There must be some sanitary and water supply pipes in bathrooms. If those pipes remain to expose it will look ugly and decrease the aesthetic look of bathrooms. To overcome this unwanted thing we need to cover those pipes. To cover those pipes, we need to make false slab in bathrooms.
What is a False Slab?
In general, a false slab is an additional slab which is made below or above the main floor slab.
It is made to serve different purposes. Sometimes it is made for interior design purpose and sometimes for other reasons.
But the solo purpose of making false slab in bathrooms is to hide various drainage and water supply pipes.
A false slab can be made with various materials. Such as wooden, PVC, RCC, etc.
In bathrooms, we often make RCC false slabs. Sometimes, PVC false slab is also made.
The benefit of making RCC false slab is, it does not only hide the various sanitary and drainage pipes, it can also be used for keeping some household materials.
In this post, I’ll discuss how to make RCC false slab in bathrooms.
How to Make RCC False Slab in Bathrooms
Before making false slab in the bathroom we need to make the masonry wall up to the bottom level of RCC false slab.
But the question is, what should be the level of a false slab in a bathroom?
Level of a False Slab in Bathroom
When defining the level of a false slab in a bathroom, we need to consider at least two things –
One is, The false slab should be made at such a level that the clear height of the bathroom remains usable.
Another thing is the height above the false slab. Sometimes we need to repair sanitary pipes above the false slab. The height above false slabs should be enough so that a worker can easily repair sanitary pipes.
Considering these things, we normally make false slab at 7′ above the finished floor of bathrooms.
You need to understand the difference between finished floor and unfinished floor. When we talk about the finished floor, we mean that the tiles installation on the floor has been completed. When we talk about the unfinished floor, we mean that the floor tiles haven’t been installed yet.
Obviously, when you go for making RCC false slab in bathrooms you’ll get the unfinished floor. So, at the time of fixing the false slab level in bathrooms, you need to consider the thickness of the tiles including mortar. Normally the floor tiles thickness with mortar is 1½″ to 2″. That means after fixing floor tiles, the floor will be raised up to 2″.
During fixing false slab level you need to consider this thickness. That means when you’ll make a false slab, keep the bottom level of the false slab at 7′-1½″ or 7′-2″ from the unfinished floor.
I think you can now define the level of false slabs in bathrooms.
Now let’s see what is the process of making RCC false slab in bathrooms.
Step by Step Process to Make RCC False Slab in Bathrooms
Making RCC false slab in bathrooms is actually easy. You just need to follow a step by step process which I’m describing below –
Step 1: Construct Masonry Walls Up to False Slab’s Bottom
You need to construct masonry walls of the toilet up to the bottom level of the false slab. Keep the door and window opening of the toilet as per architectural drawing.
After completing wall construction up to the bottom level of RCC false slab allow that for curing. No other works should be done before ending the curing period.
Step 2: Take The False Slab Level on Wall
After ending the curing period, you can now proceed to make RCC false slab.
For making RCC false slab you need to mark the bottom level of false slab on the wall.
Keep in mind that all false slabs in the toilets of a floor should be at the same level. It is not a good practice to make RCC false slab on the different level in different toilets on the same floor.
To keep the all false slabs’ level same on a floor, we fix a level for that floor. We normally take a level from the front of the lift lobby or stair lobby. Then we take that level to all toilets on the floor with the help of a water level pipe.
Mark the level on all wall surface inside the toilet with a marker pen. When marking, mark the level one foot below the bottom of the false sab. So that, you can check the level of false after shuttering is done.
After taking level on all four walls of the bathroom, you can now move for shuttering work.
Step 3: Make Shuttering for The RCC False Slab
We now know the level of RCC false slab. I want to make a thing clear here that when we take level for a floor slab we normally consider the top level of the slab. But when we take level for RCC false slab, we consider the bottom level of the false slab.
You can now do the shuttering work for the RCC false slab as you know the level. The top surface of the shutter should be one foot above the mark we made on walls.
For shuttering RCC false slab you can use Wooden planks, Plywood, and Bamboo.
Step 4: Finish Reinforcement Work
After completing formwork for RCC false slab, do the reinforcement work as per structural design. Normally a common reinforcement is often used for RCC false slab. However, you’ll find the reinforcement design in the structural drawing.
We normally use 10mm∅ bar@6″ c/c (center to center) distance in RCC false slab. You can use the same.
Step 5: Pour Concrete
After completing reinforcement work, it’s now time to pour concrete. Before pouring concrete, check the bottom level of the false slab again.
It is wise to cast all the false slab in a flat at a time. It’ll save you labor cost.
Constructing RCC false slab is actually easy. You just need to take care of the bottom level of the false slab as it is related to many other things. Such as the door level, wall tiles of bathroom etc.
After determining the level just follow the procedure which you do to construct other RCC member.
Share Your Expertise
Do you make RCC false slab in bathrooms? How do you make that? Please share in the comments below…