going to roll out attic insulation between the ceiling joists. what do I do when I come across wires that go through the joists? Can I roll the insulation over the wires or should I cut it and leave the wire exposed and start the roll again on the other side of the wire?
There are some people that shouldn't give advise if they don't know what they are talking about. Please, please don't ever cover an electrical wire with insulation. Jim W is right on! Heat will destroy electrical wire. The NEC's acceptable method of workmanship manner is to (actually) take the time and PULL the insulation under the wire.
Electrical Wire Insulation
yep ,you guys got the answer ,wall s got it right with cutting the insulation a foot longer than where the wire is ,but only put it under the wire tape the join if required, will stop the ends curling up leaving a gap. p.s. don`t cut the wires .
Heat is the enemy of the insulation on electrical wires. When you put insulation over the wires, you cause the wires to get warmer, this increases the resistance of the wires which then causes line loss or also known as voltage drop. Cut the insulation or put it under the wires, then tape any cuts with the wire exposed. This is the proper way to do it. Most insulators, just roll it over the wires, but it will change the amp rating of the wires. This may or may not be a problem.
The best way is to cut the insulation a foot longer than the distance to the wire, then split the insulation so that it goes above and below the wire. Start a new piece of insulation tucked tight to the last. If you fill up the bays, and you could use more insulation go at right angle to the first layer.more is better
