Ok, let me ask a different way. If the Simpson chart shows allowable downloads of 1000 using the 1/4" x 1 1/2" SDS screw, than using these 1 1/2" screws will be fine, even if the 4x lumber can accommodate a longer screw. Meaning... no need for a screw longer than 1 1/2", because that screw is enough to support the loads listed in the chart. Am I correct in that? Makes sense to me. I think I'll just get the 1 1/2" screws.

 

They have done the engineering. But I can't figure what you have with the angles cut on the stringers in the picture.

 

Thanks, Neal. I will just grab the recommended 1.5" fasteners.
Those stringers do look odd on the floor.
I made a 2x12 templet on site for the stringers (the 2x12 in pic)
They are cut to connect like in this quick pic I just put together.
Doubled 2x hung on 6x posts. Fascia 2x will install between stringers above top step.

 

Thanks, Neal. I will just grab the recommended 1.5" fasteners.
Those stringers do look odd on the floor.
I made a 2x12 templet on site for the stringers (the 2x12 in pic)
They are cut to connect like in this quick pic I just put together.
Doubled 2x hung on 6x posts. Fascia 2x will install between stringers above top step.

Yeah I got that, it was just likely the angle of the photo but the bottom angle didn't look right. Will you be cutting the nose off them at the bottom.?

 

Ahh. These stringers will be set 1 7/8" past the outside of the 6x posts. You can see that in my illustration. They inset and rest at the doubled 2x beam. I suppose I could use timber screws and lag through inside of stringers and into the posts. Kinda toe nail them into the posts... but with longer timber screw, as the stringers are 4x.

Hmm... will have to think about this one.

 

Does the bottom landing have footings under it? They are required in some places.

 

Hi, Guap0. Yes, will be pouring pad, and the stringers will anchor to pad with embedded hardware.

 

If it has to be inspected, 2' footings may be required depending on local codes.