Never mash fiberglass batts to fit under or around a pipe or electrical cable. … Don’t compress the insulation to fit behind pipes or wires. Instead cut to the middle of the batt’s thickness so you have a flap under the wire and one over the wire. Insulation is installed over NM cables all the time without problems.
Can you cover electrical wires with insulation?
Can you lay insulation over electrical wires in an attic? – Quora. Yes. – These are any junction boxes that are there just to join wires and make splices that have a cover so wires and connections are accessed only from the attic.
Do you put insulation over or under wires?
Wiring should be installed before any insulation. When building a home, everything needs to be done in the correct order. For instance, after the framing is complete and the exterior walls have been put up, you need to consider the inside of the wall cavities before you drywall the interior.
Can you lay insulation over electrical wires in attic?
Don’t step on any cables or wires in the attic. … Insulation in contact with the wires can cause it to overheat and start the black wire insulation on fire. You also need to be on the lookout for any older recessed lighting fixtures. Many of these can have wires that feed them that can catch on fire if they overheat.
Can you put fiberglass insulation over electrical wires?
Never mash fiberglass batts to fit under or around a pipe or electrical cable. … To insulate around an electrical box, split the insulation so you can loosely tuck some behind the box and then carefully cut the remaining insulation around the box.
What is the proper way to install faced insulation?
Regardless of whether fiberglass insulation is installed in a wall, attic, or crawlspace; the paper facing should always face toward the inside of the home. That’s because the paper contains a layer of asphalt adhesive which prevents water vapor from passing through it.
Is it OK to have a junction box in the attic?
The primary requirement for junction boxes is that they remain permanently accessible. … However, the accessibility requirements do not prohibit you from installing a junction box in the attic. A common solution to accessibility problem is to have the box open to the underlying room’s ceiling.
How do you run electrical wires in the attic?
If you’re going through the attic, use the spade bit to drill a hole through the top plate, directly above the new electrical box location. If you’re running cable through a basement or crawlspace, drill a hole in the bottom plate directly below the box.