Not sure why you need a beam that bears no load. You can go 22'. Beyond that it needs to be broken down to shorter lengths.
Even using a 2x12 the spacing for 20 feet will be less than 12 inches on center. I would recommend splitting the distance with a double beam perpendicular to the joist run. This will allow you to go up to 24 inches on center. Your span will only be ten feet aproximately this way. I would double the beam. (2-2x12 joined together) Good luck. when building your beam make sure the laps on the beam are at least 6 foot apart and put a good wood glue on the 2x12s plus for added strength put 1/2 inch O.S.B. in between the 2x12 and I would also lag or bolt them together, at about 16 to 24 inches O.S.B. = Oscilating Strand Board.
Depends on the area above the ceiling joists. Is it a live load (living space) or dead load (just the joists with maybe an attic above)? Also, the length of the ceiling joists from the last bearing point is a factor. How much weight is bearing on the beam is the critical issue.
Depends on how much weight is above it!! but on 1 -2 story wood framed structures triple 2x12's glued and nailed will do the trick
14ft to girder
The 2x12 span chart provides information on the maximum allowable span for a 2x12 lumber based on the load it will support.
The maximum allowable span for a 2x12 floor joist is typically around 18 feet, but this can vary depending on factors such as the wood species and the load it needs to support. It's important to consult local building codes or a structural engineer for specific guidance.
About 5metres(16') but would have to be stress graded timber.
Not sure why you need a beam that bears no load. You can go 22'. Beyond that it needs to be broken down to shorter lengths.
Triple? That sounds an awful lot like gluelam... Which requires engineer approval to meet code. The inspecting engineer will be able to tell you.
A 2x12 header can be suitable for a 12-foot span, depending on the load it needs to support and the type of wood used. Typically, a 2x12 made from a strong species of wood, such as Douglas fir or Southern pine, can handle this span for standard residential loads. However, it's essential to consult local building codes and possibly a structural engineer to ensure it meets safety and structural requirements for your specific application.
1 ft by 1.2 ft... verticaly 1.2ft
The maximum span for a 2x6 board is typically around 10 feet when used as a joist or rafter in construction.
The maximum weight capacity for a 2x6 span is typically around 50 pounds per square foot, but it can vary depending on the type of wood and the length of the span.
The maximum span allowed for 2x6 ceiling joists according to the 2x6 ceiling joist span table is typically around 12 feet.
Sergei Rachmaninov is thought to have a hand span of almost 0.28 metres.
The maximum span for 2x6 rafters in residential roof construction is typically around 9 feet.