Flat Roof Post And Beam Construction

One of the most important parts of the wall and roof system is venting the roof.

Flat roof post and beam construction.

Remove the roofing materials and install 4 8 inches of rigid foam insulation board above the roof decking then new roof sheathing over that then new roofing materials. The tables below give maximum spans for rafters and beams. The figures are based on quality materials. For areas with attic space above flat ceiling ceiling joists are included but the remainder of the ceiling system above is by owner contractor.

Ensure the lower sides are against the post and the opening between the upper sides faces the direction the beams will be installed. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Stress skin panels are used to carry loads and also insulate roofs. The panels are called sip s structural insulated panels.

To the right is a picture of a typical wall roof system. 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. 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. Jun 3 2017 explore anthony valentine s board flat roof on pinterest.

The various framing patterns are shown in figures 18. And cdx fir plywood. They may or may not have an overhang. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Build a metal roof white or bare metal over the existing shingle roof using eave to ridge 2x4s to build ventilation channels under the new roofing. Post and beam home design. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. First roof area assembly the first roof area is constructed with heavy timbered components that are secured to the ridge beam and second floor beams.

They may be constructed out of posts and beams or out of closely spaced joists. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. There is a good deal of variety in the design of flat roofs. Fit a metal post cap beam connector on the top of the post.