Installing Rockwool Safe and Sound wall insulation

[@theowaltz7386]

Thanks for the video. It is great for novice DIYers, such as myself.

[@umeradil]

Do i need two layers of batt or one is enough .. my basement joist is 9" deep (below upper subfloor).. if need 2 layers, then both layers should be touching each other..? (Ontario, Canada)