How To Insulate An Exterior Wall In A Bathroom

Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk.

How to insulate an exterior wall in a bathroom.

In an older home there s a good chance that no one insulated the exterior wall before installing the shower. Bathroom projects need special consideration because of the humidity and moisture that bathrooms generate. There are two ways to fix this problem. Tuck the insulation into the cavity snug against the top of the stud bay and edges flush with the studs.

For an accurate fit against the bottom of the cavity let the insulation run long then cut it against the bottom plate of the wall framing with your utility knife. The batt should not be tightly compressed against the studs. That will reduce its r value. Press the poly into the sealant.

When you reach the end of the wall cut off the insulation. Place the insulation slabs or batts inside the wall cavity between the studs. When moisture becomes trapped in walls mold and mildew can grow damaging your home and presenting a potential health danger. Use special airtight electrical boxes see photo tip 5 or seal the poly to the electrical box with acoustical sealant.

Proper insulation will help keep your bathrooms a comfortable temperature year round. If the whole batt cannot fit inside the cavity cut off the excess material with a scalpel knife leaving a couple of centimeters over on each side to ensure a tight fit. Add soundproofing to add soundproofing weave a continuous roll of fiberglass insulation between staggered studs using insulation designed for 2x4 walls. Handy homeowners can rent an insulation blower.

Weave loosely to fill the cavity but tightly enough so you won t have to compress the insulation when you install drywall. They are painted on surfaces and form a waterproof seal over drywall.