Lightweight Concrete Roof Fire Rating

Criteria for coreslab to carry a 2 hour fire rating is found in chapter 7 of the international building code 2000 sections 703 3 and 720.

Lightweight concrete roof fire rating.

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. Fire resistance of concrete is the ability of concrete to withstand fire or to give protection against fire. 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. Chapter 7 of the international building code ibc refs.

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. Fire resistance of two layer concrete walls floors and roofs. Structural function or both.

Fire endurance of structures figure 5 shows the effect of fire on the resistance of a simply supported reinforced concrete. 2 3 governs materials and assemblies used for structural fire resistance and fire rated separation of. The 1 1 2 in. Because lightweight concrete shrinks when it cures a minimum of 1 1 2 in.

Assembly rating hr concrete type concrete unit weight pcf concrete thkns in. Typically the code may require a one to three hour fire rated roof system for protection of life from interior fires. 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. This involves the ability of concrete structural element to continue perform a specific structural function or confine fire or both.

38 mm is required to minimize the cracking that can be expected during the curing process. Lightweight insulating concrete is also considered non combustible and nailable. Fire resistance ratings of two wythe concrete walls for si. Bxuv d949 fire resistance ratings ansi ul 263 7 5 12 8 32 am.

1 inch 25 4 mm 1 pound per cubic foot 16 02 kg m3. The westford ma based national roof deck contractors association has published guidelines for rehabilitation of old gypsum decking. 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. The light weight is achieved through use of expanded aggregates such as perlite or vermiculite air entrainment or both.

The fire resistance of the two layer together is determined by. 1 normal weight 147 153 3 1 2 1 1 2 normal weight 147 153 4 2 normal weight 147 153 4 1 2. The rn0 59 value for one 1 2 to 3 1 2 airspace is 3 3. The duration of time that an element such as beam column wall floor or roof can endure.