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.
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.
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.
How do you protect electrical wires in the attic?
Where run across the top of floor joists, or within 2.1 m (7 ft) of floor or floor joists across the face of rafters or studding, in attics and roof spaces that are accessible, the cable shall be protected by substantial guard strips that are at least as high as the cable.
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.
Can you install insulation yourself?
With certain types of insulation materials, installing your own insulation is definitely doable—and you can save money not hiring a professional. Installing fiberglass or mineral wool insulation are simple DIY projects. Other insulation types, such as spray foam insulation, require the use of a professional.
Does it matter which way insulation faces?
(The general rule for insulation is that the facing always goes toward the conditioned space.) The second layer of insulation should be unfaced so that moisture doesn’t collect between the layers.
What is the best way to insulate exterior walls?
One way to insulate walls of an old house is to focus on the home’s exterior:
- Apply a house wrap/vapor barrier to exterior walls.
- Attach 1-inch foam board insulation.
- Install siding over the insulation.
- Replace old windows with energy-efficient units.
- Caulk window trim and use weatherstripping to reduce air leaks.