Post And Beam Roof Rafters

Decide your beam height.

Post and beam roof rafters.

Roof slope is commonly represented as x in 12. 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. The main elements of the gable roof layout are the ridge beam common rafters and wall plate. 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. Post and beam home design. Above these components is a rack of common rafters. For areas with attic space above flat ceiling ceiling joists are included but the remainder of the ceiling system above is by owner contractor.

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. For example a roof slope that rises 6 inches for every 12 inches of run is said to. If our example roof has only one beam it must carry half of the total load or 4 000 pounds. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

Set the laser level on a raised level platform like a portable saw station and shoot and mark the red dot on each post keeping the laser level perfectly level as you turn your aim from post to post. In the same way you may need posts to support your roof beam. Post and beam framing is more simple and actually an older style with main carrying members bents or lintels supporting joists and rafters that are notched in to the beams. The first roof area is constructed with heavy timbered components that are secured to the ridge beam and second floor beams.

These roof types have the basic elements of all of the other roofs and make it a perfect place to begin the discussion. 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. There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams. Use a laser level to mark each post.

And cdx fir plywood. 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. Stonehenge is the perfect example of post and beam construction using stone instead of timber. A timber frame truss roof with ridge beam purlins and common rafters is a stunning combination that creates visual interest and structural complexity.