1 Hour Rated Roof Assembly Residential

The lower roof assembly within 4 feet 1220 mm of the wall has not less than a 1 hour fire resistance rating and the entire length and span of supporting elements for the rated roof assembly has a fire resistance rating of not less than 1 hour.

1 hour rated roof assembly residential. Assemblies include ducts dampers lighting or other fixtures in the tested assembly. Assemblies are provided in. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

Two layers 5 8 15 9 mm densglass fireguard sheathing applied vertically to min. Base layer attached with 1 25 mm type s 12 corrosion resistant bugle head screws 8 203 mm o c. See full report for details. Openings in the roof shall not be located within 4 feet 1220 mm of the fire wall.

No minimum joist size is given except that it needs to be adequate for structural loads. These listings are short summaries to serve as a. Ibc section 722 6 could be used to calculate up to a 1 hour rating for a wood frame wall floor or roof assembly. Generic fire rated assembly listing construction elements 1 5 hr rating 1 hour notes 1.

Table 1 for one hour rated wall assemblies and table 2 for two hour rated wall assemblies. 6 usg fire resistant assemblies test certification test conditions and fire and sound tested assemblies listed in this selector are based on characteristics properties and performance certificationof materials and systems obtained under controlled test conditions as set forth in the appropriate astm standard in effect at the time of test. 3 1 2 89 mm corrosion resistant 20 gauge 30 mils steel studs 24 610 mm o c. American softwood lumber standard ps 20.

For example shake roofing with a fire retardant treatment rates class b on its own but achieves a class a rating when combined with specified underlying materials such as type 72 roll roofing material. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. A minimum 1 hour fire resistance rating to prevent embers and hot gases from making contact with the joists rafters or trusses or the underside of the roof decking. Ibc table 722 6 2 2 allows 10 minutes for wood floor or roof joists at 16 o c.