Shed Roof Design Loads

The dead load on a roof is the weight of the roof structure itself along with any permanently attached materials or structures on the roof so it must be designed first of all to support itself.

Shed roof design loads.

Shed roof a shed roof slopes in one direction only. It might seem logical to build the walls then add the roof trusses and the roof decking and only finally to add the trim and soffit boards. Per code section 6 1 4 1 the minimum wind load to be used in the design of the main wind force resisting system shall not be less than 10 psf. Consider different roof designs when building a shed but understand that pitch is pitch whether you have a 3 12 gable roof or lean to roof the physics of moisture penetration won t change even though the style is different.

Width a is equal to 10 of least horizontal dimension or 0 4 h whichever is smaller but not less than either 4 of least horizontal dimension or 3. The double pitch of the roof can add many square feet of perfectly usable space to your garden shed and make it possible for you to stand up close to the walls. Once you are aware of them it will make the construction of your shed roof easier and of better quality in the long and short term. The first mistake relates to the sequence above.

Live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids. If your rafter length is less than 5 feet use a 2 4 at 16 inch centers. D dead load l live load l. For a larger map with greater detail refer to asce 7 98.

A gable roof has the same pitch on each side as well as the same length. Loads used in design load equations are given letters by type. 3 20 residential structural design guide. For most sheds less than 20 feet wide with a 3 12 gable roof 2 6 at 16 inch centers works and that s with a 40 pound live load.

Farmers developed this barn style roof as a way to maximize the usable space in their barns. Chapter 3 design loads for residential buildings. Easy rafters is designed to calculate shed roofs that are framed to a ledger board nailed against a vertical wall not freestanding shed roofs supported by walls at both ends.