How Thick Is A Concrete Roof Slab

Design the roof slab beam and column of house given in figure 1.

How thick is a concrete roof slab.

One of the most crucial step in building a flat concrete roof is to figure out the size of the concrete block you will need. Search is the most efficient way to navigate the engineering toolbox. Step 3 placing the steel joists. For a 6 inch slab r value would be between 0 6 and 1 2.

This is largely based on the types and the number of vehicles you plan to park on it. A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness. Concrete thickness for flatwork such as slabs on grade and driveways a minimum thickness of four inches is required but increasing the thickness to five inches can add nearly 50 percent to the load bearing capacity. Steel yield strength fy 40 ksi.

2 thick brick tile. The steel joists will provide a strong foundation for the flat concrete roofing. For small cars the concrete should be at least four inches thick. When working out the proper thickness of the slab you should take the appropriate size of any joints into consideration.

Live load 40 psf figure 1. Slabs s1 and s2 to be designed. To install such a roof a crew first builds a framework for the intended roof. Recommended thickness of concrete slabs engineering toolbox resources tools and basic information for engineering and design of technical applications.

These will support the concrete patio slab and will need to be a quarter of the depth of your slab. The construction of the original building consisted of a reinforced concrete frame with cast in situ trough floors. An extra floor was required to be constructed which involved converting the original roof slab to a floor slab thereby increasing the live load capacity to 3 kn m 2. For example a 4 inch patio slab will have a 1 inch concrete joint.

The blocks come in several sizes but this guide will assume you are using a 16 3 4 inch wide concrete slab. Light use for one to two light cars or trucks you can generally get away with pouring less concrete. How thick you pour your concrete floor can be determined by how the floor is going to be used. Concrete compressive strength fc 3 ksi.