I'm helping my daughter replace the deck boards, posts and balusters on her deck. That leaves the rim joists, posts and stair stringers that will be...
RE: doubling the joists at joints, could a 2x4 just be sistered to the existing joist since all you're looking for is a sure to screw the deck board...
If it were my deck I'd consider composite but it's for my daughter's house. FWIW, composite is about 4 times the cost of pressure treated at Lowes &...