Some decks are designed with a joist orientation parallel to the house. This is useful in cases where you do not want to hang framing members from the house wall in the case of a brick or stone surface or if the house wall cannot adequately support the framing such as with a house cantilever.
In order to rotate the joist’s typical direction you will need to install beams that project perpendicularly out from the house. You may need to install a post and footing next to the house or even consider cutting into the house to support the beams in some cases. Because the joists will be running parallel with the house you should understand that your decking orientation will be affected.
You will no longer be able to install the decking parallel to the house because the decking must run over the tops of the joists for support. You will need to either install your decking in the opposite direction of the joists or install the decking at a 45-degree angle.