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Housing - Renovation: Limecrete with Expanded Glass U Value Decision

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    • CommentAuthorTomasz_P
    • CommentTimeMar 16th 2021
     
    Hi All,
    I have had quotes for 142sqm limecrete floor on expanded glass (ty-mawr). I have not yet decided whether to lay the glass myself or not. I asked for quotes for 0.18W/m2 K and 0.22 which is minimum for building regs. The house is very old and and currently has poor thermal properties. The difference between the two is about £2000 (a little over 10pc) plus extra labour cost digging. The floor will have underfloor heating run by an ashp (the rest of the house on oil for now). Do you think it is worth spending the extra for 0.04W/m2?!

    By the way, I will start a thread for this renovation once I have a bit more spare time!
    •  
      CommentAuthordjh
    • CommentTimeMar 16th 2021
     
    Why did you ask for 0.18 in particular?

    What are your overall plans and goals for the renovation? Without knowing that there's no way to say whether the additional cost is worthwhile.

    Laying the glapor yourself is by far the easiest part. The extra digging is harder work and that is pretty simple, but soil is heavier than foamed glass. But hiring a small digger (whatever you can get into the building) will make both jobs very easy.
    • CommentAuthorTomasz_P
    • CommentTimeMar 17th 2021
     
    Actually i didn't specifically ask but the company provided it to me.

    Overall we just want to make the house a lot more comfortable. I will be internally insulating the walls with wood fibre insulation on the ground and first floor but it is never going to be a massively thermally efficient home. I am sure i could do some calcs to roughly work out the cost saving over time but right now i just don't have the time!

    My issue with laying the glapor myself is that i would have to leave a lot of that to the labourers, who have never done anything like it before so it is very tempting to have the limecrete company deal with that too!
    • CommentAuthorTomasz_P
    • CommentTimeMar 18th 2021
     
    I have just been reading through some threads about levelling the glapor. It sounds like people tend to have a bit of a nightmare with this. My rooms might be easier because they are all large and square but i am not sure how my labourers would cope. I wonder whether i should leave this to the experts as i can only be on site a limited amount of time due to work.

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