Lightweight Concrete Roof Fire Rating

Coreslab hollowcore plank by coreslab carries a 1 hour fire rating in all applications by passing the test requirements set forth by astm e 119 as performed by u l.

Lightweight concrete roof fire rating.

Lightweight concrete the second choice for achieving a one hour fire rating in most ul designs is to pour lightweight concrete directly to the wood subfloor. Floors roofs and walls built from one layer of semi light weight of light weight concrete and one layer of normal weight concrete and each layer thickness is equal to 25 mm or larger. Fire resistance rating or fire rating is defined as the duration of time that an assembly roof floor beam wall or column can endure a standard fire as defined in astm e 119 3. Many buildings require an hourly fire rating as part of build ing code mandated designs.

1 normal weight 147 153 3 1 2 1 1 2 normal weight 147 153 4 2 normal weight 147 153 4 1 2. 1 inch 25 4 mm 1 pound per cubic foot 16 02 kg m3. The fire resistance of the two layer together is determined by. Lightweight insulating concrete is also considered non combustible and nailable.

Fire endurance of structures figure 5 shows the effect of fire on the resistance of a simply supported reinforced concrete. The 1 1 2 in. Bxuv d949 fire resistance ratings ansi ul 263 7 5 12 8 32 am. 2 3 governs materials and assemblies used for structural fire resistance and fire rated separation of.

Lwic systems can achieve a real cost savings of 1 00 to 1 50 per square of roof area for 1 1 2 hour or higher. The westford ma based national roof deck contractors association has published guidelines for rehabilitation of old gypsum decking. 38 mm is required to minimize the cracking that can be expected during the curing process. Normal weight or lightweight concrete.

Concrete masonry is widely specified for fire walls and fire barriers because concrete masonry is noncombustible provides durable fire resistance and is economical to construct. Dry unit weight of 35 pcf or less and consisting of cellular perlite or vermiculite concrete. The rn0 59 value for one 1 2 to 3 1 2 airspace is 3 3. Fire resistance of two layer concrete walls floors and roofs.

Typically the code may require a one to three hour fire rated roof system for protection of life from interior fires. Fire resistance of concrete is the ability of concrete to withstand fire or to give protection against fire. This involves the ability of concrete structural element to continue perform a specific structural function or confine fire or both. Chapter 7 of the international building code ibc refs.

Assembly rating hr concrete type concrete unit weight pcf concrete thkns in. The light weight is achieved through use of expanded aggregates such as perlite or vermiculite air entrainment or both. The duration of time that an element such as beam column wall floor or roof can endure. Structural function or both.