Large building developers are equipped for trusses they usually have plenty of space, lifting equipment, and large crews. Accounting for about three-quarters of the roof systems in new houses, they are the heavy favorite in housing developments, even high-end developments. Unlike beams, joists, or rafters, roof trusses are pre-fabricated. The primary difference between the two is the load they bear, as raftered roofs often feature large loft spaces where insulation is placed between the rafters. Residential builders, however, have voted with their wallets on this issue. Like joists, rafters are spaced evenly and laid parallel to one another, running from the ridge to the eaves. It’s not possible to say whether trussed roof systems are less expensive than raftered roof systems because there are so many variables in building design. Getting them hoisted, set, and braced is a logistic challenge, which often requires a large crew and a crane. Because trusses have to be ordered in advance, the builder needs to have good organizational and communication skills. This does not mean, however, that installing trusses is not challenging. The layout for trussed roofs is usually straightforward.
Trusses can be made for cathedral ceilings (“scissor trusses”), but the effect is less spectacular than those created by rafters.
This permits the rooms beneath to be large and open. TrussesĮngineers can design trusses that are capable of spanning very long spaces between bearing walls. In general, rafters are lighter and more flexible in use these attributes make them popular with remodeling contractors and custom builders. On some restricted sites, rafters are the only option-both because there’s no room to maneuver a crane and because there’s no place to store trusses. There’s no lead time and no need to set up a large crew or a crane. On small jobs, it’s often easier to use rafters.
JOIST VS RAFTER INSTALL
The individual pieces of the frame are fairly light, however, and one or two carpenters can usually move them around and install them withīudget, schedule, and job-site conditions The layout for raftered roofs is one of the most difficult layouts in frame carpentry. The size and openness of the rooms under raftered roofs are limited by the spans of the rafters, joists, and, sometimes, structural ridges.
JOIST VS RAFTER FULL
If you use a nonstructural ridge, you can make full use of the space between the joists and the rafters. In conjunction with a structural ridge, you can build rooms with cathedral ceilings. There are many factors to consider when choosing between rafters and trusses for the roof frame: the effect that the designer wants to achieve the size and skill of the crew that will frame the roof the budget and schedule of the job and the amount of space available around the building.
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