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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.

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    • CommentAuthorandyman99
    • CommentTimeJan 8th 2019
     
    I have had EWI (graphite EPS) and render installed over most of my extension. There is a small strip (1.5m wide) that will be clad and as yet is just a single skin wall without any insulation. I've not quite decided on the cladding, but will need insulation with a better value than the EPS, so the final buildup keeps the cladding roughly inline with the render. Whats the best U-value EWI that can be used with cladding? I've come across Kingspan K5, but would like to be sure that this is appropriate. I'm probably going to do this bit myself as its only a small strip compared to the rest of the extension so if anyone can point to a good guide it would be most appreciated.

    Also we are considering a non-wood cladding, possibly something like Dura Cladding which is a composite timber/recycled plastic product (many others seem available). Just wondering if anyone has experience of these products.

    Thanks

    Andy
    •  
      CommentAuthordjh
    • CommentTimeJan 8th 2019
     
    I would think K5 would be fine; phenolic is one of the safer and better insulating foam boards. (no personal experience though)

    No experience of Dura or other composite cladding either, but personally I'd stick to cedar or larch rather than a product with 'UV Colour stability'. I'm hoping for more than 25 years from my cedar cladding and the other claims seem equivalent.
    • CommentAuthorTimSmall
    • CommentTimeJan 9th 2019 edited
     
    Phenolic has good U value, the only down side is that it soaks up water quite readily, shouldn't be too much of a problem once the cladding is on assuming it's ventilated, but you might want to be careful how you store it on site.

    Sweet Chestnut is popular locally (Sussex - there is a local producer), and seems to weather well. I've also heard good things about Kebony, but I've not used either personally.
    • CommentAuthorbhommels
    • CommentTimeJan 9th 2019
     
    Kingspan K5 is (I think) what is used in the Kooltherm cavity closers I used. It is phenolic, almost cork-like, and has nice glass fibre facings as a key for render, adhesive and what have you.
    I found K5 board difficult to source if you want less than 500m2, so please post a follow-up where to get it!
  1.  
    A bit off topic but on the subject of timber cladding, we're using Brimstone Ash.

    https://www.vastern.co.uk/cladding/brimstone-overview-page/

    It's a thermally modified timber using British grown species that aren't usually durable enough for outdoors (Ash, Poplar, Sycamore). Comparable with Cedar on both durability and cost terms when I last checked.

    Treatment does take place in France though, so no idea what will happen long term after March...

    Lovely colour when it goes on (chocolate brown), weathers down to the standard silver grey over the year but is very dimensionally stable and seems resistant to swelling etc. Only downside is that it's quite brittle so you need to watch out for impact/dropping of the planks.

    I'll post some photos on the forum at some point once the scaffolding's down.
    •  
      CommentAuthordjh
    • CommentTimeJan 10th 2019
     
    Posted By: Doubting_Thomaswe're using Brimstone Ash

    I'm paranoid about ash because it can suffer from a couple of types of boring creatures. I see that the vastern page says the treatment makes it resistant to rot, but what about beetles and worms? I'd hope and expect its OK but I'd suggest checking.
  2.  
    Posted By: djh
    I'm paranoid about ash because it can suffer from a couple of types of boring creatures. I see that the vastern page says the treatment makes it resistant to rot, but what about beetles and worms? I'd hope and expect its OK but I'd suggest checking.


    Thanks for the 'boring' question..!

    From what I can tell beetles generally feed on sapwood and wood with a moisture content above 30%. I'd hope the heat treatment reduces this (as I understand it the lignin etc. is baked out, hence the brittle end product). That said, I'm also aware we do have a north facing elevation so I'll keep an eye on how this dries generally after rain.
    • CommentAuthorandyman99
    • CommentTimeJan 10th 2019 edited
     
    Posted By: Doubting_ThomasA bit off topic but on the subject of timber cladding, we're using Brimstone Ash.

    https://www.vastern.co.uk/cladding/brimstone-overview-page/" rel="nofollow" >https://www.vastern.co.uk/cladding/brimstone-overview-page/

    It's a thermally modified timber using British grown species that aren't usually durable enough for outdoors (Ash, Poplar, Sycamore). Comparable with Cedar on both durability and cost terms when I last checked.


    We visited Vastern last week and came away with a sample of the brimstone Poplar. It looks great atm, but of course will weather to a silver grey and we were trying to see if there was any way to avoid this. It seems the answer to that is probably no, which is why we are now also considering synthetic products. But pictures would be welcome!

    As regards the K5, I need to research some more, it seems to be suitable, but I can't find details on how to use it in conjunction with cladding. The EPS/render installation used starter tracks, edging pieces etc and I assume I'll need something similar when installing the insulation behind the cladding area.
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