Hang Conduit Below Roof Trusses

R802 7 cutting and notching.

Hang conduit below roof trusses. Compromised trusses can lead to severe structural problems such as bowing exterior walls sagging ridge lines and roof collapse. I want to go under the top member of the truss. 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. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses.

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. 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. Also hangers or other supports used to attach and support metallic. 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.

Notches in solid lumber. 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. A pdf illustrating the basic strategies for connecting unistrut to bar joists is also available for download by clicking here. 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.

Putting up runners or furring strips beforehand and planning for that in the design of the roof will usually solve the problem. 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 notching and boring rules for rafters are much different than the rules we ve learned for joists and studs. Conduit or wiring be embedded within roof assemblies or placed directly below roof decks.

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. Here s your code on rafters and trusses. Truss t hanger is the new industry standard for hanging pipe electrical hvac fire suspension and more in open web bar joist.