Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Wall u value calc

  • 04-01-2021 1:03am
    #1
    Moggaman
    Registered Users Posts: 350 ✭✭


    Hi . My design involves a sand cement render externally on a 100mm outer leaf, 200mm blown bead cavity , 100mm inner leaf with sand cement and skim finish. I attempted a u value calc .. see below.Can you tell me if I am thereabouts or am I missing something...
    seems to me if you could guarantee effectiveness of PIR ie non thermal looping it is a no brainer in terms of u values...
    Appreciate it . Thanks

    Resistance to external surface 0.048 r
    External render - 0.347
    Concrete block outer leaf standard 0.075
    Blown beads 200mm thick at 0.032 conductivity = 6.25 r
    Concrete block inner leaf standard -0.075
    Internal sand cenent and skim - 0.075
    Resistance to internal surface - .122
    Total resistance- 6.99
    U value 1/r = 0.143???
    Thanks


Comments

  • #2
    Biker1
    Registered Users, Registered Users 2 Posts: 393 ✭✭Biker1


    Moggaman wrote: »
    Hi . My design involves a sand cement render externally on a 100mm outer leaf, 200mm blown bead cavity , 100mm inner leaf with sand cement and skim finish. I attempted a u value calc .. see below.Can you tell me if I am thereabouts or am I missing something...
    seems to me if you could guarantee effectiveness of PIR ie non thermal looping it is a no brainer in terms of u values...
    Appreciate it . Thanks

    Resistance to external surface 0.048 r
    External render - 0.347
    Concrete block outer leaf standard 0.075
    Blown beads 200mm thick at 0.032 conductivity = 6.25 r
    Concrete block inner leaf standard -0.075
    Internal sand cenent and skim - 0.075
    Resistance to internal surface - .122
    Total resistance- 6.99
    U value 1/r = 0.143???
    Thanks

    Cavity wall.pdf


  • #3
    Moggaman
    Registered Users Posts: 350 ✭✭Moggaman


    Thanks Biker1.


Advertisement