I am currently building my first deck and ran into a height issue with how tall I poured my footers. I needed to lose about 2.5″ in height between the frame and the decking, and I discovered that you can notch your joists and beams if following strict guidelines.
Now just a few facts on the build:
-I am currently located in Colorado and my city uses the 2015 IRC
-The deck is a 16’x20′ attached to a ledger on the house
-My footers are 12″, attached to which are 6″x6″ posts, which I have notched to attach my beams which are 2-2″x10″
-I am using pressure treated southern pine, with a beam span of about 6’10” and a joist span of about 8’2″
What I want to do is notch my beam where it crosses my post with a 1.5″ notch. This will need to be an actual width of 5.25″ and this is where the code loses me. I see in IRC 502.8.1 that you can notch the edge of a board to 1/4 its width (which I should be in the clear on) but I don’t see how wide this notch can be. The illustrations provided show a single beam span, but I am using 2 lengths of beam to make up the 20′ run.
I am fairly certain I will be good on my joist notching as this seems to be fairly common and the notch wont be more then 3″ wide.
Any ideas on whether this beam notching will be permissible?