Rigid Foam Insulation Electrical Wiring

Unfold the paper tabs running along the length of the batt.

Rigid foam insulation electrical wiring.

Standard one half inch sheet rock will follow. They re not knob and tube. What do i do about the wiring in those wall cavities. Push the insulation batt back into the wall with the cut line aligned with the electrical wire.

If your home was wired using a now obsolete methodcalled knob and tube wiring the national electric code forbids the installationof loose rolled or foam in place insulation if the insulation would surroundthe wires and prevent heat dissipation from the electrical conductors to a freeair space. With my friend s basement i plan to use grooved 1 or 1 5 rigid foam board. Is it safe to encase them with insulation. I m thinking about adding 2 inches of rigid foam over the studs leaving the fiberglass in place.

After the wiring is in place the insulation can be laid in. I will secure the foam board on to the poured concrete slab walls with 1x3 furring strips via a powder actuated gun and drive pins. Nema approved wiring is compatible however it may be necessary to run speaker wiring network cabling and other services after foam is applied to avoid problems with unrated wiring. There are outlets in the knee walls so wires will have to penetrate somewhere.

Most homes are insulated using batt or roll insulation. With this approach my big question is. As it is industry groups have conducted several decades of extensive testing finding that spray foam insulation does not affect electrical wiring when safely applied and installed. Other options such as spray foam or loose insulation are also a possibility but in all cases the insulation needs to be installed after the wiring is done.

Mask the front of all electrical boxes panels and equipment to avoid foam migration into unwanted areas. This is for fire safety.