Over the cavity you can always stuff it with batt insulation irc 302 1 1 2 this fur down around the air duct needs fire blocking installed in the wall cavity so that fire cannot go up inside the wall and into the duct cavity.
Fire blocking with batt insulation.
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R302 11 1 3 loose fill insulation material.
The easiest way we ve found to fire block this spot is to butt a continuous 2x8 to the mudsill letting it overhang the foundation wall.
Unfaced fiberglass batt insulation used as fireblocking shall fill the entire cross section of the wall cavity to a minimum height of 16 inches 406 mm measured vertically.
Fireblocking unfaced fiberglass batt insulation used as fire blocking shall fill the entire cross section of the wall cavity to a minimum height of 16 inches measured vertically.
Where piping conduit or similar obstructions are encountered the insulation shall be packed tightly around the obstruction.
Unfaced fiberglass batt insulation used as fireblocking shall fill the entire cross section of the wall cavity to a height of not less than 16 inches 406 mm measured vertically.
How to finish an unfinished garage.
Best seller owens corning thermafiber fire and sound guard mineral wool insulation batt 15 in.
Model sg 25 p3 15 47 221 view the owens corning home comfort solutions.
Step 3 fire blocking stairways.
Rockwool safe n sound rockwool s popular stone wool fire and acoustic batt insulation is now offered in a new 6 thickness.
If you can t get wood blocking or o s b.
When piping conduit or similar obstructions are encountered the insulation shall be packed tightly around the obstruction.
Best seller owens corning thermafiber fire and sound guard mineral wool insulation batt 15 in.