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.




Housing - Renovation: Liquid airtightness products , any experience or views?

Bottom of Page

1 to 8 of 8

  1.  
    • CommentAuthorjamesingram
    • CommentTimeJul 30th 2023 edited
     
    Hi , I came across these product recently , just wondering if anyone had used them or had any particular thoughts on them.
    First impressions it seems a potentially good way to solve airtightness in refurb projects, especially EWI work
    Here's an example
    https://www.intelligentmembranes.com/c/building-solutions/air-tightness-membrane/passive-purple-brush
    •  
      CommentAuthordjh
    • CommentTimeJul 30th 2023
     
    I haven't used them but they seem to have a fairly good reputation. An advantage is obviously ease of application in some complex situations, and they seem to be well certified. There's a story about one particular installation at https://passivehouseplus.co.uk/news/design-approaches/imperial-war-museums-archive-breaks-airtightness-record

    I think they are mostly vapour control layers as well as airtightness. I don't know of any breathable ones.
    • CommentAuthorSimon Still
    • CommentTimeJul 30th 2023 edited
     
    We used this (which seem similar) a lot during our self build project - very handy as a temporary protection for timber while building, or as an extra secondary protection. Here it mentions it as a water seal but equally good for airtightness (and it's in their airtightness catalogue)


    https://www.isocell.com/en/product/omega-liquid-dicht
    • CommentAuthortony
    • CommentTimeJul 30th 2023
     
    Seems very expensive to me. I don’t believe that is will stop radon as claimed, it is a vb so can’t be intelligent.

    What happens when the background cracks?
    • CommentAuthorTimSmall
    • CommentTimeJul 31st 2023 edited
     
    We mixed our own (aluminium hydroxide powder, SBR, acrylic sealant, and nylon rendering fibres), which was about a quarter of the price of the name brands. Not such an interesting colour tho'. Worked well, definitely useful for tricky uneven or friable surfaces and junctions.

    See also: https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14816
  6.  
    Cheers , good mix of info.
    Yes Tony, I agree , when the building moves all those cracks just open up.
    • CommentAuthorTimSmall
    • CommentTimeAug 2nd 2023
     
    I think it would accommodate a reasonable amount of movement without splitting or cracking due to the embedded fibres, and flexibility once its set (effectively a fibre reinforced rubber). I wouldn't have many worries using it on a masonry / timber junction. To allow for more movement, you could put some sort of expansion filler at the joint (e.g. draught proofing strip or squirty foam), and bridge over it with the paint-on-stuff.
    • CommentAuthorwookey
    • CommentTimeAug 2nd 2023
     
    I've used blowerproof and it's pretty good, but I did find I needed 2 coats to reliably avoid pinholes.
    There are lots of situations where it's dramatically easier than tape.
    Proclima Aerosana says it has "humidity-variable diffusion resistance" so is at least somewhat breathable.

    Datasheet says:
    Vapour permeability:
    sd value: 6 m (at 0.3 mm ; 13 mil thickness) (EN 1931)
    sd value, humidity variable: 0.13 - 10.00 m (EN ISO 12572)
    Vapour resistance:
    g value 30 MN·s/g (at 0.3 mm ; 13 mil thickness)
    g value, humidity variable 0.65 - 50 MN·s/g

    I've not looked up all the others to see how they compare.

1 to 8 of 8

  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