Lightweight Concree Roof Deck

Lightweight insulating concrete lwic is defined as having oven dry unit weights of 50 lbs ft or less.

Lightweight concree roof deck.

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. Vermiculite concrete is highly adaptable for concrete roof systems. The normal weight concrete employs standard aggregates i e. Lightweight concrete floor provides more efficient strength to weight ratio in concrete floor systems when compared to other conventional concrete floor systems.

However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water. Structural concrete composite deck. Lightweight insulating concrete roof decks are high performance roof insulation systems that reduce roof maintenance and replacement costs. 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.

Compressive strengths from 125 350 psi are common for lwic used in roof deck construction. Nrdca 250 field quality control procedures for application of insulating concrete roof deck systems. Lightweight insulating concrete decks. In addition to being one of the highest rated forms of roof decks concrete decks are also highly cost effective.

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. The lighter the concrete the better lower the k factor. However moist curing is preferable. Nrdca 300 procedures to determine the accuracy of material measuring equipment for lightweight insulating concrete.

The steel deck panels are embossed in a manner which when filled with concrete. Picture story of gypsum roof deck repair sequence. Lwic can be placed atop any of the above mentioned concrete deck types or. Lightweight insulating concrete low density non structural concrete comprised using ultra lightweight expanded mineral aggregates or preformed foam.

Lightweight roof deck concrete is self curing under most conditions. Lightweight insulating concrete lwic is batched on site and used to encapsulate expanded polystyrene insulation to provide permanent roof insulation and slope to drain. The reduced quantity of concrete and steel reinforcement offsets the marginally higher cost of lightweight concrete floor systems. These floors are constructed for different purposes but the reduction of dead loads on the structure is the main motivation behind using this system.

Lightweight concrete roof decks can withstand these high and sometimes relentless winds reducing the amount of damage to the roof. With standard structural concrete the aggregate used is sand and stone. Nrdca gypsum roof deck repair replacement procedure. The end result of the structural lightweight mix is a deck that can be 20 25 lighter than standard structural concrete.