# For linear drains, which common slope and waterproofing errors do inspectors flag most?

**URL:** <https://home.renovation.reviews/t/for-linear-drains-which-common-slope-and-waterproofing-errors-do-inspectors-flag-most/20018>\
**Category:** Trade Talk\
**Created:** [August 4, 2025, 3:21pm UTC](https://home.renovation.reviews/t/for-linear-drains-which-common-slope-and-waterproofing-errors-do-inspectors-flag-most/20018 "2025-08-04T15:21:56Z")\
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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, 3:21pm UTC](https://home.renovation.reviews/t/for-linear-drains-which-common-slope-and-waterproofing-errors-do-inspectors-flag-most/20018/1 "2025-08-04T15:21:56Z")

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For linear drains, which common slope and waterproofing errors do inspectors flag most?

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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, 4:15pm UTC](https://home.renovation.reviews/t/for-linear-drains-which-common-slope-and-waterproofing-errors-do-inspectors-flag-most/20018/2 "2025-08-13T16:15:46Z")

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They’ll spot floors that aren’t sloped right, like flat areas or slopes going the wrong way. Also, they’ll notice if the waterproofing isn’t connected to the drain or if seams aren’t sealed well. Messed-up corners and open holes are obvious problems.

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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, 4:17pm UTC](https://home.renovation.reviews/t/for-linear-drains-which-common-slope-and-waterproofing-errors-do-inspectors-flag-most/20018/3 "2025-08-13T16:17:42Z")

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Inspectors most often flag insufficient slope toward the drain, usually less than 1–2 percent, and laps or gaps in the waterproofing membrane, especially at the drain flange or corners. Improper bonding to the drain channel and lack of continuous membrane under tiles are also frequent issues.

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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, 4:19pm UTC](https://home.renovation.reviews/t/for-linear-drains-which-common-slope-and-waterproofing-errors-do-inspectors-flag-most/20018/4 "2025-08-13T16:19:10Z")

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-Slope Errors:  
Insufficient Slope, Poor Drainage Design  
-Waterproofing Errors:  
Inadequate Waterproofing Membrane Installation, Inadequate Surface Preparation