What is the maximum span for attic trusses?
A roof truss can span up to 80′ without support, however in any home that distance would be impractical and incredibly costly. Trusses are designed to span spaces without interior supports, and spans of up to 40′ are the most common in today’s homes.
What is the pitch of an attic truss?
The pitch, or slope, is the incline of the roof expressed as a fraction describing the rise over the run. The run or the base number is 12 inches. The rise will be the elevation change over the 12 inches.
Can you have attic space with trusses?
It’s easy. A truss designer uses software that creates two giant girder trusses that allow for a full-sized staircase up into the new attic space. All you have to do is draw the staircase on the floor plan where you want it to go up into the attic and the truss manufacturer will make the magic happen for you.
How far can a truss overhang?
Overhang is the portion of the truss that extends beyond the outside bearing of the structure, creating an eave for the building. Overhang length can vary from as small as 6” to as great as 36” in certain applications.
How far can a 2×6 Rafter span without support?
2-grade 2×6 joists can span up to 10 feet 9 inches from beam to beam when spaced the standard 16 inches apart with a maximum live load of 30 inches per square foot.
How wide can an attic truss be?
These attic trusses generally had a 2×8 or 2×10 bottom chord with a 2×6 or 2×8 top chord. This meant that the size of the room created within the attic truss was restricted by the span value of the bottom chord. “Typically, you were looking at a maximum room span of around 16 feet,” he said.
How do you put support on a roof truss?
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 do you anchor roof trusses?
Stand the first truss on the end of the wall, flush with the outside end of the wall. Center the truss side to side so that the ends overhang evenly on each side. Nail through the bottom horizontal board of the truss on an angle into the top plate on each wall to hold it in place.
How do you reinforce attic trusses?
Reinforce the Trusses
- Apply construction adhesive along the edge of the truss to strengthen the connection to the plywood roof deck.
- Stiffen trusses by joining them with 2x4s running from one end of the house to the other.
- Brace gable ends with diagonal 2x4s.
- Connect trusses to walls with hurricane tiedowns.