Mortar For Bathtub Install

The mortar conforms to the contours of the tub and when it sets it prevents the tub from moving and supports the weight.

Mortar for bathtub install.

The tub should be level in all directions. Use thin set mortar when installing cement backerboard. Unless you re installing a cast iron bathtub you are going to need a mortar bed to support your tub base. With the smooth side of a 1 4 inch notched trowel spread enough mortar for one sheet.

Thinset tile mortar. For extra waterproofing install a shower pan liner between layers of mortar before laying the shower pan on top. The ratio is four shovels of sand to one shovel of cement and then you dry mix the components until they are completely blended. Custom mortar mix you can make your own mortar if you want to save money.

Pour the mortar on the subfloor so that it s a few inches from the drain opening. It is applied to the substrate with a notched trowel. Ridge the mortar with the notched side of the trowel. Mix the mortar so that it can support the tub.

Thin set dries slowly allowing you to fix and readjust backerboard sheets as needed. Thinset mortar is your default tile mortar for most indoor and outdoor applications. If the tub is not level use a floor leveling mortar a form or material suggested by the tub manufacturer to level the floor under the tub. Unsupported fiberglass and acrylic tubs tend to flex under the weight of water plus bathers which can be bad news in terms of your drain staying connected and the tub base remaining solid and free of cracks.

Trial fit the tub in the tub alcove. Thinset is a mortar that is made of portland cement silica sand and moisture retaining agents. Both regular thinset mortar and floor leveling compound are suitable. Thinset tile mortar has a smooth slippery consistency similar to mud.

Set the tub flat on the floor and position a level on top of the tub. Screw the shower pan rim into the wall studs using 1 1 4 inch screws through the pre drilled holes. Add water and. It should not be runny but rather stand up on it s own.

Then embed the tub into the mortar.