Can you notch a rafter?

Floor or Ceiling Joist A notch not exceeding 1/3 the depth of the member is permitted in the top of a rafter or ceiling joist not further from the face of the support than the depth of the member. The tension side of members 4″ or greater in thickness must not be notched except at the ends of the members.

Can you run wire through rafters?

Yes, you can run cable through bored holes in the joists if that’s what you prefer.

How do you secure wires to joists?

Electrical staples are approximately 1/2 inch wide and can be attached with a hammer to hold the wire in place beneath the joists. The best way to install an electrical staple is to put the prongs on either side of the wire and tap gently with the hammer, stopping before the staple compresses the wire.

Can you notch the bottom chord of a truss?

1) Bottom chords of trusses are in tension only. So, notching the member does not affect the “bending moment” because it’s not in bending. A 2×6 bottom chord is extremely large. Most are 2×4’s.

How much does it cost to notch a rafter?

The two International Residential Code (IRC) standards that apply to cutting a birdsmouth in a roof rafter are: 1) “Notches at the ends of the member shall not exceed one-fourth the depth of the member” (IRC R502. 8.1). That would be a max of 1-3/8” for a 2×6, 1-3/4” for 2×8, 2-1/4” for 2×10 and 2-3/4” for 2×12.

How much can you notch?

You can cut a notch at the end of the joist to 1/4 of the joist’s depth (maximum). Along the outer third of a joist, you can cut a notch a maximum of 1/6 the joist depth and 1/3 the joist length without compromising its strength.

Can you run Romex across rafters?

If you can run it across by stapling it to the rafters, you can avoid the insulation thing. If the attic is inaccessible, you have less a worry about protecting the wires than you would if it were a storage area. Do not drill them through the joists or rafters.

Can you notch roof trusses?

Notching on those trusses would not be allowed without written exceptions and specific instruction (maintained on site) from the AOR (or EOR) who designed the cuts into them… IRC 802.10. 4 and UBC 2320.1 calls out no field modification except with engineer approval.