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.

The AECB accepts no responsibility or liability for any errors or omissions in the content of this site. Views given in posts are not necessarily the views of the AECB.



General: roughcast render on OSB or Cementitious board

Bottom of Page

1 to 6 of 6

  1.  
    • CommentAuthorNiggle
    • CommentTimeNov 11th 2007
     
    I am building a superinsulated bathroom on a (1976) flat roofed extension to a roughcast rendered (1919) house. The outer sheath of this timber framed room can be OSB or Cementitious on 600mm frame centres, overall room size 4600 by 3000. As finish must match existing large stone roughcast, need advice on better board to use, whether expamet of fibreglass mesh is needed to improve adhesion and resist cracking
    • CommentAuthortony
    • CommentTimeNov 11th 2007
     
    What ever board you choose -- then breather paper then vertical laths (say 6mm x 20mm) and arround the perimeters, Then fix metal lathing, then render in three coats 1) pricking up coat 2) base coat 3) textured coat.
    •  
      CommentAuthornigel
    • CommentTimeNov 11th 2007
     
    Why not use heraklith board, insulated preferably to reduce cold bridging then St Astier mono lime render with a fibreglass mesh pressed into the first of two coats.
    • CommentAuthorNiggle
    • CommentTimeNov 12th 2007
     
    thanks Tony, presumably the laths keep gap between metal lath and base board, of 6mm?, the first coat filling the gap and covering the metal lath. Is this expanded mesh?

    I am unfamiliar with Heraklith Nigel, but a quick look at their website suggests their external board version is minimum 35mm thick, which plus render coats will give a problem of alignment with present wall below new extension
    • CommentAuthortony
    • CommentTimeNov 12th 2007
     
    The 6mm or 5 allows the render to hang on to the mesh rather than sit on the front.

    There are a variety of expanded metal meshes -- dont use Ali -- 8 x 2 sheets of galvanised eml are usually cheapest

    Stainless steel mini grids are an option but expensive
    •  
      CommentAuthorfostertom
    • CommentTimeNov 12th 2007
     
    Rather than 6mm laths, I used brass nuts I had a lot of as 5mm spacers - not difficult to sort of roll the EML up the wall, placing each nut behind and skewering with clout nail. Means the render maintains full thickness over whole surface.

    Nigel, you're saying the render gets adequate grip on Heraklith? - why then is the g/fibre mesh needed? Pse describe 'mono lime render'?

1 to 6 of 6

  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