Depends on the loads and the properties of the beam. Consult a structural engineer.
That depends on what it carries. All joist/beam manufacturers have span tables that will help you determine this.
It depends on the type of beam, the material, whether it is a bridge span or cantilever, the allowable deflection and safety margin needed. We need a lot more data on the application.
Use a steel beam.. That would be code.. steel w10x15 (50ksi) I beam.
With a span of only 8" you can probably use a wood beam, but without a set of plans no one can accurately answer your question.
20 to 100 or more years, depending on harshness of environment b
A 2x10 board can span up to 16 feet without additional support.
A 2x10 rafter can typically span up to 16 feet without additional support.
A 2x10 wooden board can span up to 16 feet without any additional support.
A 2x6 board can span up to 9 feet without any additional support.
A double 2x10 beam can typically span up to 12 feet without additional support.
A 2x10 board can span up to 16 feet without support, depending on the type of wood and load it will bear.
A 2x10 board can span up to 16 feet without any additional support.
How far can 1 by 6 span without support
A 2x6 board can span up to 9 feet without support, depending on the type of wood and the load it needs to bear.
A 2x6 board can span up to 9 feet without support, depending on the type of wood and the load it needs to bear.
The maximum span for a 2x8 rafter without support is typically around 10-12 feet, depending on the specific load and building codes in your area.
W8 x 24