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U value query

slowharry · 2008-05-28 11:33:24

i was looking at the regs and cant get my head around the logic with the u value requirement at ceiling level into an unheated attic space being 0.16 and a flat roof being 0.22. both secenarios are heat loss to the building. u values between walls and floors are irrespective of wheter its into an unheated space or…

28-05-2008 12:33pm

#1

slowharry

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Join Date: May 2007

Posts: 237

i was looking at the regs and cant get my head around the logic with the u value requirement at ceiling level into an unheated attic space being 0.16 and a flat roof being 0.22. both secenarios are heat loss to the building. u values between walls and floors are irrespective of wheter its into an unheated space or external.

maybe i'm just missing something

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Comments

#2 28-05-2008 1:09pm

sinnerboy

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your not - I agree with you , but

read values as MIN values

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#3 29-05-2008 9:04am

slowharry

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Join Date: May 2007

Posts: 237

thanks sinnerboy

yeah i agree with using them at min values. i always try to get an understanding of where a code/regulation is coming from and the thinking behind it (none in this case). it makes working with it alot easier.

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#4 29-05-2008 9:19am

Mellor

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The flat roof one should be alot lower, equal to the trad roof insulated on flat
(i'm not saying the pic in the op is wrong, im saying this should be the case)

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