I want to install a rain water storage tank in the loft of my garage. It
would get rain off the main roof of the house and be used for watering the
garden and maybe flushing the toilet.
How can I calculate what size of tank the loft can support. It's got
conventional prefabricated roof trusses and I'm looking to store about 1
cubic metre of water (1 tonne), though not all in the same tank.My aim would
be to put several tanks in to spread the load and make it possible to
actually get them up there
"Andrew Vevers" <http://www.environmentalconsultants.co.uk wrote in message
Refer to BS 5628: Part 3: 1998. Assuming that the roof trusses are standard
gang-nailed trusses, the rule of thumb for supporting tanks is as follows:
For tanks upto 230 litre capacity (standard domestic water storage tanks)
the the tank should be supported on a minimum 18mm plywood panel supported
on a minimum of three 100x50mm cross bearers (i.e. parallel to the trusses)
in turn supported on a minimum of 2 no. 100x50mm bearers (at right-angles to
the truss) spread over a minimum of 3 trusses. Spreaders should be placed
close to the nodes of the trusses.
For tanks upto 300 litres, spread the load over four trusses. For tanks more
than this, or multiple tanks, consult a structural engineer. It is YOUR
responsibility to ensure the installation is safe. If in doubt, consult an
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.