Rigid Foam Insulation Electrical Wiring

If it is a colder climate then typically a minimum insulation thickness of r 10 to r 11 is required.

Rigid foam insulation electrical wiring. Spray foam insulation is generally used in most modern houses to provide protection against very hot or very cold conditions by keeping the temperature inside at a tolerable level. While there may be debate between individual contractors about spraying foam insulation over electrical wires industry guidelines state that spray foam insulation can be applied directly over electrical wiring. 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. Add to that a 3 4 furring strip thickness and it would be not only less costly to install a framed 2x4 wall with r 11 fiberglass batts without adding significant thickness to the overall wall.

Air tightness is important so any slots or holes need to be sealed. 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. Unfold the paper tabs running along the length of the batt. Can foam polyurethane caulk are both pretty good.

Insulation after the wiring is in place the insulation can be laid in. One downside to having spray foam insulation is that it is hard to perform any modifications like adding new electrical wiring and outlets once it is installed. Most homes are insulated using batt or roll insulation. Push the insulation batt back into the wall with the cut line aligned with the electrical wire.

When rigid foam insulation boards are used to insulate the walls of anunventilated crawlspace they can be bonded to the wall using recommendedadhesives. Mask the front of all electrical boxes panels and equipment to avoid foam migration into unwanted areas. It s safe to run romex and other sheathed wiring in contact with rigid foam.