Scissor Truss Over Existing Roof

A mono truss roof allows for more sunlight and visual space proper drainage and relatively cheaper.

Scissor truss over existing roof.

It s often used for sheds garages or extension of an existing roof. The more complex the truss framework is the greater quantity of these joints will be required. These steel joints are needed to support the overall truss. The standard roof truss spacing is 2.

A cantilever truss allows for level coverage past the exterior wall such as patios porches entryways and other offsets in the building elevation by moving one or both bearings inward from the end of the bottom chord up to 1. The likely design option may involve removal of the existing trusses and replacing them with a scissors truss system which uses about 50 percent of the pitch of the existing roof. A mono truss is a one sloped truss that forms a right angle triangle. Rather than trying to make a scissor truss do a raised center.

The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. For a 2 000 square foot home roof truss installation typically costs between 7 200 and 12 000 you ll spend anywhere from 1 50 to 4 50 per square foot for materials alone or between 35 and 150 though extremely long and complex types can reach 400 each labor runs anywhere from 20 to 75 per hour ranges in both materials and labor are due to location size and roof complexity. These types of trusses are often used to create multilevel roof lines or construct additions to an existing building. Replacing a roof can be expensive but if a roof contains only a small slope it s possible to raise the roof pitch of a house by building a roof over the old one.

If you modify the existing trusses i have one suggestion. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. That way the last few feet at each end of the truss will not have to be modified and the changes should be less extensive. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof.

This is the distance between trusses. This new roof with a higher pitch can be accomplished with premade roof trusses and typical asphalt shingles. The engineer must compute the roof load such as snow accumulation roofing materials and other factors. The same thing is true for the bridge of the truss.

Jul 16 2020 explore kristin mullen s board scissor truss on pinterest.