**What size wood beam for 20′, 16′, 18′, 12′, 22′, 24′, 25′, 26′ & 30 feet span** | wood beam size for 10 foot span | wood beam size for 16 foot span | wood beam size for 20 foot span | wood beam size for 30 foot span | wood beam size for 24 foot span.

Beam is generally made of wood or timber, steel and rcc concrete providing with reinforcement Steel. It is load bearing structure and flexural member of frame structure that supporting the floor joist that vertical transfer all the incoming dead load, live load and self load of roof to the post or column via post- beam joint through development length of structure element to the foundation and finally to the soil.

**Size of beam** generally depending on span between two support and all the load acting on it. Beam is structural member subjected to flexural stresses and shear forces . The size of the beam (width and depth of beam) are governed by the different type of shear forces and stresses. When the beam is subjected to loading the bending moment is developed and the moment carrying capacity of the beam depends mainly on the depth of the beam.

In this article we mainly know about wood beam size (depth and width). Many species of wood Douglas fir, southern yellow fine, spruce pine fir, others hardwood of different grade of lumber #1, #2 or #3 are used for beam. Beam size are mainly of 2 ply such as 4×8 or 2-2×8, 2-2×10, 2-2×12, 3 ply 6×8 or 2-3×8, 4 ply 8×10 or 4-2×10 and 5 ply 10×12 or (5-2×12) are used.

A wood beam is a structural support made from different species and grade of wood wood. They are most commonly used in wood frame structures like small houses, although they can be used in other types of construction as well. Beams are designed to resist bending when stressed by weight or forces like high winds

They are included in structural elements like floors and roofs to distribute the weight of the structure and provide support. Historically, wood was the most common construction material in many regions of the world in US, UK, Canada and solid wood beams were a preferred method of structural support.

The type of wood and size of the beam both play a role in how much weight a single wood beam will be able to bear.

Highly dense, close-grained woods of different species tend to be preferred because of their increased strength, as well as resistance to insects and rot. The wood beam can be cut in a solid block, I, or H shape, depending on the needs of construction.

In some cases, multiple pieces of wood are stacked and bound to create a single beam. If 2 beam nailed together known as 2 ply beam such as 2-2×10 or 4×10, if 3 beam nailed together known as 3 ply beam such as 3-2×10 or 6×10, if 4 beam nailed together known as 4 ply beam such as 4-2×10 or 8×10 and if 5 beam nailed together known as 5 ply beam such as 5-2×12 or 10×12.

In this article you know about what size wood beam for 20′, 15′, 16′, 18′, 12′, 22′, 24′, 25′, 26′ & 30 feet span and also know wood beam span rule of thumb that help you in better deciding and sizing of wood beam.

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**What size wood beam for 20′, 15′, 16′, 18′, 12′, 22′, 24′, 25′, 26′ & 30 feet span**

A rough sawn wood beam is one whole piece of lumber cut to size. For deciding wood beam size a common rule of thumb used for estimating the depth needed for a wood beam is the span/15. The width of the beam is commonly 1/3 to 1/2 of the beam depth. Deflection under full load should never exceed 1/360 of the total beam’s span.

**Wood beam size for 20 feet span**:- as per general thumb rule and guidelines, for a 20 foot span, you will need atleast 4-2×16 or 8×16 size of wood beam. Thus, a 4 nailed 2×16 or 4-2×16 or 8×16 wood beam can allow to span 20 feet. For a 20-foot spans, the wood beam has to be at least 16 inches in depth and 8″ in width (4-2×16) used for residential building or projects.

**Wood beam size for 10 feet span**:- as per general thumb rule and guidelines, for a 10 foot span, you will need atleast 3-2×8 or 6×8 size of wood beam. Thus, a 3 nailed 2×8 or 3-2×8 or 6×8 wood beam can allow to span 10 feet. For a 10-foot spans, the wood beam has to be at least 8 inches in depth and 6″ in width (3-2×8) used for residential building or projects.

**Wood beam size for 12 feet span**:- as per general thumb rule and guidelines, for a 12 foot span, you will need atleast 3-2×10 or 6×10 size of wood beam. Thus, a 3 nailed 2×10 or 3-2×10 or 6×10 wood beam can allow to span 12 feet. For a 12-foot spans, the wood beam has to be at least 10 inches in depth and 6″ in width (3-2×10) used for residential building, wood frame structure or projects.

**Wood beam size for 14 feet span**:- as per general thumb rule and guidelines, for a 14 foot span, you will need atleast 3-2×12 or 6×12 size of wood beam. Thus, a 3 nailed 2×12 or 3-2×12 or 6×12 wood beam can allow to span 14 feet. For a 14-foot spans, the wood beam has to be at least 12 inches in depth and 6″ in width (3-2×12) used for residential building, wood frame structure or projects.

**Wood beam size for 15 feet span**:- as per general thumb rule and guidelines, for a 15 foot span, you will need atleast 3-2×12 or 6×12 size of wood beam. Thus, a 3 nailed 2×12 or 3-2×12 or 6×12 wood beam can allow to span 15 feet. For a 15-foot spans, the wood beam has to be at least 12 inches in depth and 6″ in width (3-2×12) used for residential building, wood frame structure or projects.

**Wood beam size for 16 feet span**:- as per general thumb rule and guidelines, for a 16 foot span, you will need atleast 3-2×14 or 6×14 size of wood beam. Thus, a 3 nailed 2×14 or 3-2×14 or 6×14 wood beam can allow to span 16 feet. For a 16-foot spans, the wood beam has to be at least 14 inches in depth and 6″ in width (3-2×14) used for residential building, wood frame structure or projects.

**Wood beam size for 18 feet span**:- as per general thumb rule and guidelines, for a 18 foot span, you will need atleast 3-2×16 or 6×16 size of wood beam. Thus, a 3 nailed 2×16 or 3-2×16 or 6×16 wood beam can allow to span 18 feet. For a 18-foot spans, the wood beam has to be at least 16 inches in depth and 6″ in width (3-2×16) used for residential building, wood frame structure or projects.

**Wood beam size for 22 feet span**:- as per general thumb rule and guidelines, for a 22 foot span, you will need atleast 3-2×18 or 6×18 size of wood beam. Thus, a 3 nailed 2×18 or 3-2×18 or 6×18 wood beam can allow to span 22 feet. For a 22-foot spans, the wood beam has to be at least 18 inches in depth and 6″ in width (3-2×18) used for residential building, wood frame structure or projects.

**Wood beam size for 24 feet span**:- as per general thumb rule and guidelines, for a 24 foot span, you will need atleast 4-2×18 or 8×18 size of wood beam. Thus, a 4 nailed 2×18 or 4-2×18 or 8×18 wood beam can allow to span 24 feet. For a 24-foot spans, the wood beam has to be at least 18 inches in depth and 8″ in width (4-2×18) used for residential building, wood frame structure or projects.

**Wood beam size for 25 feet span**:- as per general thumb rule and guidelines, for a 25 foot span, you will need atleast 4-2×18 or 8×18 size of wood beam. Thus, a 4 nailed 2×18 or 4-2×18 or 8×18 wood beam can allow to span 25 feet. For a 25-foot spans, the wood beam has to be at least 18 inches in depth and 8″ in width (4-2×18) used for residential building, wood frame structure or projects.

**Wood beam size for 26 feet span:-** as per general thumb rule and guidelines, for a 26 foot span, you will need atleast 4-2×18 or 8×18 size of wood beam. Thus, a 4 nailed 2×18 or 4-2×18 or 8×18 wood beam can allow to span 26 feet. For a 26-foot spans, the wood beam has to be at least 18 inches in depth and 8″ in width (4-2×18) used for residential building, wood frame structure or projects.

**Wood beam size for 28 feet span:**– as per general thumb rule and guidelines, for a 28 foot span, you will need atleast 5-2×18 or 10×18 size of wood beam. Thus, a 5 nailed 2×18 or 5-2×18 or 10×18 wood beam can allow to span 28 feet. For a 28-foot spans, the wood beam has to be at least 18 inches in depth and 10″ in width (5-2×18) used for residential building, wood frame structure or projects.

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**Wood beam size for 30 feet span**:- as per general thumb rule and guidelines, for a 30 foot span, you will need atleast 5-2×18 or 10×18 size of wood beam. Thus, a 5 nailed 2×18 or 5-2×18 or 10×18 wood beam can allow to span 30 feet. For a 30-foot spans, the wood beam has to be at least 18 inches in depth and 10″ in width (5-2×18) used for residential building, wood frame structure or projects.

**Conclusion**:-

For a 20 foot span, you will need atleast 4-2×16 or 8×16 size of wood beam. Thus, a 4 nailed 2×16 or 4-2×16 or 8×16 wood beam can allow to span 20 feet. For a 20-foot spans, the wood beam has to be at least 16 inches in depth and 8″ in width (4-2×16) used for residential building or projects.