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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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    • CommentAuthorcullym
    • CommentTimeFeb 14th 2014
     
    Plans for my retrofit are moving along. I've had a preliminary PHPP carried out based on sketch designs and QS has just frightened the life out of me with preliminary costings. I'm going through the estimate at the moment seeing what I can trim/what I can do myself.

    One question I have is with regards to floor build up. The existing floor is:

    150mm slab, 25mm insulation and 75mm screed

    To reach the PHPP Enerphit target I was looking at digging this out. The architect/QS has spec'd:

    150mm slab, 250mm EPS, 100mm screed

    I'm wondering if the 150mm slab is necessary. I was thinking maybe a floor build as per the attached image might work.

    I will raise it with the architect on Monday but I was hoping the team could help and tell me why this would or wouldn't work.
    • CommentAuthorjamesingram
    • CommentTimeFeb 14th 2014 edited
     
    I think that would work fine. Done it a couple of times just as shown.
    Getting a good finish (as good a trad. screed) on the concrete is difficult for refurb.
    fine if you tiling . I've used self levelling compound to finish off concrete to improve final finish .
    so
    200mm ish EPS with 125-150mm conc. (not screed) on top should be fine
    • CommentAuthorMackers
    • CommentTimeFeb 14th 2014
     
    That build up looks fine to me too. On a separate note, what software did you draw that in?
    • CommentAuthorcullym
    • CommentTimeFeb 15th 2014
     
    @jamesingram - thanks. So you'd recommend full conc slab on top. Would liquid screed work in this circumstance. I'm sure it would cost a packet but just interested to know if it would work.

    @mackers - didn't draw it found it online somewhere ages ago and had it saved in a doc.
    • CommentAuthorSaint
    • CommentTimeFeb 15th 2014 edited
     
    How about an insulating screed? Range of thermal conductivities between 0.043 and 0.067 depending on compressive strength required topped off with a monolithic fibre cement screed say 20mm.
    Replaces the EPS, slip sheet and screed in your example. Overall lesser thickness possible whilst achieving equivalent U value, faster to install, less wastage, faster curing and drying. Price similar or even less (I think).
  1.  
    Saint sounds good , got any links.
    How about limecrete on glaspor , no dpc . for a different angle approach
    http://www.lime.org.uk/products//limecrete-and-sublime/sublime-breathable-floor-solution/
    • CommentAuthorcullym
    • CommentTimeFeb 15th 2014
     
    Excellent, thanks guys, some alternatives to discuss with the architect at least.

    Saint if you have any links it would be great if you could post them. The only thing I can find on the subject seems to discuss using vemiculate as an aggregate.
    • CommentAuthordaserra
    • CommentTimeFeb 15th 2014
     
    I'd do a thin screed instead of sand underneath on top of the hardcore.
    •  
      CommentAuthordjh
    • CommentTimeFeb 17th 2014
     
    I'd be tempted to put the DPM in between layers of EPS rather than underneath, to protect it better.
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