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.
Lightweight concrete roof deck.
Hard rocks with a low water absorption rate and weighs approximately 2403 kg m 3 150 lb cf.
Nrdca 600 guideline for application of cementitious wood fiber roof deck systems.
However moist curing is preferable.
Lightweight roof deck concrete is self curing under most conditions.
What are the different types of concrete roof decks.
The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete.
Vermiculite concrete is highly adaptable for concrete roof systems.
With standard structural concrete the aggregate used is sand and stone.
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.
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.
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.
Picture story of gypsum roof deck repair sequence.
No vapor retarders were used.
The lighter the concrete the better lower the k factor.
The steel deck panels are embossed in a manner which when filled with concrete.
Underlayment systems gypsum soundmat floor leveling cell crete has been california s floor system expert for over 40 years.
Lightweight insulating concrete decks.
Nrdca 300 procedures to determine the accuracy of material measuring equipment for lightweight insulating concrete.
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 lwic is batched on site and used to encapsulate expanded polystyrene insulation to provide permanent roof insulation and slope to drain.
Thereafter precast systems are commonly topside insulated below the roof cover using adhered insulation panels or cast in place lightweight insulating concrete.
Lwic can be placed atop any of the above mentioned concrete deck types or directly upon a properly supported corrugated steel.
The normal weight concrete employs standard aggregates i e.
Structural concrete composite deck.
Lightweight insulating concrete roof decks are high performance roof insulation systems that reduce roof maintenance and replacement costs.
Lwic can be placed atop any of the above mentioned concrete deck types or.
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.
The most common use of vermiculite lightweight concrete is for light structural roof decks and for insulation fill over metal decking and structural concrete.
