What size beam can span 20 feet?

When you consider the wooden beam, it has to be at least 18 inches in depth for 20-foot spans.

What size beam do I need for a 16 ft span?

LVL beam size for a 16 foot span:- as per general thumb rule, for a 16 foot span, size of LVL beam or GLULAM should be 7-8 inches deep and 3 inches wide, thus you need something like a 7-8″ GLULAM or LVL to span upto 16 feet used for residential building or projects.

What size beam do I need to span 25 feet?

For 25 foot span, size of simply supported beam for 2-3 storey residential building, using thumb rule, is about 15″×18″ in which beam width is 12″ and beam depth is 15″, if width will be kept 12″, depth should increased, then beam size 12″×24″ can be used, providing with 4nos of 16mm bar at top, 4nos of 20mm bar at …

How much space do you need for a beam to span?

Answer Wiki. You need a beam 16 inches deep (1 Ft- 4 inches) X 12 Inches wide( 1 Ft- 0 inches). The rule of thumb is one inch for every foot of span for concrete beams. For Steel beams the rule of thumb is 1/2 inch for every foot of span. So there you have a guideline for beam spans.

What size beam do I need for a 12 inch beam?

You need a beam 16 inches deep (1 Ft- 4 inches) X 12 Inches wide( 1 Ft- 0 inches). The rule of thumb is one inch for every foot of span for concrete beams. For Steel beams the rule of thumb is 1/2 inch for every foot of span.

How much concrete do I need to cover the beam?

At least 50mm cover, if the concrete surface is to be exposed to the weather or in contact. To simplify construction and thereby to reduce costs, the overall dimensions of beams, b and h are almost rounded up to nearest 25 mm.

What are the limitations of a beam on a building?

On the other side the span of the beam has some limitations. Generally reinforced concrete becomes not economic with spans bigger than 10m. For bigger spans you use prestressed concrete and you can reach up to 150m span. Longer spans are generally done with composite steel concrete or only steel structures.