Stone resin shower tray on 4x2 timber

4 Apr 2010
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United Kingdom
Hey if raising a stone resin shower tray on 4x2 timber 18mm plybase and a bed of mortar. Roughly what height would the centre of the 1.5inch waste pipe exit the shower trap?
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Hard to say. It depends on the thickness of mortar and which shower trap you use.
Would be trying to get a trap so the outlet would be as high up as possible. About 10mm mortar bed I would hope. Just wondering if I will have enough fall from the raised shower tray to the drain which goes in to an outside gulley at floor level. About 2 meters away.
It always exits quite high. You normally have to cut a hole in the ply just to get the trap up close to the tray. Two metres should be fine. 4" = approx. 100 mm so you have up to 50mm per metre which is plenty.
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Thanks can I ask what the minimum fall is required for an 1.5 inch waste pipe from a shower?
Sure I've heard the minimum fall for 4inch soil is 22mm in a meter, any ideas on the minimum fall for 1.5 inch waste?
The minimum falls are a bit misleading . In real world situations things can be altered and work fine - if you got a shallow seal trap and put a cleaning eye on your pipe where it exits the wall you could have a small fall, clear water will get away fine it's when the soap deposits build up that you need the cleaning eye and a snake ;) And do put the waste pipe below the gulley grid or you'll end up with a rancid grid :mad: I think the official fall is 2.5 degrees

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