Replies

1. 
   calvin | Nov 21, 2023 06:58pm | #1

   The reasoning for the blocking at beams is that it is a point load and the possibility for the load to twist or collapse the joist.

   Is this mid span or cantilever?

   If permitted, a strict interpretation might not pass it. With all the deck/balcony failures the code enforcement has become more strict.

   A common sense inspector would likely allow it. I can’t see it from here so take this for what it’s worth. Was blocking an afterthought? Surely there’d be no problem up top the framing.

   You have a sketch or photo?

1. 
   jnjug | Nov 22, 2023 10:32am | #2

   Thanks for your input. This is an existing deck that was permitted about 20 yrs ago. Found some issues like joist hangers not fully supporting joists, poor flashing details. We are replacing the decking and railing. Doing this a free labor job for my niece.
   I attached a sketch with some of the blocking in question shown. I don't know why it was done this way. We have no qualms about replacing the blocking if we have to. I assume that the blocking has to be full depth (2x10).
   Again appreciate any thoughts.

   
1. 
   calvin | Nov 23, 2023 09:47am | #3

   Dbl beam so stagger the blocking above it. Still on the beams.

   Check with your inspector, you may have to block between the longer open spans. Not that I’ve ever seen joists roll over on a deck.

   Weird loads on a deck when heavy objects or concentrated groups of people or even the hot tub I’ve always wanted (not).

2. 
   90DegreeAngles | Nov 24, 2023 05:58am | #4

   It's best to have deck joist blocking right over the beam for added support and stability. If you move it 1-1/2" off the beam, it might weaken the structure, especially if you're planning to put a heavy load on the deck.