replying to bowgus, DIYDon wrote:
Hand fluffing and pouring is do-able and effective for a few stud cavities,
but cellulose will not pour into a 3/4 inch gap due to friction. What will
pour though are small (approx 1/8 inch diameter) styrofoam balls, often sold
by fabric stores or on line projects like pillows. The R-value is not as
high, but it will make a noticeable difference. Take a look at an energy loss
vs R-value chart and you will see the huge effect when you are starting with
very low R-values and adding to it.

--
for full context, visit https://www.homeownershub.com/mainte...ne-139023-.htm