Scissor Truss Over Existing Roof

Storage trusses work well over garages.

Scissor truss over existing roof.

An engineering design is my next step. The more complex the truss framework is the greater quantity of these joints will be required. A scissor truss is a truss that has sloped bottom chords that create a sloping inverted v shape inside the room under the truss. Scissors provides a cathedral or vaulted ceiling.

Once the trusses soffit and fascia are in place lay the roofing felt in place. Nail the shingles to the felt starting from the outside in and cutting to fit when you reach a corner or edge. You not only get the speed of framing that you get with common trusses but also the added benefits of an interior sloped ceiling. Disposal run in the range of 300 to 1 800 though it can be as low as 100.

There are a few reasons why builders go with stick framing versus roof trusses. These steel joints are needed to support the overall truss. Attic trusses create free bonus rooms. Nail the trusses into the existing room fasteners.

Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the. Now you can begin shingling your roof preferably with asphalt shingles. The offset scissor truss has a bottom chord that is flat for a distance and then is vaulted up and back down. Demolishing existing trusses costs 4 to 5 per square foot.

Mono and vaulted mono trusses are only sloped in one direction. A scissors truss is a really cool roof framing option. Most economical when the difference in slope between the top and bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch. Free standing structure then we need to know so we can match the existing roof.

The partial scissor truss is similar except that the bottom chord slopes up in one direction and then straight down while the remaining portion is flat. In order for us to match the current roof we need to know the following. What is the normal interior slope of the scissor truss. The same thing is true for the bridge of the truss.

7 scissor trusses. The truss span the heel. 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. Scissors truss installation in an existing roof.

Just wanted to know if it was possible or if the engineers tend to balk at truss mods. The engineer must compute the roof load such as snow accumulation roofing materials and other factors. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.