A: GWC44, This plywood siding is manufactured by Georgia-Pacific.
A: George, You may use T1-11 for walls as it is not pressure treated.
A: Contractor, The width of the groove are 3/8 " (tolerance +/- 1/32") We achieve the 4" o.c. by measuring the middle of each groove to the middle of the adjacent groove. That is a standard pattern for APA plants.
A: Claudio, The average weight of 19/32 siding is 52 lbs. per board.