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Blown in celulose has fallen out of popularity in my area. In the past, it was always installed in a “loose pac” fashion with no effort made to compress it. Complaints were: 1) after 2-3 yrs, what was installed as 12″ had settled to 10″ or so. 2) wall installations settled as well leaving voids. 3) It was a mess in the attic as far as service was concerned. At times we put in a cat walk in the truss webs and also raised electrical J-Boxes above the muck.
The celulose installation equipment sits idle now and FG is installed instead. My installer tells me that he “densely packs” the stud bays by putting a material (that will let the installation air escape) on the interior side and he packs the space tightly with the blown in fiberglass. FYI, $0.44 for a R-19 batt installed and $0.72 for the blown in stuff. My questions are, how effective is the DP FG method. What is sacraficed by using this method over dp celulose? Is the old celulose blower capable of dense packing walls if used differently?
As for the horizontal attic space. My choices are 1) Batts 2) Blown in and ever so loosely packed Fiberglass 3) Blow in cells the old fashioned way 4) A combination?
Through reading other posts regarding air barriers, insulating, venting, sealing, etc., (I am hooked and appreciate the incredible amount of info discussed here) my guess is that the cells would do the best job over a tightly sealed ceiling. Settling is expected and would be acceptable.
Your Thoughts? Thanks
Replies
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Blown in celulose has fallen out of popularity in my area. In the past, it was always installed in a "loose pac" fashion with no effort made to compress it. Complaints were: 1) after 2-3 yrs, what was installed as 12" had settled to 10" or so. 2) wall installations settled as well leaving voids. 3) It was a mess in the attic as far as service was concerned. At times we put in a cat walk in the truss webs and also raised electrical J-Boxes above the muck.
The celulose installation equipment sits idle now and FG is installed instead. My installer tells me that he "densely packs" the stud bays by putting a material (that will let the installation air escape) on the interior side and he packs the space tightly with the blown in fiberglass. FYI, $0.44 for a R-19 batt installed and $0.72 for the blown in stuff. My questions are, how effective is the DP FG method. What is sacraficed by using this method over dp celulose? Is the old celulose blower capable of dense packing walls if used differently?
As for the horizontal attic space. My choices are 1) Batts 2) Blown in and ever so loosely packed Fiberglass 3) Blow in cells the old fashioned way 4) A combination?
Through reading other posts regarding air barriers, insulating, venting, sealing, etc., (I am hooked and appreciate the incredible amount of info discussed here) my guess is that the cells would do the best job over a tightly sealed ceiling. Settling is expected and would be acceptable.
Your Thoughts? Thanks