How to Install Dense-Pack Cellulose

1. Net the Framing Cavities Netting is stretched tight between framing members to minimize bulging of the cellulose. A pneumatic upholstery stapler—which continuously spits out fasteners as long as the trigger is depressed—speeds the job along but requires an experienced operator.

2. Blow the Cellulose The hose nozzle is inserted into the netting, pushed to the bottom plate, and withdrawn as the cavity is filled. Once the cavity has been filled to the insertion point, the nozzle and hose are pushed to the top plate and the rest of the cavity is filled from the top back to the middle.

3. Flatten the Surface Take the time to compact the filled cavities with an aluminum roller. If this step is omitted, any bulging of the netted insulation between studs will put pressure on the drywall, eventually causing the screws to pull through its paper facing. A quick pass of the hand is enough to confirm that the insulation lies flush with the framing.

4. Air-Seal Band Joists Dense-pack is an effective air barrier, and in the hands of a skilled installer it can be successful in areas that might otherwise call for spray foam. Here, netting has been carefully stapled between the joist ends and filled with cellulose to form insulating and air-sealing “pillows.”

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