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Re: Layered fiberglass batt different R value than loose fill ?
Yes, loose fill has a lower R-value per inch than batts, at least from the insulation I have seen.
Also loose fill insulation settles and the R-value is given based on placement depth, not settled depth (as I recall).
The R-value varies depending on the manufacturer, not all loose fill fiberglass insulation has the same R-value. Most loose fill insulation is rated on square feet per bag, which is translated into depth, but it is really the amount of insulation (number of bags) spread out over a specified square foot area.
I would measure the depth, take a photo of the depth, and do so at the lowest areas and at the highest areas, which will show inconsistency in application and document with photo the lowest thickness encountered.
I would report the thickness, not the R-value, unless you know the brand of insulation and their depth for R-value, and even then it may have been 'stretched out' and blown lightly to the minimum depth without using the proper number of bags for that area, resulting in less R-value than the depth would indicate.
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