Defect type
·2 observations
High · 2–4/5
Shower Floor Fall Insufficient to Drain to Waste
I ran water in the shower recess and it ponded on the floor rather than draining cleanly to the waste - I measured a fall flatter than the 1:80 reference I work from (AS 3740). In my experience standing water then loads the grout lines, saturates the membrane at the low point, and tracks under the hob into the adjacent room. I often see this where the screed has been laid flat to suit a large-format tile layout.
Causes
- Tile screed laid flat or with fall well short of 1:80
- Waste outlet set too high relative to the surrounding finished floor level
- Large-format tiles bridging the drainage fall and creating localised flat spots
Symptoms to look for
- Persistent pooling or slow drainage of water in the shower base after use
- Discoloured, softened or missing grout at the waste outlet
- Moisture damage visible in the ceiling or wall of the room below or adjacent
Remedies
- Re-screed the shower base to achieve a fall of at least 1:80 to the waste, then reinstate membrane and tiling
- Lower the waste outlet and install a puddle flange to suit the new screed level
- Consider a linear drain upgrade where large-format tiles are desired
Critical
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