Lightweight Concrete Roof Deck

Picture story of gypsum roof deck repair sequence.

Lightweight concrete roof deck.

Vermiculite for roof decks can be placed over various kinds of form boards fiber fiberglass acoustical and asbestos cement as well as over paper back wire lath. The lighter the concrete the better lower the k factor. The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete. Structural concrete composite deck.

The normal weight concrete employs standard aggregates i e. With standard structural concrete the aggregate used is sand and stone. The steel deck panels are embossed in a manner which when filled with concrete. Low density insulating concrete roof decks are monolithic composite systems cast over galvanized metal decks structural concrete wood decks or existing roof systems.

Nrdca 300 procedures to determine the accuracy of material measuring equipment for lightweight insulating concrete. Vermiculite concrete is highly adaptable for concrete roof systems. However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water. Thereafter precast systems are commonly topside insulated below the roof cover using adhered insulation panels or cast in place lightweight insulating concrete.

These roofs used bead adhesives to construct the roof assembly. No vapor retarders were used. Nrdca gypsum roof deck repair replacement procedure. 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.

Lwic can be placed atop any of the above mentioned concrete deck types or directly upon a properly supported corrugated steel. Lightweight insulating concrete decks non structural low density lightweight insulating concrete lwic can be placed upon a variety of structural deck systems that have been designed to carry loads. What are the different types of concrete roof decks. Lightweight insulating concrete lwic is batched on site and used to encapsulate expanded polystyrene insulation to provide permanent roof insulation and slope to drain.

Repaired areas exposed to high temperatures direct sunlight or extremely windy conditions should be lightly misted with water or covered with damp burlap for 24 hours. Lightweight insulating concrete decks. Lwic can be placed atop any of the above mentioned concrete deck types or. Hard rocks with a low water absorption rate and weighs approximately 2403 kg m 3 150 lb cf.

However moist curing is preferable. Lightweight roof deck concrete is self curing under most conditions. Recent f2170 probe tests on 2 year and 7 year old structural lightweight concrete roof decks yielded relative humidity readings in the 90 98 range. Underlayment systems gypsum soundmat floor leveling cell crete has been california s floor system expert for over 40 years.