These roofs used bead adhesives to construct the roof assembly.
Lightweight concrete roof deck.
Nrdca gypsum roof deck repair replacement procedure.
Hard rocks with a low water absorption rate and weighs approximately 2403 kg m 3 150 lb cf.
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 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.
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.
What are the different types of concrete roof decks.
However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water.
The lighter the concrete the better lower the k factor.
However moist curing is preferable.
Lightweight insulating concrete roof decks are high performance roof insulation systems that reduce roof maintenance and replacement costs.
Lightweight roof deck concrete is self curing under most conditions.
The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete.
Nrdca 600 guideline for application of cementitious wood fiber roof deck 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.
Structural concrete composite deck.
With standard structural concrete the aggregate used is sand and stone.
The normal weight concrete employs standard aggregates i e.
Underlayment systems gypsum soundmat floor leveling cell crete has been california s floor system expert for over 40 years.
Vermiculite concrete is highly adaptable for concrete roof systems.
Picture story of gypsum roof deck repair sequence.
No vapor retarders were used.
Nrdca 300 procedures to determine the accuracy of material measuring equipment for lightweight insulating concrete.
Lightweight insulating concrete decks.
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.
The steel deck panels are embossed in a manner which when filled with concrete.
