16" oc is gonna be a bit springy with the synthetic products. if you read the fine print in their installation guide, they recommend 12" oc to improve rigidity.
that said, for a covered porch, i'd just go with PT and stain/seal as needed down the road.
Collector of the LS powered Chebby soccer mom coach.
Last edited by WTF?; 11-15-2019 at 02:30 PM.