Lightweight Concrete Roof Deck

Serd was originally founded as southeastern roof decks in 1963 and for 50 years primarily specialized in lightweight insulating concrete roof deck systems. Beneath the roof cover structural concrete roof decks are commonly topside insulated using adhered insulation panels or cast in place lightweight insulating concrete. Structural concrete deck a cast in place concrete deck serves as an integral part of the structure and is designed to carry heavy loads normal weight concrete is typically used for cast in place construction.

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Serd is a specialty subcontractor providing lightweight insulating concrete roof decks metal decking tectum acoustical roof deck panels engineered fills and material sales.

Lightweight concrete roof deck.

When structural lightweight concrete is then poured the aggregate voids are loaded with water. With structural lightweight concrete a mix of shale slate slag and clay are used and with this mix the aggregate is fully saturated prior to mixing. However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water. The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete.

If a roof is installed over the top surface and the deck was cast into non vented metal form deck the logical conclusion is that the dry down mechanism is at best severely retarded. The most common use of vermiculite lightweight concrete is for light structural roof decks and for insulation fill over metal decking and structural concrete. Hard rocks with a low water absorption rate and weighs approximately 2403 kg m 3 150 lb cf. Vermiculite for roof decks can be placed over various kinds of form boards fiber fiberglass acoustical and asbestos cement.

Lightweight insulating concrete low density non structural concrete comprised using ultra lightweight expanded mineral aggregates or preformed foam. Lightweight insulating concrete lwic is defined as having oven dry unit weights of 50 lbs ft or less. With standard structural concrete the aggregate used is sand and stone. Compressive strengths from 125 350 psi are common for lwic used in roof deck.

The normal weight concrete employs standard aggregates i e. The lighter the concrete the better lower the k factor.

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