Minimum Slope For Shower Floor

Mortar bed and thin bed.

Minimum slope for shower floor.

The recommended ratio of fall within showers is between 1 60 and 1 80. I am just trying to understand the code. 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. 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.

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 mortar bed method requires a reinforced mortar bed approximately 11 4 over the waterproof membrane. 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. The membrane is typically referred to as a shower pan.

Both methods require that the floor be sloped 1 4 to 1 2 per foot from perimeters to a drain. I have found several references for 1 4 in per 12 in run. 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. 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.

Flush transition between the room and the shower floor requires a recessed subfloor in the shower area. A depth of 42 is a significant improvement and 48 is even better. A 2 slope will probably ensure better drainage we could also find no slope tolerance for use when a floor slope is specified. The larger the shower the easier it is to gradually slope the shower floor to the drain and contain water.

36 should be considered the minimum depth for any curbless shower. Two common methods are used to waterproof showers.