In a stall shower, the plumbing code requires the floor to be sloped one quarter (1/4) of an inch per foot in order to carry the water effectively to the drain. This slope, according to the TCNA Handbook is called “sloped fill” or commonly known as the pre-slope.

What is the minimum slope of a finished shower floor?

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. In traditional tile shower construction, this slope is established in the mortar pre-pan.

How much fall should a shower have?





The recommended ratio of fall within showers is between 1:60 and 1:80. However, the ratios may not be achieved due to: (a) The size of the tiles used – falls become more difficult to achieve with larger tiles. (b) The area of the flool to be drained.

How much slope should a curbless shower have?

1/4” per foot

Slope of the shower floor



The International Plumbing Code (IPC) requires a slope of 1/4” per foot (IPC 417.5. 2 Shower Lining) for shower floors, which is echoed in the TCNA Handbook shower receptor methods.

How much slope should a walk in shower have?

between 1.5 and 2 degrees





The floor slope should be a minimum of between 1.5 and 2 degrees. This ensures the water will run to the drain efficiently and not cause water pooling. This gradient is also less enough to avoid the user feeling like they are standing on an uneven/sloped floor.

What do you use to slope a shower floor?

Quote from the video:
Quote from Youtube video: Now if I was on a job I'd probably protect this drain with with tape put some blue tape or stucco tape on there.

How do you find the slope on a walk in shower floor?

Measure from the drain opening to the furthest wall, then round up to the nearest foot. Calculate the slope by multiplying the measurement by 1/4 inch. For instance, if the drain opening measures 2-foot 8-inches from the furthest wall, then the shower floor should slope 3/4 inch from that wall to the drain.

What is the recommended minimum slope to fall for a wet room?

Creating a gradient in a wet room is one of the three most important components of wet room construction, and is vital in order to guide water down the drain efficiently. The minimum recommended fall is 12mm, and the slope needs to be formed into the floor itself.

How much slope should a bathroom floor have?



For bathroom floors, the recommended minimum fall to the waste shall be 1:100 (10mm per 1m). For shower areas with a vertical separation between the shower area and the wet area, such as a shower screen, hob, set-down or water stop, the fall to the waste shall be 1:100.

What fall is required for shower waste?

Waste pipes need to be installed sloping down to ensure the water runs the right way. This needs to be a minimum of 10mm fall for every 4m of pipe which can lead to insufficient fall within the floor void under baths or showers (especially under low-level or flush shower trays).

Is a shower pre-slope necessary?

A pre-slope is necessary because once water has reached there, it needs to be directed to the drain area. If underneath your liner is flat – without any slope to the drain – this will cause water build-up, eventually causing mildew.

Why have a curbless shower?



Curbless showers don’t have surface joints, so there are fewer places for mildew and grime to collect. Curbless showers add visual appeal and maximize space. Getting rid of the shower barrier allows the bathroom floor to flow from wall-to-wall creating a seamless look and significantly larger appearance.

How thick should a shower pre-slope be?

Your finished floor (after your liner and top mud bed are installed) needs to be 1″ to 1 1/4″ thick at the drain. So, if we make the pre-slope 3/4″ thick at the drain it needs to be a total of 1 1/2 inch thick at all your walls. So mark a line 1 1/2″ from the floor all the way around the wall studs.

How thick should shower pan mud bed?

Build the Primary Mortar Bed



With the waterproofing membrane in place, it’s time to put the final layer of Sand Mix down. The depth of this layer will be determined by the height of the adjustable drain but must be a minimum of ½”.

What do you put under shower base?

Mortar is recommended to use under all shower pans. Mortar reduces the risk of your pan slipping or cracking from an uneven surface.

Do you need to waterproof under a shower base?



Installation & Waterproofing



DON’T ignore the importance of waterproofing when installing an acrylic shower base. The walls and the area around the top of the acrylic base along the wall are very important for proper waterproofing and it is essential that it be done correctly.

How do you fill gap between shower pan and floor?

Quote from the video:
Quote from Youtube video: If you have a 3/4 inch gap you're going to be able to fill it with a piece of wood. Anything larger than that might be a problem. But.

Do you put cement board under a shower pan?

The cement board must be installed before the shower pan.



If the shower pan is not correctly placed, it might lead to other complications in the future. Therefore, it is important the person in charge of the installation gets it right at once. The wallboard should be placed 1/8 inch over the shower pan.

What goes first shower pan or walls?

Whether you choose to install tile or the panel walls, drywall always goes on top of the shower pan, after the pan is set into the floor.

Do I need a mortar bed for shower pan?



Designed to drain water from the shower, it protects your floor from water intrusion, rot and mold. Installing one requires some skill and there are certain rules and procedures to follow when doing so. In some cases a mortar bed is a necessity; other times it isn’t.