Rafter Supported Cone Roof

Purlins as shown in sample photos below are installed for rafter support.

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. Hi all i am new to this rafter lingo and techniques but am building a shed that is 16 x16. Good access exists to tank for equipment and materials. By upper third here we mean one third of the length of the rafter from ridge to top plate.

I plan to have 2 10 joists so there will be a second floor. Roof plate shall be designed as continuous beam with uniform load comprising of roof live load and self weight of roof plate. Rafters rafters make up the main framework of all roofs. The tops of inclined rafters are fastened to the ridge or another rafter depending on the type of roof.

Doorsheet is a minimum of 8 high x 8 6 wide. The first common rafter attaches to the end of the ridge. No hours are included for a dedicated fire safety watch. They are inclined members spaced from 16 to 48 inches apart.

Then the other two king commons support the ridge from the sides. Rafters are nailed to the plate. The purlins are supported by vertical or slightly angled bracing. 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.

They vary in size depending on length and spacing. From the second floor i have added another 2 framing around on which the roof rafters will sit. So this table could accommodate a house with a total rafter span or house width of 32 feet. Like framing a hip roof framing a cone or in this case a half cone begins with three common rafters.

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. Rafters rest on the top wall plate. Roof is designed as a supported cone roof. Tank is clean gas and lead free and ready for hot work.

They are 90 degrees to the ridge and to the other king common. Fabricate install new supported cone roof the screening estimates are based upon the following assumptions. In finding this location we do not count the additional length of the rafter that supports the roof eaves overhang or soffit.