Basement Drain Diameter:
The diameter of a basement floor drain is usually between 1/2″ to 3/4″. This means that if your house has a 2′ x 4′ room, then it will have two floors.
If you are using a standard size pipe (1/2″), then you would need to use one or two 1/2″ pipes for each of the two floors. So, if you want to put a drain in the middle of the first floor, then you would need two 1/2″ pipes. You could also use three 1/2″ pipes instead of two if you wanted to get rid of some space on the second floor.
In most cases, it is better to make sure that there is enough room on both sides so that your drain won’t clog up. To make sure that the drain will fit into the hole, you can measure it with a tape measure.
For example, if your drain is going to be about 1/2″ deep, then you could cut out a piece of paper and mark off the exact depth of the drain. Then just take another piece of paper and trace around that line. Cut out both pieces of paper and stick them together. Also, you might not need all the space on one side. For example, if you are putting a drain in the middle of the first floor, then you don’t really need to put a drain in the center of the second floor. So, if you have extra space on one side, then you can leave it empty and just fill it later with soil or sand.
Building The Walls
After you have cut out the holes for your drains, it is time to build your walls. You want to make sure that the floor is exactly level before you pour the concrete, so try to get this as close to perfect as possible.
Most people will use a long 2×4 and build a small frame, then place this in the middle of each space and measure the front, back, and two sides with a tape measure. You will want to do this in every corner. If the floor is not exactly level, then your walls will lean when you place the rigid foam on top. You could also use a long piece of lumber (door skin) or a long piece of metal (dryer vent duct).
If you want, you can put drop cloths over all your furniture and carpet to protect them from any spills or drips.
When you build the walls, try to leave a little extra on each side so that you can trim it later. It is better to make them a little wider than narrower since you can always cut them down, but you can’t add more if you cut too much off.
After you get all your walls built, you can check them with a level to see if they are straight and then use a carpenter’s square to make sure that the corners are at perfect right angles.
Now it is time to put rigid foam (spray foam) on the floor. If you haven’t already, make sure that you wear your mask and goggles while you do this.
It can get messy if you aren’t careful.
If you are planning to build walls on top of your floor, then you should lay down rigid foam in 3″ or 4″ thick layers so that your floor will be high enough for you to walk around comfortably when you are done.
Sources & references used in this article: