What are the two main types of roof support systems?
Most Common Types of Roof Trusses
- Gable Trusses. A variety of the trusses shown above fit into the common or gable truss category, including the King Post, Queen Post, Howe, and Double Howe trusses.
- Hip Truss.
- Scissor Roof Truss.
- Attic Truss.
- Mono Truss.
- North Light Roof Truss.
- Flat Truss.
- Gambrel Truss.
What is a roof support called?
A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. Trusses usually occur at regular intervals, linked by longitudinal timbers such as purlins. The space between each truss is known as a bay.
How do I add extra support to my roof?
Extra support for the trusses can be made by placing a 2-by-4-inch piece of lumber from each truss on one side to the truss on the other side, high enough to provide head room but low enough to provide support for the trusses. In this situation, the walls of a finished attic space or room would go with the roof line.
How far apart are roof supports?
Roof trusses should be 24” apart, on center. Trusses are allowed to be closer together, at either 12” or 16” on center, but building codes allow for 24” on center spacing without using heavier duty fasteners for truss to wall connections.
What are the 3 types of trusses?
Common types of roof truss
- King Post truss. A king post truss is typically used for short spans.
- Queen Post truss. A queen post truss is typically a vertical upright with two triangles either side.
- Fink truss.
- Double Pitch Profile truss.
- Mono Pitch Truss.
- Scissor Truss (also known as Vaulted Truss)
- Raised Tie Truss.
Which is one of the most efficient type of timber roof trusses?
Raised Heel Roof Truss This is one of the most efficient types of timber roof trusses, mostly because it brings a very good room for insulation, but at the same time it also provides you with a very good system for structural support.
What supports the roof of a house?
Trusses are pre-fabricated, triangulated wooden structures used to support the roof. The alternative is to build up the roof’s frame with 2x8s and 2x10s. Trusses are quite common these days because they have five big advantages from the builder’s standpoint: Trusses are incredibly strong.
How can I make my roof stronger?
Reinforce the Trusses
- Apply construction adhesive.
- Stiffen Trusses.
- Brace gable ends.
- Clean out gutters.
- Repair and caulk flashing.
- Check for loose or damaged shingles.
- Lift shingles or underlayment.
- Remove TV or satellite antennas.
How far can a 2×4 Rafter span without support?
For heavy loads, 2x4s can span up to 5 ½’. Most roof framing is 24” on center, and you can still build sheds up to 14′ with 2×4 rafters at 24” on center.
How far can a 2×6 Rafter span without support?
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 truss span without support?
The greater the potential for a heavy snow load, the stronger your truss will need to be. For instance, if you live up north with a snow load of 55 pounds per square foot, then a 4/12 common truss using all 2×4 lumber can span up to 41′.
What is the best roof truss design?
Design Factors Raised chord is the most common type, providing excellent structural support and greater energy efficiency. Parallel chords are used on flat or low-slope roofs. Scissors create vaulted interior ceilings and are designed to bear additional weight of heavy snows.
Which style of roof truss is the strongest?
There is no “strongest” truss, but rather, one that is most appropriate for a specific application. There are four basic types of truss design: dropped chord, raised chord, parallel chord and scissors.
What is the best roof for high winds?
For overall durability, metal roofing is probably the best roofing material to consistently sustain high winds for the duration of the life of the roof. Metal roofing has less seams and overlaps than other roof options.
Can a 2×4 span 5 feet?
With a 20 pound dead load, max span for a 2×4 is 5 feet. Assuming that the load is square and there is no wind, the average 8 feet 2×4 could handle around 1,000 pounds vertically. Of course, it’s wise not to push the material up to its limit, use brace and alike to secure the 2x4s whenever it’s needed.
Can you span 12 feet with a 2×6?
The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12′-6”, ceiling joist 20′-8”, rafter 18′-0”, deck board 24”, deck joist 9′-11”, deck beam 8′-3”, and 6′-1” as for header. Always check the codes for determining factors or consult a Structural Engineer.
Should I use 2×8 or 2×6 rafters?
Simply so, should I use 2×8 or 2×6 rafters? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. 2×6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards.
How far can a 2×6 roof truss span without support?
How far can a 2×6 Rafter span without support? The table states that 2 X 6 rafters spaced 16 inches on center (o.c) can span a maximum distance of 13 feet 5 inches.