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Hi all, I have a question on the insulation in my heated garage/workshop. Right now in the ceiling I have R-19 (6.5") of fiberglass roll insulation and I want to bring it up to about R-40 or so. Can I just blow in insulation right over the fiberglass or should I add more fiberglass roll insulation instead. I have already put soffit baffles in so I am good to go there. Thanks all in advance.
 

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Done all the time and works fine.
It's so light it's not going to compress the batts.
Air seal any holes first where any lights or wiring was run through the plates and ceiling.
 
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