Every insulation has a different R value. It ultimately is determined by which insulation you will be using. Now lets do rough estimate. 4" thick, regular fiberglass mat has R-value of 13. Assuming that plywood has the same to half the insulating value of fiberglass, 1/2" plywood would have 1/8 to 1/16 of R-value of that 4" mat. Roughly R-1.6 to R-0.8
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Read your governing documents to determine the line where your private ownership ends and common ownership ends.If it is common area:Owners (plural) maintain the attic area, this is proper, since it's possible that the attic is common area.Owners (plural) own the attic, it is subject to preventative maintenance, regular inspection and so forth.Owner (singular) maintains the attic area, that individual owner may be encroaching on real estate assets that belong to all the members.If it is private area: Owner (singular) actually owns the attic and it is not common area, the governing documents may require that this owner maintain the attic to some standard.If it is common area, by definition, and is used (maintained) by a single owner, the largest issues have to do with fire hazards, liability, and privilege.
To find the square footage of an attic, you first need to measure the length and width of the attic space in feet. Next, multiply the length by the width to calculate the total square footage. For example, if the attic is 20 feet long and 15 feet wide, the square footage would be 20 x 15 = 300 square feet. This calculation will give you the total area of the attic in square feet.
The Attic talent, as a weight, was about 57 lbs.
Calculate attic square footage, calculate how much free area you need by dividing the attic square footage by 300. Convert the square feet needed to inches. Split the amount of free area needed equally between the intake and the exhaust. Divide that by 60, for how many vents you'll need.