One Hour Fire Rated Roof Assembly

Keep in mind that most of the wood truss fire rated assemblies call for a minimum depth of 12 in.

One hour fire rated roof assembly.

Fire resistance ratings are expressed in the number of minutes or hours a structure can withstand a fire simulation test. Generic fire rated assembly listing construction elements 1 5 hr rating 1. The following tables are only summaries of the fire rated assembly reports. Fire safety caution passing a fire test in a controlled laboratory setting and or certifying or labeling a product as having a one hour two hour or any other fire resistance or protection rating and therefore as acceptable for use in certain fire rated assemblies systems does not mean that either a particular assembly system.

2x4 16 o c. With 1 2 wood structural panels with. Table 1 one hour fire rated loadbearing wood frame wall assemblies. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.

According to the engineered wood association a one hour rating indicates that a wall constructed in a manner similar to the one tested will contain flames and high temperatures and support its full load for at least one hour after the fire begins. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. Assemblies rated from both sides. Test reports are available from reporting agencies or wtca where indicated.

Users must consult the listed agency s documentation for complete information. A one hour rating would mean the structural elements have not yet reached their yield point when exposed to a under deck heat load defined in astm e119 for steel structural members as reaching 1 070 degrees f. Truss technology in building figure 1. 5 8 type x gypsum wallboard h 2 6 type s drywall screws 12 o c.

2 fire rated wood frame wall and floor ceiling assemblies. Fire resistance ratings time temperature include structural elements and everything above including the roof membrane and its surfacing. Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. Sheathing on both sides.

If trusses are specified then these assemblies can be used to achieve the desired fire rating as long as all the details of the assembly requirements are met. Elements of buildings the fire resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire resistance rated walls ceiling and floor assemblies. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.