Nrdca 250 field quality control procedures for application of insulating concrete roof deck systems.
Lightweight concree roof deck.
Lightweight concrete floor provides more efficient strength to weight ratio in concrete floor systems when compared to other conventional concrete floor systems.
What are the different types of concrete roof decks.
Lwic can be placed atop any of the above mentioned concrete deck types or.
The normal weight concrete employs standard aggregates i e.
However moist curing is preferable.
These floors are constructed for different purposes but the reduction of dead loads on the structure is the main motivation behind using this system.
The lighter the concrete the better lower the k factor.
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.
Picture story of gypsum roof deck repair sequence.
Compressive strengths from 125 350 psi are common for lwic used in roof deck construction.
Lightweight insulating concrete lwic is defined as having oven dry unit weights of 50 lbs ft or less.
With standard structural concrete the aggregate used is sand and stone.
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 roof deck concrete is self curing under most conditions.
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.
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.
Lightweight insulating concrete decks.
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.
The reduced quantity of concrete and steel reinforcement offsets the marginally higher cost of lightweight concrete floor systems.
The steel deck panels are embossed in a manner which when filled with concrete.
Lightweight insulating concrete low density non structural concrete comprised using ultra lightweight expanded mineral aggregates or preformed foam.
Vermiculite concrete is highly adaptable for concrete roof systems.
In addition to being one of the highest rated forms of roof decks concrete decks are also highly cost effective.
Lightweight insulating concrete roof decks are high performance roof insulation systems that reduce roof maintenance and replacement costs.
However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water.
Structural concrete composite deck.
