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.




General: Interstitial condensation risk in warm roof advice

Bottom of Page

1 to 4 of 4

  1.  
    • CommentAuthorJC48
    • CommentTimeJul 11th 2016
     
    Dear All
    We fitted the Ubbink UB 48 vents for the MVHR through my warm roof which has a build up as follows Insulated plasterboard - VCM -400mm rockwool-18mm plywood-Intelligent membrane -counter batten - batten - then tiles .
    The problem with the Ubbink vent is you can't reseal the hole in the roof membrane because the vent sits down on the flashing with a collar so you ant slide the flashing up to seal the gap as the collar stops it .

    The question is does a gap around the vent pipe on the top surface of the roof cause a risk of Interstitial condensation . I could refit with a plastic sleeve in the roof first which could then be sealed but before I go to this trouble I wanted to get some advice
    thanks
    • CommentAuthortony
    • CommentTimeJul 11th 2016
     
    No but there could be risks from condensation on both the inside and outside of the duct and possible air tightness problems too.
    • CommentAuthorJC48
    • CommentTimeJul 11th 2016
     
    Thanks Tony

    The vent is insulated and has a drain point for the exhaust inside . I will talk to Ubbink to see if I can get the flashing as a separate item and re do it by installing a sleeve first then the vent - hassle but worth getting right as this is the last job on the house .
    • CommentAuthortony
    • CommentTimeJul 11th 2016
     
    If you have a gable I would consider shoving the duct/vent through that.

1 to 4 of 4

  1.  
Add your comments

    Username Password
  • Format comments as
 
Back to Discussions Top of Page
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press