Proper insulation will help keep your bathrooms a comfortable temperature year round.
How to insulate an exterior wall in a bathroom.
Use special airtight electrical boxes see photo tip 5 or seal the poly to the electrical box with acoustical sealant.
The batt should not be tightly compressed against the studs.
That will reduce its r value.
Press the poly into the sealant.
Buy unfaced friction fit batts and seal the walls with a 4 mil poly vapor retarder.
Handy homeowners can rent an insulation blower.
Liquid barriers may also be used to prevent moisture from getting into the walls.
Add soundproofing to add soundproofing weave a continuous roll of fiberglass insulation between staggered studs using insulation designed for 2x4 walls.
Tuck the insulation into the cavity snug against the top of the stud bay and edges flush with the studs.
Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk.
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.
Place the insulation slabs or batts inside the wall cavity between the studs.
Weave loosely to fill the cavity but tightly enough so you won t have to compress the insulation when you install drywall.
Install vapor barriers after the bathroom s plumbing electrical and insulation are complete.
They are painted on surfaces and form a waterproof seal over drywall.
Bathroom projects need special consideration because of the humidity and moisture that bathrooms generate.
In an older home there s a good chance that no one insulated the exterior wall before installing the shower.
When you reach the end of the wall cut off the insulation.