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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: To render or not to render?

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  1.  
    • CommentAuthorMarkH
    • CommentTimeJul 21st 2007
     
    We are increasing the pitch of a roof to enable a room to be created. The gable end will therefore need building up, including the addition of new facing bricks. Even if we manage to track down the same type of brick they are unlikely to match due to weathering of the existing bricks. It has been suggested that we render either just the gable or the whole house. Is there any real thermal benefit in doing that bearing in mind the construction is timber frame? This means that we would need to keep the air bricks clear to maintain some airflow in the cavity between the facing bricks and the timber frame. Any thoughts?
    • CommentAuthortony
    • CommentTimeJul 21st 2007
     
    1. It is more important to match the mortar than the bricks right bricks wrong tone of mortar looks like wrong bricks

    2. dont render house unless you are rich if you do dont paint it. There is no point in insulating render with wind in the cavities -- check your air leakage rates.
    • CommentAuthorTerry
    • CommentTimeJul 21st 2007
     
    Does it really matter if there is a small difference in the bricks? It will indicate a bit of the history of the house in the future
    • CommentAuthorBluemoon
    • CommentTimeJul 21st 2007
     
    Carmarthshire planners insisted on a pale painted rendered finish to the house I planned to build of wood. Dulux coloured smooth masonry paint is now £36 a can. I want to get away from it.
    • CommentAuthortony
    • CommentTimeJul 21st 2007
     
    Lime render it, then never touch it again. If you can't find the right coloured sand then add a pigment.
    • CommentAuthorchuckey
    • CommentTimeJul 21st 2007
     
    I have heard a tale of new bricks being "weathered" by spending 2 minutes going round in a cement mixer!
    Frank
    •  
      CommentAuthorted
    • CommentTimeJul 22nd 2007
     
    Bluemoon, you can get self-coloured render finish - needs no painting. Just been done on a new house along the road from me.

    Or try John Jones in Pentrecwrt for best prices on Dulux masonry paint. I paid 16.99 for 5L tins 12 months ago, quite a bit cheaper than the sheds.
  8.  
    I don't think it is a good idea to render facing bricks. Often, they expand and contract with moisture and temperature at a greater rate than say concrete blocks, sometimes leading to cracking and blowing of the render.

    I would settle for as close a brick match as possible, tilcon do a comprehensive range of mortar colour samples.
    • CommentAuthorMarkH
    • CommentTimeJul 23rd 2007
     
    Thanks for the comments, especially since they seem to support the least cost option!
    • CommentAuthortony
    • CommentTimeJul 23rd 2007
     
    We like saving money too as it is valuable resource as well!

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