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A stable and smooth roof deck is crucial for obtaining a solid roof. Concrete roof with shingles is a great solution for a solid roof. The most popular material used on the European market for roof structures is wood. A full deck for shingles is often built from OSB, plywood or wooden planks, followed by an underlayment and bitumen roof shingles that are nailed with roofing nails into that deck.
But in some other parts of the world, such as Southern Europe, Africa, Middle East or Southeast Asia, the roof structures and decks are made from solid concrete (as lumber is not always available) People in these areas built solid houses and roofs to protect themselves against bad weather, strong winds and heat. Using concrete provides them certainty in these circumstances.
To install a concrete roof bitumen shingles, a crew first builds a framework for the intended roof. These frames can either be removable concrete forms or stay-in-place insulating concrete forms, which simply become a part of the finished roof. Then a concrete mixture is poured, spread through the framework and reinforced with steel bars, which serve as a kind of skeleton for the cured concrete. While flat roofs are the easiest to create out of concrete, more complex sloped roofs are also possible. These options allow concrete roofs to match virtually any desired housing style, though sloped roofs require engineering and design.
Roofers can cover the roof with any type of roofing material to help give it the desired look. Of course a concrete roof requires more support than a typical wooden roof. It weighs a lot more than wood, so the outside walls have to be capable of supporting the giant concrete slab. Interior support beams can help, but the construction works best when the concrete walls, floor and roof form a solid shell. If a concrete roof isn't properly supported, it can collapse, especially if it is subjected to additional stresses such as earthquakes.
Concrete roof with bitumen shingles
As from spring 2021, IKO will offer 2 solutions on how to apply asphalt shingles on concrete roof decks. Fixing the shingles with special concrete nails is a first solution for slopes > 15°. For slopes > 4° -15°, shingles cannot be fixed mechanically. IKO Shingles can be flamed on Armourbase Thermo AD, a new underlayment in the IKO product portfolio providing a waterproofing layer and a perfect upper face to stick/flame shingles upon.
Want to know more about our Armourbase Thermo AD concept? Contact us!
Nailing method
The structure must meet the local national material standard and all applicable code requirements for local construction. The roof must be sufficiently supported to accommodate all anticipated roof loads during the installation of the tiles and the subsequent roof load. The concrete roof must be covered with a smooth layer of mortar with a thickness of 25 to 30 mm.
The mortar should be made on a ratio basis, with one part cement and 3 parts sand. The mortar must be covered with a layer of waterproof asphalt primer (Primer AD), which must be allowed to dry completely before installing shingles.
