21/08/2026
π οΈ The Friday Compliance Check Issue #5
Wet Area Set-Downs
They're one of the most overlooked steps in a bathroom build. But getting the set-down wrong can cause serious headaches long after the tiles are down. πΏ
π What we often find
A Wet Area floor that hasn't been set down enough (or set down incorrectly) before waterproofing and tiling begin.
β Why is it a problem?
The set-down allows the finished floor to fall correctly to the waste and keeps water from tracking out into the hallway or adjoining rooms. Get the set-down height wrong and no amount of good tiling or waterproofing can fix it. Once the slab is poured or the frame is set, there's often no going back without major rework.
β
How to avoid it
Confirm the required set-down height with your Certifier at frame stage, before the floor build-up goes in. This is what Scott is looking at in this video. Account for the full floor finish (screed, waterproofing membrane, tile bed, tiles) when calculating the drop, check it against the adjoining floor level before anything is covered up, and make sure all the structural elements are being supported correctly.
π‘ One Practical Tip
Don't assume the trades have coordinated. Set-down height depends on waterproofing thickness and floor finish, so it's worth a quick check between the builder, waterproofer and tiler before the pour or frame is locked in.
π The ACT Certification Take
A missed set-down doesn't just risk a failed inspection, it risks water damage down the track. A five-minute check at frame stage beats a costly fix once the Wet Area is finished.