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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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    • CommentAuthorowlman
    • CommentTimeMay 2nd 2017
    I've seen various methods of fitting under-mount sinks and the support needed either with epoxies and/or various clips and structural supports to the cabinet.
    My question however relates to the practicalities and aesthetics of the view from the top.
    Assuming a stainless steel sink under a granite or other solid surface:-

    1. To set the granite back from the sink edge by e.g.5mm.

    2. To set the granite dead flush with the sink edge.

    3. To overhang the granite by a few millimetres.

    IMO each method has pluses and minuses especially with the obvious silicone sealant application and it's eventual degradation. Any thoughts or experiences?
    • CommentAuthorPeterStarck
    • CommentTimeMay 2nd 2017 edited
    I've recently installed two undermount sinks under a granite worktop. I took advice from a friend who was a kitchen fitter and from the granite installer who both said to overhang the granite by 5mm. It looks good and I'm happy. I fitted the sinks with G clips and sealed with silicone sealant.
    • CommentAuthortony
    • CommentTimeMay 2nd 2017
    Undermounted sinks are inherently unhygienic as the overhang or join harbours bacteria and is very difficult to keep clean.
    • CommentAuthorowlman
    • CommentTimeMay 2nd 2017 edited
    @Peter; that method ( overhang), is usually the one recommended by granite manufacturers. I have a suspicion that it's also easier for them when positioning the sink from below as 5mm at one end and 3- 4mm at the other won't be too noticeable. It maybe also gives more surface area to bond to, depending on sink rim width.

    Whereas "under-hang" by 5mm and it has to be mm perfect as its easily noticeable. Yet "under-hang" is the preferred method of the sink manufacturers as they say it shows the sink to the best advantage.

    @tony; I too am a little bit wary. Top-mount/inset/lay on, is good as the sheer weight of the sink makes a good seal. Inset/ flushmount/ integrated looks the best if you can achieve it but it restricts the sink choice
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