Published on April 7th, 2014 | by Henri0
Cellulose insulation has settled and shifted
Q. After an addition was completed to our house, I went up into the attic to check some wiring. I noticed that it appeared that the blown-in cellulose insulation has settled a lot from when the house was originally built in 1987. There are also several areas where it looks like the building of the addition allowed wind to blow the insulation out of the corners as it is very thin there.
The roof has a ridge vent and there are soffit vents. We noticed last winter a couple of the bedrooms seemed colder than usual. How deep should the blown-in insulation be? I’m planning to rent the equipment and add to it myself. Also, I noticed several of the foam panels that are used to keep the insulation from blocking the soffit vents now have insulation between them and roof sheathing. I’ll bet you’ll say I should clear them while I’m at it!
A. Blown-in cellulose will settle over time. It is also possible that the areas where the insulation is thin have been affected by the wind blowing through the soffit vents, as the foam baffles you refer to may not seal the space between the walls’ top plate and the bottom of the baffles at the rafter seats.
You should definitely remove any insulation that is over the baffles. Adding more cellulose to achieve a greater R-factor is a good move; the recommendation for the R-factor has been increased over the years as energy prices have gone up and we are becoming more conscious of our imprint on the planet.by