Ther batt or loose fill to any 1 or 2 hour fire resistance rated floor ceil ing or roof ceiling system having a cavity deep enough to accept the in sulation is permitted provided that one additional layer of either 1 2 inch or 5 8 inch type x gypsum board is applied to the ceiling.
1 hour rated roof assembly.
Ibc table 722 6 2 2 allows 10 minutes for wood floor or roof joists at 16 o c.
The addition al layer of gypsum board shall be.
Is this possible without using channels and what ul number would i use.
Ul does not appear to list an assembly as described.
Ibc section 722 6 could be used to calculate up to a 1 hour rating for a wood frame wall floor or roof assembly.
See full report for details.
No minimum joist size is given except that it needs to be adequate for structural loads.
Helpful documents and resources for usg s roof assemblies can be found on this page.
Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c.
I would like to apply the drywall directly to the bottom of the truss and also have insulation for sound control.
Refer to our roof ceiling assembly documents which includes ul fire rated roof assemblies for easy guidance through the assembly of a roof or ceiling on your next project.
In fact there is no.
Ibctable 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses.
With 1 2 wood structural panels with exterior glue applied at right angles to top of joist or top chord of trusses with 8d nails.
Report number 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.
Face layer attached with 2 3 8.
I am looking for a 1 hour roof ceiling assembly for wood truss construction.
Assemblies include ducts dampers lighting or other fixtures in the tested assembly.
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