Insulating Concrete Slab 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.

Insulating concrete slab roof. Lightweight insulated concrete also known as lwic is a material intended for use as an insulation and substrate for support and attachment of roofing membranes on slope roofs. Siplast lightweight insulating concrete is available in four mix designs. Ideal for use in commercial and residential construction quad deck combines the strength security and reliability of reinforced concrete with the energy efficiency fast construction and comfort of insulating concrete forms. The lwic systems are composed of either aggregate or cellular concrete.

Each design encapsulates the insulation board in insulating concrete. The r value of the insulating concrete depends on its unit weight and thickness. For this reason it is normally recommended see model code for energy conservation published by the u s. Creating a void between the old ceiling and new is better but ideally you need to eventually consider insulating the top of the concrete roof with solid insulation and a better covering grp or epdm.

To install such a roof a crew first builds a framework for the intended roof. Insulating concrete with galvanized steel centering this system provides a maintenance free economical roof system. Perimeter slab insulation heat loss through an insulated slab windows 33 roof ceiling 8 slab 15 6 doors 5 walls 39 insulation and fenestration criteria table 402 1 1 insulation and fenestration requirements by componenta climate zone fenestration u factorb skylightb u factor glazed fenestrationb e shgc ceiling r value wood frame wall r value. Using the correct insulation and correct detailing thickness is the only way of guaranteeing zero condensation.

These frames can either be removable concrete forms or stay in place insulating concrete forms which simply become a part of the finished roof. While flat roofs are the easiest to create out of concrete complex sloping roofs are also possible. Zic nvs insulcel and zonocel. The four designs represent a range of compressive and tensile strengths allowing a choice of system based on substrate and specific project circumstances.

One solution would have been installing rigid insulation under the slab turning it up on the perimeter to form a giant pan and then casting the concrete slab inside the pan. It consists of high tensile galvanized steel centering welded or attached with self tapping screws to the supporting steel framing together with either a 1 6 or 1 8 mix of vermiculite concrete. In cold climates climate zones 4 and higher it s important to install vertical insulation on the interior side of the stemwall all the way down to the footing. Many builders bevel the top of the vertical insulation so that none of the rigid foam is visible after the concrete slab is placed.