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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.

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    • CommentAuthorKenny_M
    • CommentTimeOct 24th 2019
    I would like to externally insulate a couple of timber lintels and a timber post. They are currently protected from the elements by a thin sheet of ply which is painted gloss white.

    I had wondered if I could just remove the ply and stick XPS direct to the timber, then paint with an acrylic, water based paint, in the hope that with the paint on the surface that this would look much the same visually (conservation area so not supposed to change the look without planning).

    Anyone done this before? I believe that surf boards are often just painted XPS so should work, but not sure how the finish will look. I can of course test paint a bit of xps but I thought I would ask in case someone has done similar.
    • CommentAuthorGreenPaddy
    • CommentTimeOct 24th 2019
    I'm thinking birds pecking at it for nesting material, or to get at insects - they've done that sheets I left outside.

    What about applying the base coat for the multi layer polymer render system, which is a very hard surface, and dries like a floated concrete? That's pretty cheap, not so difficult to do, especially on a small area. Then paint it colour of choice.
    • CommentAuthorowlman
    • CommentTimeOct 24th 2019 edited
    You could use something like this, then you'll have a fine cementitious surface to apply your finish to.

    • CommentAuthorKenny_M
    • CommentTimeOct 25th 2019
    Thanks both, good ideas. I'll look into both. Think the tiling boards are usually ridged from memory, but if I could get a smooth faced product this might work, although I would still have to do something with the edges, so I would probably have to do some rendering if the XPS won't take the paint directly.
    • CommentAuthorowlman
    • CommentTimeOct 25th 2019
    From memory I think smooth masonry paint is gloopy enough to cover the mesh dimples on backer boards and a couple used as base coat may give a decent enough surface for a further final finish. Alternatively it should be easy enough to trowel a fine surface filler on first.
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