HouseChalk
Sheet membrane
A sheet membrane is a pre-formed, factory-made waterproof layer applied to shower walls and floors before tile installation.
Why it matters
Its factory-controlled thickness provides consistent waterproofing, unlike liquid-applied products that depend on application technique.
Where people get this wrong
Sheet membranes are bonded to the surface with thin-set mortar. The seams must be properly overlapped and sealed to prevent leaks.
Real-world example
The installer cuts the sheet membrane to fit the shower walls, embeds it in thin-set, and seals all seams and corners with membrane strips.
Where this hits your build
This hits during the selection phase. Choices here affect layout, daily use, and maintenance. Samples and measurements matter more than catalog photos.
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