How Thick Is A Concrete Roof Slab

These will support the concrete patio slab and will need to be a quarter of the depth of your slab.

How thick is a concrete roof slab. Concrete compressive strength fc 3 ksi. For a 6 inch slab r value would be between 0 6 and 1 2. Steel yield strength fy 40 ksi. When working out the proper thickness of the slab you should take the appropriate size of any joints into consideration.

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. Design the roof slab beam and column of house given in figure 1. Search is the most efficient way to navigate the engineering toolbox. Exact specifications vary but most concrete roofs are several inches thick.

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

The steel joists will provide a strong foundation for the flat concrete roofing. Live load 40 psf figure 1. 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.

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. Slabs s1 and s2 to be designed. Light use for one to two light cars or trucks you can generally get away with pouring less concrete. 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.

For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. How thick you pour your concrete floor can be determined by how the floor is going to be used. Generally speaking lower density concrete provides better insulation than higher density concrete. This is largely based on the types and the number of vehicles you plan to park on it.