Answered By QS Team :
The install method when using a 4 upstand shower tray will depend on the shower direction and water build-up and runoff so that each install can be different.
If you seal as per enclosure IUG along the outer horizontal edges of the framework…
This will indeed act as a barrier, and on paper is the correct action, however, see the following points.
Sealing between the outer frame and upstand can be difficult if the gap is too small for the nozzle.
The gully created can act as a dirt-trap.
The gully created can act as a water trap, should the shower and spray direction be such that this gully fills with water and then it has no way to drain away as it becomes trapped between upstand and sealed frame.
If you choose not to seal as per the enclosure IUG.
The installer may choose to do this if they have had a bad experience with the first method (sealing along with the frame as per IUG) or feels there is not enough room and gap is too big to fill with silicone.
This may lead to water passing under the frame and leading to the gully filling up and tipping over the tray edge.
However, it may work better in some installations, allowing the gully to drain down rather than fill with water.
A compromise may be to fit the frame as close to the upstand as possible and seal down with silicone between the track and the upstand.
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