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I apologize for the delay. I didn't receive notice that you had responded.
Do you want to clear span the 26' or can you have a post in the middle?
This is for a cathedral ceiling? correct? What is the city and state?
I'm sorry. It's for the attic only.
Without the post, you need a 7" x 20" 2.0E LVL
With a post at midspan, you will need a 5.25" x 11.25" 2.0E LVL