Lightweight Concrete Roof Deck

However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water.

Lightweight concrete roof deck.

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. Structural concrete composite deck. Lightweight insulating concrete lwic is batched on site and used to encapsulate expanded polystyrene insulation to provide permanent roof insulation and slope to drain. What are the different types of concrete roof decks.

Hard rocks with a low water absorption rate and weighs approximately 2403 kg m 3 150 lb cf. Lwic can be placed atop any of the above mentioned concrete deck types or directly upon a properly supported corrugated steel. Nrdca 300 procedures to determine the accuracy of material measuring equipment for lightweight insulating concrete. Lightweight roof deck concrete is self curing under most conditions.

The steel deck panels are embossed in a manner which when filled with concrete. Lwic can be placed atop any of the above mentioned concrete deck types or. 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. Lightweight insulating concrete decks.

However moist curing is preferable. No vapor retarders were used. With standard structural concrete the aggregate used is sand and stone. 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. 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. Underlayment systems gypsum soundmat floor leveling cell crete has been california s floor system expert for over 40 years. Picture story of gypsum roof deck repair sequence.

The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete. The normal weight concrete employs standard aggregates i e. Vermiculite concrete is highly adaptable for concrete roof systems. 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.

Low density insulating concrete roof decks are monolithic composite systems cast over galvanized metal decks structural concrete wood decks or existing roof systems. Lightweight insulating concrete roof decks are high performance roof insulation systems that reduce roof maintenance and replacement costs. Nrdca 600 guideline for application of cementitious wood fiber roof deck systems. The lighter the concrete the better lower the k factor.