Grout is not waterproof. It never was. The membrane behind it is what keeps water out.
Corners move. They need flexible sealant, not rigid grout, or they crack open.
A flood test costs an hour and catches the mistake while it is still free to fix.
Grout is not waterproof. It never was. The membrane behind it is what keeps water out.
Corners move. They need flexible sealant, not rigid grout, or they crack open.
A flood test costs an hour and catches the mistake while it is still free to fix.