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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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    • CommentAuthorYalch
    • CommentTimeJun 6th 2019
    I am putting down a limecrete screed with geocell beneath and am putting a reclaimed junkers wood flooring ontop.

    I am going to use some 40mm wood battens to nail down the wood flooring and keep an air gap to allow everything to ventilate and breath.

    My question is, are 40mm battens going to be thick enough?

    • CommentAuthorgyrogear
    • CommentTimeJun 6th 2019 edited
    As I see it, it is not the width of the airspace that counts, but the nature of the wood that will be in contact with the limecrete, because it could ROT...


    "Some of our clients have laid timber floors onto the limecrete floor, the best practice for this is as follows:– Store the timber in the room that it is going to be laid in so that it can adjust to the humidity– Lay treated wooden battens onto the screed, this creates an air gap that needs to be vented (possibly through the timber joints)– Lay the timber onto the battens to complete the floor"

    If you don't want copper and arsenic leaching or vaping up into your interior, you might consider using bamboo, or plastic battens: although seemingly more expensive at acquisition, they might leave your lungs alone for a bit longer...

    BTW, avoid fixing the battens themselves to the screed with metal - latter will also rot; rather use nylon nails, sprags etc. That way, less surprises on those occasional disco evenings...

    • CommentTimeJun 6th 2019
    Posted By: gyrogearBTW, avoid fixing the battens themselves to the screed with metal

    Why would you fix the battens to the screed at all?
    • CommentAuthorgyrogear
    • CommentTimeJun 6th 2019
    to prevent the floating floor from ... floating !

    • CommentAuthorjfb
    • CommentTimeJun 6th 2019
    Well it's not really going to float if the boards are fixed to battens.

    I have a similar conundrum. Expanded glass sub base, limecrete floor and wood floor. I was planning on insulating 50 mm between battens and no ventilation. If it all.goes wrong not the end of the world and some insulation sounds good.
    sounds thick enough
    • CommentAuthorYalch
    • CommentTimeJun 8th 2019
    Awesome thanks for your replies, :)

    The bamboo is an interesting Idea for sure, stainable too.
    • CommentAuthorYalch
    • CommentTimeJun 14th 2019
    @gyrogear any idea on where I would be able to source some bamboo battens ?
    Been looking about and they don't seem that easy to come by.

    • CommentAuthorgyrogear
    • CommentTimeJun 14th 2019 edited
    well I'm in Old Europe, so I guess this supplier is of no use to you...


    perhaps click the Contact box and ask them if they have a UK supplier ? (they probably come from PRC in any case...).

    Otherwise, you might have to consider ripping bamboo decking boards, bit of a shame though, not to mention the extra work !
    Good luck !

    • CommentAuthorYalch
    • CommentTimeJun 16th 2019
    Thanks so much :)

    I'll give it a shot!
    • CommentAuthorYalch
    • CommentTimeJun 16th 2019
    I've found these; https://www.kedel.co.uk/product/recycled-mixed-plastic-square-post-nailer-batten-40-x-40mm/

    Do you think that they would do the job? (just thought I'd double check) :D

    • CommentAuthorgyrogear
    • CommentTimeJun 16th 2019 edited
    Well, they do not seem to be for inside usage... (but neither is the treated timber recommended in earlier reference...). Perhaps why the technical data does not mention any offgassing risks - viz. VOC's...

    They are treated anti-UV - that probably implies more nasty chemicals...

    (BTW, when I stated "plastic battens" above, I meant "composite wood" - or wood-plastic composite

    but I see that even *that* can contain nasties so with hindsight, please allow me to pull that suggestion !

    I'd still try a bit more for the bamboo...

    Declaration of engagement (!) I have rather a lot of PVC windows (but it is uPVC...)
    (but I also live in a radon-prone region...).

    • CommentAuthorYalch
    • CommentTimeJun 17th 2019
    Haha no worries. This is all super useful though. Ill keep trying a bit more for the bamboo :)

    • CommentAuthorYalch
    • CommentTimeJun 17th 2019
    Also, has anyone used insulation dowels on flooring? as they look ideal but I'm not entirely sure if they'll be strong enough as a metal rot free substitute:

    • CommentAuthorYalch
    • CommentTimeJun 18th 2019
    I've just come across these https://www.mosobamboosurfaces.co.uk/product/bamboo-x-treme-outdoor-beams-chocolate-2000x40x40mm-sku-bo-dtht2173-01/#

    I've asked them the question to see what they are treated with, if anything and hopefully should be good to use :)
    • CommentAuthorgyrogear
    • CommentTimeJun 20th 2019
    well found, Sir !

    • CommentAuthorYanntoe
    • CommentTimeJul 25th 2019
    We replaced all our downstairs suspended floors with Limecrete/over Technopor and then used 40mm "mini-joists on adjustable plastic cradles before refitting the old floor boards.
    We used noggins to add stability to the mini-joists.

    By doing this we end up with a very well insulated floor, no draughts, a void for services ( we've run wiring/ethernet and satellite cabling and pipework in the void) and a very stable and level old looking floor.

    It's a great result and the one thing I would definitely do again in an renovation!
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