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


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.

    • CommentAuthorjuliahm
    • CommentTimeJul 4th 2007
    One of our current projects is a renovation/residential conversion of a 1950's Hop-picker's Barracks. This is a long narrow building, with solid gable ends and long sides of repeated doors and windows. It has a single brick thickness shell wall, of common brick. We want to bring this up to AECB Silver Standard.

    We plan to line it with 100mm medium density block work. NHBC specifies an air gap between outer shell and insulation, but would it be satisfactory to completely fill the cavity with 100mm of polyisocyanurate (Celotex GA3000z), as this will be much easier for the Self-Builder to install? Exterior cladding on the long walls will be vertical cedar, and brick slips below windows. The gable ends could be clad with better quality brick, with or without an air gap between these and existing brickwork. Attention will be paid to cold bridging.

    So, can we have a fully filled 100mm cavity, and still meet Silver Standard?

    I have posted this on AECB site, but you guys have interesting opinions too! Advice will be welcomed!
    Hi Julihm.

    I think all PUR/PIR manufacturers stipulate a clear 30-50mm cavity for their products. Have you looked at the Celotex BBA certificate? This should confirm the need for the cavity.
    • CommentAuthorMike George
    • CommentTimeJul 4th 2007 edited
    • CommentAuthorjuliahm
    • CommentTimeJul 9th 2007
    Thank you for your help. We have resolved to try a different approach, resulting in 200 mm of insulation. We appreciate your comments.

    Best wishes, Julia HM.
    • CommentAuthorMrT
    • CommentTimeJul 10th 2007
    Forget the cavity and use external insulation with a rain screen.
    • CommentTimeSep 30th 2007
    I am discussing the same problem in another part of this web site......take a look at...http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=708&page=1#Comment_7466
    I think I have come up with a solution for my problem......
    • CommentTimeOct 2nd 2007
    Posted By: MrTForget the cavity and use external insulation with a rain screen.
    Absolutely. You're planning to clad externally anyway, so why eat up your internal space with an inner skin? as well as the cost of doing same. Internal insulation is a poor idea altogether - greatly preferable to put it outside the massive element, the brickwork, which should be wet plastered (not plasterboarded). BTW - does 'single brick' mean 4.5" thick or 9" thick?
Add your comments

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

© Green Building Press