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Green Building Bible, Fourth Edition
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Building Regulations and Standards: Hot water cylinder bearing

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  1.  
    • CommentAuthorDavipon
    • CommentTimeMay 6th 2010
     
    I've recently tried to find if a regulation exists for bearings for standard hot water cylinders, our local building control say there's nowt and cylinder manufacturers say the same but I have a quality control fella in our office asking why I havn't put all sorts of board and bearing configurations under, any help would be gratefully received !
    • CommentAuthortony
    • CommentTimeMay 7th 2010
     
    good practice would be raise your cylinder off the floor by 75mm or more and have a piece of waterproof ply slightly larger than the base of the cylinder -- real wood floorboards would do too but not a couple of chunks of 4x2.
  3.  
    Are you talking about ground floor, 1st floor or in the roof? As per comment by Tony this is fine for ground/ first floor but in the roof it needs to be looked at more carefully. If it is going in the roof and you have gang-nail trusses you will need to look at this more closely as most truss manufacturers have specific reccomendations to make a platform to spread the loading over a larger area and to the strongest part of the truss. I worked for a truss manufacturer many years ago and remember that it was standard to issue a drawing showing the way the platform should be made. Unfortunately I have not got a copy on me at but would have thought it easy to find on the net.
    • CommentAuthorCWatters
    • CommentTimeMay 7th 2010 edited
     
    I don't think there are specific requirements in the building regs but there are general requirements eg that structures be strong enough. For example the floor joists must be strong enough to carry the weight of the tank. Some loft floors are only strong enough to support the plaster ceiling below. They aren't allways designed to carry the weight of a 300Kg+ load mid span.

    You also need to follow the cylinder manufacturers instructions. It might be necessary to spread the load over the base of the cylinder evenly using a platform of say 18mm WPB Plywood or similar. Unwise to just put the cylinder on two floor joists that could be 600mm apart. Tank might distort under it's own/water weight.

    Perhaps see page 51 onwards...

    http://www.mii.com/artefact/download.asp?aid=3881
    • CommentAuthorDavipon
    • CommentTimeMay 8th 2010
     
    Thanks all for help. The cylinder is sited in an airing cupboard and replaces a 10 yr old cylinder that had leaked at the base, it was originally placed on two 100mm x 50mm bearers on the suspended timber and chipboard floor. Our office bod was concerned that the cylinder had leaked through lack of support but we didn't want to bear directly on the floor in case a condensation issue developed inside the conical base of cylinder, we eventually opted for three 150mm x 50mm bearers to give lots of support and a bit of air flow.
    I must admit that I was suprised the manufacturers didn't have a prefered method !

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