Hang Conduit Below Roof Trusses

Compromised trusses can lead to severe structural problems such as bowing exterior walls sagging ridge lines and roof collapse.

Hang conduit below roof trusses.

A pdf illustrating the basic strategies for connecting unistrut to bar joists is also available for download by clicking here. R802 7 cutting and notching. The notching and boring rules for rafters are much different than the rules we ve learned for joists and studs. Truss t hanger is the new industry standard for hanging pipe electrical hvac fire suspension and more in open web bar joist.

Truss t hangers are shaped like a t and unlike traditional hanging systems are installed by going through the middle of the truss and then being locked into place by a coupling device. The good news is that we illustrate 3 time tested techniques for connecting unistrut channel to bar joists below which means you can choose the strategy that best suits your specific needs. The mc cable is 7 16 thick the space between the top of the truss and the roof is 1 1 2 2x4 on its side minimum space per the nec is 1 1 4. Since mc cable can t be bent sharply minimum bend radius of 7x the cable diameter i was going to go under the top truss member and put a mc strap on.

Preparing roof trusses for hanging dry wall poses no particular difficulties but you need to understand the strength and stability limitations of drywall and plan your work accordingly. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses. Putting up runners or furring strips beforehand and planning for that in the design of the roof will usually solve the problem. Screw down the panels using the pre drilled holes then continue across the roof until it is completely covered.

If dead loads must be hung from trusses then extra support can be provided by installing support beams perpendicular to the trusses reducing the span of the bottom chords and increasing their ability to carry the weight load. Pipe truss and all of the equipment used to hang stuff from the building s structure is collectively called rigging and is one of the unsung heros of the lighting industry. If metallic conduit or wiring needs to be placed near the roof assembly nrca recommends it be positioned and supported at least 11 2 inches from the bottom side of the roof deck or substrate to which the roof system is applied. Here s your code on rafters and trusses.

It s part of the primary infrastructure of a lighting system and one of the unseen expenses of the system as well as one of the most dangerous parts. Structural roof members shall not be cut bored or notched in excess of the limitations speci fied in this section. I want to go under the top member of the truss.