Wood Truss Roof Assembly Ul

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.

Wood truss roof assembly ul.

Topics will also include distinctions between fire resii l f i fistive elements for separation vs. Hayward building systems located in santa maria ca manufactures quality plated wood trusses for residential multi family and commercial projects. Hayward uses only high quality lumber and precision automated saws and assembly equipment to produce roof trusses for any style and size of roofing system. In fact there is no tested assembly that matches in all regards.

Steeper roof pitches require longer webs which add to the cost. U the truss depths and lumber sizes listed are minimums. Both of these assemblies were developed using the component additive method cam which adds up the known fire resistance of each of the assembly elements to determine the resistance of the whole assembly. O c fabricated from nom.

2x4 lumber oriented vertically or horizontally. Pitched or parallel chord wood trusses spaced 24 max. Ul does not appear to list an assembly as described. Deeper trusses and larger lumber sizes aid in fire endurance and are therefore permitted.

Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr. The wood structural panel thickness shall not be less than nominal 1 2 nor less than required by chapter 23. U rated assemblies with parallel chord trusses in floor ceiling applications may also be used for roof ceiling applications as long as the minimum depth at end bearing is maintained. Related to assembly selection for required fire resistance rated floor ceilings and roof ceilings interior and exterior walls fire barriers fire partitions and fire walls.

Roof slope of 3 12. If we go any larger it will require more webbing inside the truss which will directly affect the cost of the truss. Screw fastened perpendicular to lower chord of wood trusses of 2 x 4 38 mm x 89 mm. Fire resistant design for wood construction.

Truss depth shall be 5 1 4 with a min. However it is identical to ul l538 with the exception that l538 uses i joists instead of wood trusses. For details about rated truss assemblies see sbca research report 1509 01. The reluctance to rely on approved test results is unwarranted as explained in section 17a and section 17b of sbca s metal plate connected wood truss handbook.

This 26 span truss with a 4 12 roof pitch is the most economical truss we can build. Fire resistance rated truss assemblies. Does the minimum depth requirement of the parallel chord assembly apply to the minimum depth of a sloped roof truss i e heel height answer. Is this possible without using channels and what ul number would i use.

Ul p533 roof ceiling one layer 5 8 15 9 mm fire shield c ga rc 2603 wallboard attached to 1 2 12 7 mm resilient furring channel spaced 12 o c. Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c.