How Do Attic Trusses Work

While almost all trusses are made in a factory and trucked in site built trusses also are a possibility.

How do attic trusses work.

A framing square will create the series of parallel lines and perpendicular lines if you simply slide it along one of the edges of the rafter. Once the trusses are up the roof is covered in plywood or osb which gives the roof tremendous rigidity. The trusses are tied to the walls with small metal plates. A roof truss takes the weight of the roof and the snow on the roof if you live in that kind of climate and transfers it out into the load bearing walls of your house.

The role of the horizontal beam is to tie the truss together and carry the load that would otherwise be sustained by the support and vertical timber also known as the king post. The longer the truss and the steeper the roof pitch the larger the room. Attic conversions are now possible by replacing the truss rafters with a shaped trusses or horizontal beams which in return create additional space. The narrow one that is 16 inches long is the tongue.

The trusses are fist stacked on top of the walls either by hand or with a crane. Note that a framing square has two legs. They are on 24 inch centers. Select build wall straight exterior wallfrom the menu then click and drag to draw a rectangular structure.

Do you need a crane to set attic trusses. Yes you ll need a crane because a typical attic truss weighs well over 100 pounds. The roof rises 4 inches in height for every 12 inches it runs horizontally. The rooms in the attic trusses depend on the length of the truss and the pitch or steepness of the roof.

These trusses went up in about four hours. Pitch this is the incline of the roof expressed as a fraction. While pitch and slope are used interchangeably they are not the same span also known as gable width this is based on the total footprint of the house and refers to the distance between two exterior. This structure will basically hold up the roof of the home or building and help the roof resist lateral stresses from wind snow loads and debris.

Trusses like all structures are devices for transferring loads from where you don t want them to where you do. Select file new planfrom the menu to open a new blank plan. An attic truss is a support feature found in many home or building attics. All trusses in a roof structure are designed for the worst possible combination of dead live and wind loads.

It s safer to use a crane for all involved.