My guide to the WRAS is silent on this question and google has not found me the answer. I wonder if someone here can advise me please.
Introduction:
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In my bathroom I am mounting the hand basin in a worktop on a box. The sides of the box will be tiled. The box contains the soil pipe, hot and cold supply pipework and the cistern for the back-to-box loo. I want this worktop to 'lift off', complete with the basin, to provide access inside the box.
To achieve this I need to use flexible pipes to the basin for h/c supply and for waste.
I propose to use washing machine hoses: hot and cold supply would be supplied via the usual WM valves which would be mounted inside the box. The waste would be through a conventional washing machine hose clamped to the usual conical plastic spigot (is that the right word?) also mounted inside the box.
When the worktop is on the box (normal use) all these connections would be invisible.
I could use those braided pipes for supply, but I am not sure they make them long enough. For waste there are wider flexible hoses available but they seem to be of the 'flex once then leave' type not of a design to withstand multiple flexings.
My questions:
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Am I allowed to do this? There will be access to the box without the use of tools - the top will lift off with the basin attached as I said, but it would not be obvious if something leaked? All the pipework, including the valves will be inside the box.
Would a WM drain hose provide a big enough flow? Is there a rule about this or is it simply a question of whether I am happy with the rate of flow?
thank you for reading to the end :-)
Robert