Post And Beam Roof Rafters

Exposed ridge beam collar ties or purlins for cathedral areas as required and 6x8 douglas fir plate beams typically 2x12 spruce rafters 2 o c.

Post and beam roof rafters.

If your span table shows the roof beam cannot support the roof rafters for the whole length of your house you will want to choose a built up roof beam whose maximum spans are the same as or slightly longer than your chosen floor beam spans. Roof slope is commonly represented as x in 12. Above these components is a rack of common rafters. The first roof area is constructed with heavy timbered components that are secured to the ridge beam and second floor beams.

These timbers are then tied together with collar ties the horizontal members and gusset plates the metal fasteners as you can see in the photo below right. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. These roof types have the basic elements of all of the other roofs and make it a perfect place to begin the discussion. Decide your beam height.

A timber frame truss roof with ridge beam purlins and common rafters is a stunning combination that creates visual interest and structural complexity. Use a laser level to mark each post. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry. If there is also a beam in the middle of the roof divide the total load by three.

The main elements of the gable roof layout are the ridge beam common rafters and wall plate. And cdx fir plywood. If our example roof has only one beam it must carry half of the total load or 4 000 pounds. If one side of the roof is supported by the house and the other side is supported by the beam divide the total load by two as the beam is only supporting half of the roof.

For areas with attic space above flat ceiling ceiling joists are included but the remainder of the ceiling system above is by owner contractor. There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams. Stonehenge is the perfect example of post and beam construction using stone instead of timber. In the same way you may need posts to support your roof beam.

Post and beam home design. For example a roof slope that rises 6 inches for every 12 inches of run is said to. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. First roof area assembly.