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.
How to insulate an outside bathroom wall.
To do that lay a batt on the floor in.
Handy homeowners can rent an insulation blower and drill holes in the wall above the shower to blow in fiberglass or cellulose insulation.
Tuck the insulation into the cavity snug against the top of the stud bay and edges flush with the.
When moisture becomes trapped in walls mold and mildew can grow damaging your home and presenting a potential health danger.
Install vapor barriers after the bathroom s plumbing electrical and insulation are complete.
The outside wall in my bathroom has old plaster and lathe covered by old fashioned thin printed paneling.
Use the discarded material to fill gaps nooks and crannies.
Use special airtight electrical boxes see photo tip 5 or seal the poly to the electrical box with acoustical sealant.
Buy unfaced friction fit batts and seal the walls with a 4 mil poly vapor retarder.
Press the poly into the sealant.
For narrow stud bays you have to trim down the batt s width.
When you reach the end of the wall cut off the insulation.
Bathroom projects need special consideration because of the humidity and moisture that bathrooms generate.
Proper insulation will help keep your bathrooms a comfortable temperature year round.
I dont know if i should tear out the plaster and lathe or cover it up and how to keep the winter cold from causing problems.
Steps on insulation installation 1.
One hole per stud space is necessary.
It s also a relatively easy option for diyers.
Plastic sheeting is used because of its low level of water permeability.
The ceiling needs redone as well so the wall.
Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk.
To add soundproofing weave a continuous roll of fiberglass insulation between staggered studs using insulation designed for 2x4 walls.
Weave loosely to fill the cavity but tightly enough so you won t have to compress the insulation when you install drywall.