What type of lumber is used for roof framing?
Kiln-dried Douglas fir wood presents the number one choice for building a rafter-styled roof in a wood frame house.
What size wood is used for roof framing?
You can use either 2×6 or 2×4 rafters for roofs with a 3/12 pitch or greater, but it depends on the overall size of your shed. For roofs that won’t experience heavy snow loads, a gable roof can span up to 22′ with 2×4 rafters.
Which timber is best for roofing?
Cedar has earned a reputation for being strong, flexible, and weather resistant – qualities that make for an effective roofing shingle. Among roofing shingle manufacturers, cedar is the go-to material, all thanks to its durability.
Do you need a ridge beam for rafters?
Is a Ridge Beam Necessary? A ridge beam is a must for peaked roofs with a slope less than 3/12, or where a continuous tie by a collar tie or ceiling joist isn’t possible, or if the ceiling joists don’t run parallel to the rafters. A beam is also necessary if the ceiling joists are above the bottom 1/3 of the rafters.
How far can you span a 2×6 for a roof?
How Far Can a 2×6 Rafter Span? A 2×6 rafter can span 14 feet 8 inches when spaced 16 inches apart with No. 1-grade southern pine lumber on a roof with a 3/12 slope or less with a maximum live load of 20 pounds per square foot and a dead load of 15 psf.
How far can a 2×4 span for a roof?
A 2×4 can span a maximum of 6′ 7” when spaced 16” apart and used as a floor or deck joist. When used as a ceiling joist or a roof rafter, a 2×4 can span up to 7′ 3” spaced at 16”, and 6′ 4” when spaced 24” apart. Due to the small spans of 2x4s, they often are not used in horizontal load-bearing capacities.
Can I use I joists for rafters?
Some builders use manufactured I-joists not only to support floors, ceilings, and flat roofs, but also in place of either sawn-lumber rafters or wood trusses to support pitched roofs.
What size timbers do I need for a roof?
Roof pitch between 30 and 45 degrees with rafter spacing strength class C16
| Size of rafters in mm | 400mm | 600mm |
|---|---|---|
| 100 x 47 | 1.91 | 1.78 |
| 125 x 47 | 2.52 | 2.33 |
| 150 x 47 | 3.14 | 2.88 |
What size are timber roof battens?
Timber battens compliant with BS 5534 typically come in two basic dimensions: 25x38mm and 25x50mm, with the ±3mm tolerance.