1 Hour Roof Construction

One hour roof ceiling assembly.

1 hour roof construction.

To an imaginary line between two buildings on the lot. 1 hour rating category illustration construction 24 oc min 18 depth resilient channel 16 oc 1 layer 5 8 type c gypsum sheathing min 15 32 ul l546 floor or roof with damper duct fixtures insulation and metal trim note 1 ul l550 pitched roof with duct or damper and insulation note 1 24 oc min 18 depth resilient channel 12 oc. 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. Some building jurisdictions now require a fire watch for a minimum of one hour after the last roofing torch has been extinguished.

Ibc section 722 6 could be used to calculate up to a 1 hour rating for a wood frame wall floor or roof assembly. The section details the procedures for calculating fire resistance of walls floor ceiling and roof ceiling assemblies. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. Is this possible without using channels and what ul number would i use.

Both are burn through tests and the ultimate roof systems rating is the lowest of the three tests. To the closest interior lot line. The brands consist of an ignited wood lattice placed directly on top of the test specimen. Wall framing whichever is closer to one of the following.

During construction there are many opportunities for accidental ignition including welding of steel and the use of torches on modified bituminous roof membranes. I am looking for a 1 hour roof ceiling assembly for wood truss construction. I would like to apply the drywall directly to the bottom of the truss and also have insulation for sound control. To the centerline of a street an alley or public way.

Walls less than 5 feet from the property lot line must be of a listed hour fire1 resistant construction. No minimum joist size is given except that it needs to be adequate for structural loads. What you ll eventually learn is that the easiest place to design your own 1 hour assembly is section 721 6 of the international building code. The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams.

Ibc table 722 6 2 2 allows 10 minutes for wood floor or roof joists at 16 o c. Our range of drawings can help pros plan projects more effectively by utilizing designs for a fire rated ceiling assembly.