Minimum Slope For Shower Floor

Mortar bed and thin bed. The mortar bed method requires a reinforced mortar bed approximately 11 4 over the waterproof membrane. The larger the shower the easier it is to gradually slope the shower floor to the drain and contain water.

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Two common methods are used to waterproof showers.

Minimum slope for shower floor.

This includes tiling and gradients of bathroom floors including shower recesses. Flush transition between the room and the shower floor requires a recessed subfloor in the shower area. 36 should be considered the minimum depth for any curbless shower. The recommended ratio of fall within showers is between 1 60 and 1 80.

The membrane is typically referred to as a shower pan. I have found several references for 1 4 in per 12 in run. Both methods require that the floor be sloped 1 4 to 1 2 per foot from perimeters to a drain. And combining that with using the maximum 1 2 per foot of slope on the short 19 run 1 2 per foot times 19 that d give you just a tad over 3 4 of drop.

Aci 117 90 standard specifications for tolerances for concrete construction and materials gives a level alignment tolerance of 3 4 inch for top of slab elevation of slabs on grade. I asked for the minimum slope and it looks like it is sloped 1 and 1 4 inch for 22 inches from left to right. A 2 slope will probably ensure better drainage we could also find no slope tolerance for use when a floor slope is specified. Had your tiler gone for the minimum allowed slope on the 3 run you d have 1 4 per foot times 3 or 3 4 of drop.

My contractor has just ripped out my shower floor because it was very uneven. Shower floor slope to efficiently drain the recommended minimum slope for a shower floor is about 4 percent or a 1 2 inch drop per every 12 inches from the shower walls to the drain. If the slab elevation at the trench drain is within 3 4 inch of the plan elevation and the slab top elevation farthest from the drain is also within 3 4 inch of plan elevation the slab. The minimum standard required for wet areas in residential buildings is contained in the building code of australia bca and as3740 waterproofing of wet areas in residential buildings.

A depth of 42 is a significant improvement and 48 is even better. I am just trying to understand the code.

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