im about to run my wet underfloor in the bathroom. I was going to run it under the resin shower tray because why not, might dry it out, help with mold etc. But then its dawned on me that it might dry out the trap which is obviously no good.

My trap is as low a water seal as they come, 25mm. Does anyone have any thoughts or experience with the traps drying out due to UFH? Could easily not run it near the shower tray but it seems it would have its benefits. Obviously not at the expense of the bathroom stinking 2 hours after a shower.

2 minutes ago, Super_Paulie said:

help with mold

If you are getting mould its really a ventilation issue that needs to be resolved.

 

You will get two camps of answers here, but I didn't and would bother with UFH under shower or a bath

I can't see any good reason to put ufh under a shower and several against.

 

Trap drying out adds to the list and is a good point.

I think it's a good idea. 

 

More comfortable, dries the tray (slightly) faster. 

 

The UFH pipes will only be at 20 something degrees so I doubt they'll have enough punch to dry out the trap. 

 

 

 

 

Maybe so called under tile heating with electric elements just for the 10 mins you're in the shower might be an option. 

I do it on almost every job. 
 

Doesn’t dry the trap out, that’s a wife's tale, as you’d only do 2/3 of the dead end of the tray anyways; when you turn the shower on the hot water almost instantly warms the remaining 1/3, and the UTH is a 1/3 of the tray away from the trap.

 

”Do it”. 🫡🙂

Contrasting opinions there, but as long as it doesn't dry out the trap I'll go for it.