Poured concrete roof construction

Can a roof be made of concrete?

A concrete roof is exactly what it sounds like: a solid slab of concrete capping the top of your house. Exact specifications vary, but most concrete roofs are several inches thick. Contractors can cover the roof with any manner of finish, tiles or shingles to help give it the desired look.

How thick does a concrete roof need to be?

The flat concrete roof itself can be up to 7 inches thick although the greater the thickness , the more the concrete will need be poured in increasing numbers of layers, with each one needing to dry before the next is poured. The roof needs to be thick in order to provide insulation and proper protection.

How do you join two concrete roofs?

New RCC slab can be joined with the existing one as in the following steps. Chip off the existing slab up to a certain depth (preferably 15 cm) Drill reinforcement bars into the existing slab. Apply a bonding agent so as to act as a bonding agent for new and old concrete . With the support of formwork cast the new slab.

How do you waterproof a concrete roof?

Liquid rubber can be used over any flat roof covering, even concrete , cement and asphalt. How to apply liquid rubber: To achieve a perfect finish, adding some liquid rubber optional extras before you start can help make your waterproofing even more durable.

How long does a concrete roof last?

Clay and concrete tile roofs are one of the most cost-effective choices due to their long lifespan— 50 to 100 years or more. Both concrete and clay tile outlast other roofing materials, with manufacturers offering warranties from 50 years to the life of the structure.

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What is the minimum thickness of roof slab?

The overall thickness of slab is usually kept 10 cm though the minimum thickness can be 7.5 cm. The minimum area of reinforcement per unit width of a slab shall not be less than 0.15%. of the gross cross sectional area of concrete.

What is the minimum thickness for concrete?

2 inches

Which cement is best for roof casting?

Portland pozzolana cement

How deep underground can you build?

The depth to bedrock can range from a few feet to hundreds of feet. In many locations, it is well under 100 feet .

How long does concrete last underground?

Modern concrete —used in everything from roads to buildings to bridges—can break down in as few as 50 years. But more than a thousand years after the western Roman Empire crumbled to dust, its concrete structures are still standing.

Can concrete blocks be used underground?

Block Types Both lightweight and dense aggregate concrete blocks can be used below ground level.

How do you attach new concrete to old concrete?

Drill 5/8-inch diameter holes six inches deep into the old concrete . Flush the holes with water. Inject epoxy into the backs of the holes. Insert 12-inch lengths of rebar into the holes, twisting them to ensure an even coating of epoxy around their circumferences and along their lengths within the holes.

Does concrete stick to old concrete?

The cement within a concrete mix doesn’t contain any natural bonding agents – so when fresh concrete is added on top of an existing layer of concrete , the two won’t join together. Once cured, the new concrete will simply sit on top as a separate layer.

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How do you attach concrete to concrete?

Start by cleaning the older concrete with a strong acid wash. Then, prepare a bonding slurry to ensure the new concrete adheres to the previous layer. Dampen the existing concrete , apply the bonding slurry, then add your new concrete .