I am going to build a new deck with pressure-treated lumber. First, there will be three support beams on which I will then lay my floor joists. The end grain of the floor joists will be covered with a frame mitered together with the first and last floor joists.

Down to the ground, it will be enclosed with decking boards. However, I have not resolved the issue on the sides where the end grain of the support beam will be visible. Are there any good tricks to address this without weakening the floor joist that sits on the outermost side of each side?
 
I have the same construction as you regarding the floor joists. I screwed together two pieces of 45x95, one about 150mm shorter than the other (I have 170mm floor joists). I placed these on the inside of the outer floor joists, as well as in the front "frame". I made them as long as I wanted the skirt (or actually a bit shorter). The outer edge of these is flush with the end grain beams and the outer edge of the floor joists that form the frame. Then I screwed decking boards as a skirt into these, as well as into the end grain of the beams.

I hope it's clear how I did it :)

Edit: pictures attached

Wooden floor joist construction in progress at the base of a red wooden building with a blue door; showcasing a detailed frame setup.
Wooden deck construction with white vertical posts and brown facade of a building in the background. The deck frame includes joists and beams.
Wooden deck with white railing posts and a skirt made of deck boards. The deck is attached to a red wooden house with a white door.
 
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Best answer

The easiest way is to place an additional floor beam outside of the last one and outside the short end of the support beam, then miter this against the beam that will hide the front edge. Then, continue with decking wood in the same manner as on the front side. If you have 45x145 as floor beams, you have the option to use a 34x145 for this. I'd be happy to draw a picture if there's interest.
 
J justusandersson said:
The simplest way is probably to place an additional floor beam outside the last one and outside the short end of the beam, and then miter this against the beam that will conceal the front edge. Then you continue with decking boards in the same way as on the front. If you have 45x145 as floor beams, you have the option to use a 34x145 for this. I would be happy to draw a picture if there's interest.
I understand what you mean. I'll go with 145 decking and the floor joists are also 145, so I'll probably go with this. Thanks.
 
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