When you are beginning to install a floor drain on most indoor surfaces, it is vital that you slope the floor at the proper angle so that water will efficiently flow to the drain. If you fail to achieve this slope, you may find yourself faced with floods or other standing water problems. Too much slope will leave visitors feeling as if they are walking on hills and cause an unsettling sensation of a downhill or crooked space.
To start, an experienced plumber will advise you to remove the existing floor; the remaining floor should be concrete or wood. Lay a waterproof floor liner that covers the entire space so that the area will not be affected by water. Consider folding the ends of the liner upward so that water cannot divert underneath the liner itself.
Make sure you know where the drain is to be installed, whether it is by way of an existing drain or another location such as in the center of a garage or bathroom or offset in a basement or walk-in closet. Cover the floor with mesh and ensure that is fixed as close as possible to the liner without cutting or tearing the liner. Make sure you leave a hole for the drain. Morningside has been plumbing Los Angeles for some time and has several recommendations based on what they normally see when entering a property to do work.
A critical item that is sometimes missed is this: Once you have the floor in place, calculate the slope to be created from the walls; a professional will know that water runs at a downward 14 degree angle so a preferred slope may fall between one-quarter and one-eighth inch for every foot of floor. Ensure that each area of the floor has a similar slope. Attach the bottom flange of the drain to the pipe if you are installing a brand new drain. If you are replacing a drain, remove the cover.
Mix the mortar depending on the manufacturer’s directions and spread it with a hand trowel across the floor; begin at the outside edges and work inward toward the drain. Make sure the mortar is built up to the lines you marked on the walls. Smooth the surface with a trowel and allow it to dry completely before installing tile or cement to finish the look.