I recently purchased a 1960 ranch with an attic that has about 3-6" of batt insulation with vapor barrier...2x6 rafters where some of the insulation has been compressed to 3+"....furthermore 3/4 of the attic had been and still is covered with 3/4" plywood for storage.....my question is since fiberglass insulation works to slow heat transfer by the principle of slowing air movement....does it make sense to just plywood the remaining areas and seal the top side (seams) of the plywood???....the batts have a vapor barrier on the warm house side (bottom).....I would be able to get 6" of insulation underneath the plywood...not the depth needed to obtain the recommended R value of 39 (in NJ) but it would stop air flow....or I could tear up all the plywood fill the remaining 3" in spots and run batt perpendicular to the joists at 11" depth to give the R-39....the complicating factor is that I have a whole house fan with two (2) large louvered vents 36"x36" on each gable end and therefore would disrupt any insulation placed close to the 36" fan mounted inside one of these gable louvers. Any suggestions?....the large vents coupled with the fact the fan is mounted to the gable end vent instead of the ceiling vent of the house there are NO soffit vents.
Any ideas or suggestions would greatly be appreciated.
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