# For curbless showers in wood framing, what deflection, waterproofing, and splash management prevent failures?

**URL:** <https://home.renovation.reviews/t/for-curbless-showers-in-wood-framing-what-deflection-waterproofing-and-splash-management-prevent-failures/20028>\
**Category:** Trade Talk\
**Created:** [August 4, 2025, 3:22pm UTC](https://home.renovation.reviews/t/for-curbless-showers-in-wood-framing-what-deflection-waterproofing-and-splash-management-prevent-failures/20028 "2025-08-04T15:22:51Z")\
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**Author:** ![reno\_questions](https://home.renovation.reviews/user_avatar/home.renovation.reviews/reno_questions/32/2758_2.png) [@reno\_questions](https://home.renovation.reviews/u/reno_questions)\
**Post date:** [August 4, 2025, 3:22pm UTC](https://home.renovation.reviews/t/for-curbless-showers-in-wood-framing-what-deflection-waterproofing-and-splash-management-prevent-failures/20028/1 "2025-08-04T15:22:51Z")

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For curbless showers in wood framing, what deflection, waterproofing, and splash management prevent failures?

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**Author:** ![Tim\_Michael1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_michael1/32/6294_2.png) [@Tim\_Michael1](https://home.renovation.reviews/u/Tim_Michael1)\
**Post date:** [August 13, 2025, 3:46pm UTC](https://home.renovation.reviews/t/for-curbless-showers-in-wood-framing-what-deflection-waterproofing-and-splash-management-prevent-failures/20028/2 "2025-08-13T15:46:17Z")

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Make sure your floor joists are stiff; aim for no more than L/360 deflection, especially if you’re putting in large tiles. Slope the shower pan ¼ inch per foot towards the drain, and use a continuous waterproofing system that connects to the drain flange. Extend the waterproofing at least a foot beyond the wet area. For extra protection, consider a linear drain at the entrance or a slight slope break. Size the shower, so water stays inside the glass. This will prevent splashes all over the bathroom floor!

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**Author:** ![Bobby\_Michael](https://home.renovation.reviews/user_avatar/home.renovation.reviews/bobby_michael/32/2057_2.png) [@Bobby\_Michael](https://home.renovation.reviews/u/Bobby_Michael)\
**Post date:** [August 13, 2025, 3:51pm UTC](https://home.renovation.reviews/t/for-curbless-showers-in-wood-framing-what-deflection-waterproofing-and-splash-management-prevent-failures/20028/3 "2025-08-13T15:51:42Z")

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Deflection  
-Minimize floor deflection: Ensure the floor joists are adequately sized and spaced to support the weight of the shower, water, and users. Typically, floor joists should not deflect more than L/360 (1/360th of the span length) under live loads.  
Waterproofing  
-Sealed shower system: Use a sealed shower system, like Schluter Kerdi or Wedi, which includes a waterproof foam shower tray or bonded waterproofing membrane. These systems are designed to prevent water damage and are recommended by the Tile Council of North America (TCNA).  
Splash Management  
-Proper slope: Ensure the shower floor is sloped towards the drain to prevent water from pooling. A minimum slope of 1/4 inch per foot is recommended.

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**Author:** ![Tim\_curtis](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_curtis/32/2766_2.png) [@Tim\_curtis](https://home.renovation.reviews/u/Tim_curtis)\
**Post date:** [August 13, 2025, 4:28pm UTC](https://home.renovation.reviews/t/for-curbless-showers-in-wood-framing-what-deflection-waterproofing-and-splash-management-prevent-failures/20028/4 "2025-08-13T16:28:01Z")

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For curbless showers on wood:

Deflection: Limit subfloor to L/360 under tile.

Waterproofing: Continuous membrane up walls greater than 6 inches, sealed at seams and drains.

Splash: Floor sloped quarter of a inch per foot to drain; prevent water pooling at edges.

Optional: extend waterproofing slightly beyond shower for extra protection.