Thank you for the question and the great images showing the type of settlement problem you are experiencingwith your cellulose wall insulation.
I am including two similar images (below) so you know that this is a fairlycommon problem with this type of insulation system.
Let it dry out
Cellulose insulation is hygroscopic, meaning that moisture is dispersed throughout the material preventingwater from accumulating in any one area.
- Cellulose insulation is able to hold many times its weight in moisturewithout reaching its fiber saturation point. This added weight can lead to settlement.
- Wet spray cellulose shouldnot be sprayed at more than 40% relative humidity.
- Under the right conditions it may dry to 11% RH within 24hours.
While additional settlement is possible it isn't likely if the insulation was allowed to "dry" out before it wascovered.
Cellulose was a good choice
You made a good decision to go with cellulose insulation for your wall system. Its density will reduce convectiveheat transfer outperforming fiberglass blanket or spider systems.
Repairing the settled cellulose by stuffingfiberglass into the gaps allowed you to move forward without significantly reducing the performance of the wallinsulation system (we are talking a minimal percentage of the overall wall system).
So rest easy; this problem is not worth worrying over.
For more information:
Read Lily Livingston's Q&A "Doesn't sprayed cellulose insulation tend to settle, leaving areas in the wall where there is no insulation?"