How Thick Is A Concrete Roof Slab

The construction of the original building consisted of a reinforced concrete frame with cast in situ trough floors.

How thick is a concrete roof slab. Search is the most efficient way to navigate the engineering toolbox. Slabs s1 and s2 to be designed. 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. Recommended thickness of concrete slabs engineering toolbox resources tools and basic information for engineering and design of technical applications.

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. When working out the proper thickness of the slab you should take the appropriate size of any joints into consideration. How thick you pour your concrete floor can be determined by how the floor is going to be used. These will support the concrete patio slab and will need to be a quarter of the depth of your slab.

To install such a roof a crew first builds a framework for the intended roof. Generally speaking lower density concrete provides better insulation than higher density concrete. For a 6 inch slab r value would be between 0 6 and 1 2. Concrete compressive strength fc 3 ksi.

The steel joists will provide a strong foundation for the flat concrete roofing. This is largely based on the types and the number of vehicles you plan to park on it. Step 3 placing the steel joists. Live load 40 psf figure 1.

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. Exact specifications vary but most concrete roofs are several inches thick. 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. For small cars the concrete should be at least four inches thick.

Design the roof slab beam and column of house given in figure 1. Steel yield strength fy 40 ksi. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. The blocks come in several sizes but this guide will assume you are using a 16 3 4 inch wide concrete slab.