These angled joists are hung flush with built-up beams creating a lower profile than a traditional platform system would allow. The ledger is bolted through a structural cladding onto a rim joist, sill top, or bottom plate. It is important that these points be protected. Chad Wichers Spacers set between the ledger and the flashing allow air circulation and water drainage. Spacers between the wood members allow water to drain and air to circulate, reducing the potential for decay.
Ties provide greater strength than toe nailing.
The advantages of a double joist system are water drainage and air circulation through the joists and between the decking at the critical end grain edges. Also, the decking can be nailed away from the ends of the deck boards, eliminating splitting at the ends.