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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.

Buy individually or both books together. Delivery is free!


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    • CommentAuthorluz13827
    • CommentTimeSep 29th 2021 edited
     
    Hello, would anyone know whether there's Jablite EPS 70 would be fine, or if 100 would be better suited, as insulation over the structural concrete slab, but under 100mm of polished concrete final floor finish?

    Their specs seem to indicate either... but I'm not sure if it's better to go with 100 to be safe https://www.jablite.co.uk/wp-content/uploads/2016/12/Jabfloor-70-100-150-200-250-below-slab-Technical-Data-Sheet.pdf
  1.  
    I've always used EPS 100 under the slab. Is the cost difference so great that the extra insurance of higher compressive strength blows the budget? (the thermal performance difference of 0.002 W/mK is IMO insignificant)
    •  
      CommentAuthordjh
    • CommentTimeSep 29th 2021 edited
     
    Posted By: luz13827Hello, would anyone know whether there's Jablite EPS 70 would be fine, or if 100 would be better suited, as insulation over the structural concrete slab, but under 100mm of polished concrete final floor finish?

    Their specs seem to indicate either... but I'm not sure if it's better to go with 100 to be safe https://www.jablite.co.uk/wp-content/uploads/2016/12/Jabfloor-70-100-150-200-250-below-slab-Technical-Data-Sheet.pdf

    The data sheet refers to the BBA and it also says "Structural steel reinforcement must be placed onto spacer pads sufficient to prevent puncturing the VCL". In other words it says nothing about the spec of the slab itself. I expect that will have to be specified by a structural engineer, who will also specify the appropriate grade of EPS.

    The issue is whether the compressive strength of the EPS is sufficient to prevent point loads on top of the slab causing sufficient tensile stress in the bottom of the slab to cause it to crack. That's what structural engineers are paid to know.
    • CommentAuthorbhommels
    • CommentTimeSep 29th 2021 edited
     
    Jablite is one of the few products that include 1% deformation figures in their specification sheets.
    From looking at various other EPS product specifications, I reckoned that the long term compressive strength of EPS is about 30% of its 10% deformation rating, which matches nicely with the 1% deformation strength of Jablite at 20 kPa.

    100mm of concrete (polished or not) weighs up to 250kg/m2. With a floor loading of another 250 kg/m2 maximum the compressive strength needs to be 500 kg/m2 or 5 kPa.

    I think it will be fine. I might be biased because I used a similar product under my 80mm screed floor. So far, 2 years in, it still feels solid.
    • CommentAuthorluz13827
    • CommentTimeSep 29th 2021
     
    Thanks all - I called one of the retailers (who specialise in floors) and they said for domestic purposes, 70 would be fine. @bhommels, thanks for the technical details!
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