. Add the reciprocal of that to the R value for the 200 PIR and you have a reasonable estimate of the complete 'structure and insulation' U value. 1 Link to comment Share on other sites More sharing options...
Big Jimbo Posted May 23, 2023 Author Share Posted May 23, 2023 Thank you @Redbeard my perimiter calc is .299 Link to comment Share on other sites More sharing options...
Temp Posted May 23, 2023 Share Posted May 23, 2023 The Celotex U-Value Calculator goes up to 200mm Perimeter 0.3 100mm 0.16 150mm 0.12 165mm 0.11 200mm 0.09 1 Link to comment Share on other sites More sharing options...
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