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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
    • CommentTimeSep 3rd 2019 edited
     
    Hi what would be the best adheisive to attach bamboo joists to a wooden Limecrete/UFH floor or would you reccomend plastic nails?
    If so could you point me in the direction of the type of nails or adheisive?

    I have underfloor heating within the limecrete..

    Cheers,
    Jon
    • CommentAuthorowlman
    • CommentTimeSep 3rd 2019
     
    Hi Jon,
    Can you be a bit more specific, more detail, please. Limecrete/UFH ?,- wood floor?, - joists? What exactly are you trying to achieve.
    • CommentAuthorYalch
    • CommentTimeSep 3rd 2019
     
    Appologies, I've just re-read and seen I put wooden floor :/

    I'm attaching bamboo joists to a Limecrete UFH Slab (bamboo as they are moisture resistant)

    Trying to figure out if there's an adheisive that would work being heated/coold due to the UFH or if I'm going to need to risk drilling into the UFH slab.

    Cheers
    •  
      CommentAuthordjh
    • CommentTimeSep 3rd 2019
     
    Do you know where the UFH pipes are? I hope so. Perhaps mark them on the surface of the limecrete and then fix the joists with plugs and screws in the normal way?
    • CommentAuthorowlman
    • CommentTimeSep 3rd 2019
     
    Re; Bamboo. Are you worried that your limecrete has moisture in it? despite UFH.
    • CommentAuthorjfb
    • CommentTimeSep 3rd 2019
     
    is it limecrete floor, then bamboo joists (unvented), then wood floor?

    Why not just lay everything as a floating floor so that the joists are not attached to the floor?
  1.  
    Or dampen the surface, turn on the ufh and take pics as it dries out. We did this to work out where our ufh was/wasn't.

    Id be looking for a thick rubbery adhesive layer that can cope with the differential expansion of the wood vs concrete when temp/humidity change, and take up the bumps/hollows of the floor. In our previous place, a hardwood floor company used a red rubbery mastic to bed wood flooring onto concrete subfloor. Maybe whoever you are getting your wood flooring from could recommend or supply a product?
    • CommentAuthorYalch
    • CommentTimeSep 3rd 2019
     
    Thanks will,

    I will look at dampening the service and using anchors. or I might (Id be looking for a thick rubbery adhesive layer that can cope with the differential expansion of the wood ) do this but not sure what would be good for this (will do some research)


    @jfb yes it is a limecrete floor then bamboo joists to create an airgap between the limecrete and the reclaimed maple gym floor that will go on top.

    (I have the bamboo already so can't raise the height any more as it runs into a suspended floor)

    @owlman - the limecrete is there to be a breathable floor so there will be moisture coming to and from it.
    • CommentAuthorYalch
    • CommentTimeSep 3rd 2019
     
    @djh - I unfortunately don't know but will try the dampen trick
    • CommentAuthorowlman
    • CommentTimeSep 3rd 2019
     
    I'm don't exactly follow you Jon; because your floor is breathable you are selecting bamboo as joists,because of it's moisture resistance. Do you really mean joists or just timber slats/bearers. Do you have some sort of damp proof membrane under the limecrete?
    I assume you are attaching some sort of wood flooring to these slats? If so how do you intend to do that?
    • CommentAuthorYalch
    • CommentTimeSep 3rd 2019
     
    No worries,

    There is not DPM because it's an 1890s house and the floor needs to be breathable otherwise it ends up causing rising damp in the walls.

    Yes bamboo slats I guess you could say. 35mmx40mm spread out at 450mm centers and spanning the width of the room.

    A maple T&G (3m lengths) floor is going to go on top of them and will be attached by porta nails.

    So im trying figure out the best way to attach the bamboo to the floor.

    I think like will said I may end up using a grab adhesive but the one problem with this is if anything does go wrong it will be mighty hard to pull it all up again. :D

    Hope that's a little clearer :)
    Cheers
    •  
      CommentAuthorfostertom
    • CommentTimeSep 3rd 2019
     
    This is new to me - bamboo joists - I see bamboo I-beams too. Anyone give me a quick rundown - costly? green credentials? accurate vs dodgy machined softwood? what's the typical use-case?
    •  
      CommentAuthordjh
    • CommentTimeSep 3rd 2019 edited
     
    green credentials: https://www.moso.eu/en/bamboo-certifications

    It seems they can be used for pretty much anything timber can, so there is no typical use case. FWIW, we're very happy with our bamboo floors. Harder than hardwood, seem to be pretty colour stable in sunlight. Don't move much.
    • CommentAuthorowlman
    • CommentTimeSep 3rd 2019
     
    I had an inkling that nailing to the battens is what you had in mind.
    Using some form of flexible adhesive to glue flooring battens to a solid floor is quite common, I've done it myself onto concrete. I'm not sure how it would react to limecrete or how powdery or friable the substance is. Some adhesives are so strong they may tear the top layer when you whack the flooring with the portanailer.
    Bamboo wouldn't be my first choice for such a job. I realise you already have it but it's very hard and may well split with the porta nails. Some tannalised PSE softwood may be a better bet, e.g. tile battens. Or with bamboo, you may well end up bending the nails. You probably need to do a test first with some battens screwed down to some concrete.
    On balance if you're determined to use the bamboo I think I'd screw the battens down, possibly used with adhesive too.
    • CommentAuthorYalch
    • CommentTimeSep 4th 2019
     
    @owlman,

    Awesome thanks for this info. Yeah unfortunately already got the battens as reccomended by another green building forum member due to their sustainability and also maisture resistance as well as being natural so no possibilitys of 'treatments' leaking/vaping into the air due to the breathable floor and UFH (arsenic/copper etc...)

    So I think I'll take your advise and give it a test first and see how it all reacts and then if it's good go with the grab adheisive :)

    Thanks very much!
    • CommentAuthorYalch
    • CommentTimeSep 4th 2019
     
    @fostertom

    djh has seemed to pretty much answered the question perectly and tyhat link is also perfect for the credentials. (y)
    • CommentAuthorowlman
    • CommentTimeSep 5th 2019
     
    Hi Jon,
    Aside from the fixing issues I've just re read that you're using Maple, is that solid or engineered? Pre-finished or to finish yourself upon completion?
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