Rafter Supported Cone Roof

The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter.

Rafter supported cone roof.

Then the other two king commons support the ridge from the sides. Rafters rafters make up the main framework of all roofs. They are 90 degrees to the ridge and to the other king common. Purlins as shown in sample photos below are installed for rafter support.

The first common rafter attaches to the end of the ridge. They are inclined members spaced from 16 to 48 inches apart. The purlins are supported by vertical or slightly angled bracing. By upper third here we mean one third of the length of the rafter from ridge to top plate.

A collar tie is a horizontal roof rafter compression connector that is located in the uppermost third of the span of a pair of opposed sloped or gable roof rafters. In finding this location we do not count the additional length of the rafter that supports the roof eaves overhang or soffit. Roof is designed as a supported cone roof. Fabricate install new supported cone roof the screening estimates are based upon the following assumptions.

I plan to have 2 10 joists so there will be a second floor. I plan to support the ridge beam with support beam in the middle and the ends. The braces struts or kickers should be within every 4 and should not be at a greater than a 45 degree angle towards the roof slope lower side. Roof plate shall be designed as continuous beam with uniform load comprising of roof live load and self weight of roof plate.

Like framing a hip roof framing a cone or in this case a half cone begins with three common rafters. They vary in size depending on length and spacing. Supported at tank shell and load is transferred to tank periphery. Hi all i am new to this rafter lingo and techniques but am building a shed that is 16 x16.

Tank is clean gas and lead free and ready for hot work. The system of rafters is provided to support the roof plate. Rafters rest on the top wall plate. No hours are included for a dedicated fire safety watch.

Good access exists to tank for equipment and materials. From the second floor i have added another 2 framing around on which the roof rafters will sit. The tops of inclined rafters are fastened to the ridge or another rafter depending on the type of roof.