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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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    We have now removed the 1970's concrete slab in the downstairs loo, and re-positioning the toilet to the outside wall means we don't need the soil pipe crossing the floor. This has restored the floor level down to the original earth floor, which is dry and quite solid, but probably not the best thing for the downstairs toilet. So we need to 'finish' it in some way, without raising the level too much as we're also under the stairs, so head height is compromised to a degree. The adjacent lounge has a slate floor circa 1870 which is 1" thick slate slabs laid on more random slate, with (probably) lime mortar giving an overall thickness of about 120mm. We want to preserve the step down into the loo, so would like to have a finish that is no more than 50mm thick. We could pour a limecrete screed, but I'd quite like to maintain the slate floor theme. Could we just lay thick slate tiles directly on the earth floor? Cost isn't much of an issue as the floor area is really small.
    • CommentAuthorsnyggapa
    • CommentTimeAug 3rd 2018
    our place has slate tiles set in lime mortar as a flooring in the main hallway. The assumption always was that these were ~25mm thick slates, but talking to the man who is renovating the place, coincidentally he laid that floor 20 or so years ago and they are just plan old roofing slates !

    Seems much more robust than I imagined they would be and have stood up to 20 years of abuse
    I have a good collection of roofing slates!
    • CommentAuthortony
    • CommentTimeAug 3rd 2018
    Single large piece of slate, or resin bond three layers of the slates you have and finish with resin 30mm overall might work.
    <blockquote><cite>Posted By: tony</cite>Single large piece of slate, or resin bond three layers of the slates you have and finish with resin 30mm overall might work.</blockquote>

    Do we reckon a single large piece of slate directly onto the earth would be ok? That would be easy to do.
    • CommentAuthortony
    • CommentTimeAug 3rd 2018 edited
    25mm thick I reckon would be what are the dimensions?

    I would dig or scrape down a bit and sit it on carefully laid 50mm eps
    • CommentAuthorjemhayward
    • CommentTimeOct 23rd 2018
    Its about 1200 x 900mm and we need to come up a bit from the soil so 50mm EPS would be viable. Is EPS now considered better than Celotex in this sort of application?
    • CommentAuthortony
    • CommentTimeOct 24th 2018
    Cheaper, breathable, slightly less good insulating properties
    • CommentAuthorjemhayward
    • CommentTimeNov 17th 2018
    We've decided to use foam tile backing board as it was available in the right dimensions and thickness and, and we're using a dual layer which we feel should then support the 30mm slate floor. Hope fully this will give a good balance between breathability, insulation and strength... time will tell!
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