The most common use of vermiculite lightweight concrete is for light structural roof decks and for insulation fill over metal decking and structural concrete.
Lightweight concrete roof 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.
No vapor retarders were used.
Vermiculite concrete is highly adaptable for concrete roof systems.
The lighter the concrete the better lower the k factor.
However moist curing is preferable.
Lightweight roof deck concrete is self curing under most conditions.
Structural concrete composite deck.
Nrdca 600 guideline for application of cementitious wood fiber roof deck systems.
Underlayment systems gypsum soundmat floor leveling cell crete has been california s floor system expert for over 40 years.
However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water.
These roofs used bead adhesives to construct the roof assembly.
Thereafter precast systems are commonly topside insulated below the roof cover using adhered insulation panels or cast in place lightweight insulating concrete.
The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete.
Lwic can be placed atop any of the above mentioned concrete deck types or.
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.
Nrdca 300 procedures to determine the accuracy of material measuring equipment for lightweight insulating concrete.
Picture story of gypsum roof deck repair sequence.
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.
Nrdca gypsum roof deck repair replacement procedure.
Lwic can be placed atop any of the above mentioned concrete deck types or directly upon a properly supported corrugated steel.
With standard structural concrete the aggregate used is sand and stone.
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.
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 roof decks are high performance roof insulation systems that reduce roof maintenance and replacement costs.
Low density insulating concrete roof decks are monolithic composite systems cast over galvanized metal decks structural concrete wood decks or existing roof systems.
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.
