The answer to this question is too complex to describe here. There are too many factors which are not specified in the question, such as load in pounds per linear foot, spacing of the 4X12 joists, as well as grade and species of lumber.
350x450mm with 12-16mm rebars on 5m span
cost of steel 12''x18' i-beam per linear foot?
For ceiling joists, the minimum dimension per the IBC is a 2 x 12 inch, with spacing dependent on the load. Ideally, these would be screwed to blocking between the joists.
The maximum span of a 2x12 lumber depends on several factors, including the wood species, load conditions, and whether it is used as a floor joist or beam. Generally, for standard residential applications with a uniform load, a 2x12 can span approximately 12 to 16 feet. However, it's crucial to consult local building codes and a structural engineer for specific requirements and safety considerations.
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.
The recommended patio roof beam span according to the patio roof beam span table is typically around 10-12 feet.
The recommended pergola beam span according to the pergola beam span chart is typically around 12-16 feet, depending on the specific design and materials used.
The maximum span for a 6x8 beam depends on various factors, including the material (e.g., wood, steel), load conditions, and support type. Generally, for a standard wood beam, a 6x8 beam can typically span around 10 to 12 feet for residential applications with a uniform load. However, it is essential to consult local building codes and a structural engineer for specific guidelines and calculations relevant to your project.
Only if it is at least 12' long.
A double 2x10 beam can typically span up to 12 feet without additional support.
It depends on what the beam is made of.
Depends on the loads and the properties of the beam. Consult a structural engineer.
The maximum span for a double 2x12 beam made of pine can vary depending on factors such as load requirements, local building codes, and spacing of supports. Generally, for residential applications, a double 2x12 can span approximately 12 to 16 feet when used as a beam. However, it's crucial to consult local building codes and a structural engineer for specific requirements and load calculations.
What size steel I beam do I need to span a 32 feet garage with a floored storage above and no posts
The recommended pergola beam span for optimal structural support and durability is typically between 12 to 16 feet, depending on the material and design of the pergola. It is important to consult with a structural engineer or contractor to determine the specific beam span needed for your project.
350x450mm with 12-16mm rebars on 5m span
The maximum allowable span for a double 2x10 beam in a structural application is typically around 12-15 feet, depending on the specific load and building codes.