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