Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)

Categories



Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!


powered by Surfing Waves




Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.




    • CommentAuthorrsk1
    • CommentTimeDec 19th 2019
     
    I am doing an area weighted u value calc for a glazed timber frame extension and am looking for a source of u value data. Specifically at this stage, for 150mm oak timbers and concrete pad subfloor with 150mm PIR and a screed .
    More generally, is there some 'comprehensive' source for u value data? somewhere with lists of values for different materials?
    • CommentAuthorRobL
    • CommentTimeDec 19th 2019
     
    I think the magic search term you're looking for is "thermal conductivity", often called "lambda" for insulation. Divide the thermal conductivity by the thickness, all in SI units, and you get the "U" value.

    Here's a list, I'm sure there are others:

    https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
  1.  
    Ralph,

    Shout me if you need anything. Floor U values are calculated w.r.t the ratio of exposed wall perimeter to area. I have a 'ready reckoner'. Nick
  2.  
    This one may be of use for U value calculations
    https://www.ubakus.de/u-wert-rechner/?#
    • CommentAuthorrsk1
    • CommentTimeDec 19th 2019
     
    <blockquote><cite>Posted By: RobL</cite>I think the magic search term you're looking for is "thermal conductivity", often called "lambda" for insulation. Divide the thermal conductivity by the thickness, all in SI units, and you get the "U" value.

    Here's a list, I'm sure there are others:

    <a href="https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html" rel="nofollow">https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html</a></blockquote>

    great, that little piece of info just switched a lightbulb on in my head
    And that is a pretty good list - even includes the thermal conductivity of raw potatoes!
    • CommentAuthorgyrogear
    • CommentTimeDec 19th 2019
     
    Posted By: rsk1thermal conductivity raw potatoes


    anagrams to:

    "Worthily compact, true devastation"
    •  
      CommentAuthorfostertom
    • CommentTimeDec 20th 2019
     
    Never a cross word.
  3.  
    Subterranean pest - Crypt tick
    •  
      CommentAuthorfostertom
    • CommentTimeDec 20th 2019
     
    I'll think about that and be right back to you.
    • CommentAuthorriboid007
    • CommentTimeJan 3rd 2020
     
    It is not a difficult calculation but maybe engage a SAP engineer who can do this for you very quickly and cheaply and you could use it formally for your drawing package submittal?
Add your comments

    Username Password
  • Format comments as
 
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press