big one
That really cannot be answered without looking at the entire set of plans.
That depends on what it carries. All joist/beam manufacturers have span tables that will help you determine this.
I would involve an engineer on that one. You might end up with an I-beam and pipe support columns, which also need proper support.
Drilling through structural beams is strictly limited. You must have engineers approval.
Micro Lam sizing is based on load carried. You need to provide additional information to calculate accurate size. 1. What type of structure are you supporting? 2. Are you replacing an existing support wall or other structural member? 3. Where are you located? (Roof loads and other information is based somewhat on your location.) Good Luck!
Kyla Lam
Wilfredo Lam has written: 'Wifredo Lam, 1902-1982'
Chung Dha Lam goes by Jona Lam.
Dion Lam goes by Lam Tat Ho Dion.
Teresa Lam's birth name is Ka-Yee Lam.
Chet Lam's birth name is Yat-fung Lam.