Installing a roof truss on an attached garage can cost as much as $30 per square foot. Garages: Installing a roof truss on a detached garage costs $3,500 to $9,000, or $7 to $16 per square foot, depending on the size.This type of building uses post-frame construction, making roof truss installation easier. Pole barn houses: A pole barn house is built using poles secured to the ground to support the exterior walls and roof trusses.Framing the entire house costs $14,000 to $32,000, so a roof truss takes up a large chunk of this expense. New houses: Building a roof truss on a 2,000- square-foot home costs $7,200 to $12,000.The cost of adding a roof truss to different building types varies due to materials, labor, and support considerations. The scissor truss creates a vaulted ceiling. Scissor roof/vaulted truss: A scissor-shaped bottom chord splits into two sections and angles upward. A horizontal support beam connects the posts, allowing it to handle a wider span than a king post truss. Queen post truss: Two vertical posts that come up from the bottom tie beam to support the rafters in a queen post truss.Mono /half truss: A mono /half truss has a single-sloping top chord with a vertical edge on the opposite side.King post truss : A king post truss has a single post located vertically at the roof center with two webbing chords.Howe truss: Howe trusses include three vertical supports and two angled chords.Hip truss: Hip trusses create a flat roof section between slopes and have a flat top.Gambrel roof trusses are common on barns. Gambrel truss: Gambrel trusses have two pitches on one side of the roof.Gable truss : Gable trusses use vertical support webbing at the end truss.Flat truss: The top and bottom chords are parallel and commonly found on flat roofs.This creates a “W” shape and provides extra durability. Fink truss : Fink trusses consist of two support beams joined at the peak and angled down away from each other.Fan truss: This type has two fans starting at two points along the bottom chord. King posts, queen posts, finks, fans, and howe roof trusses all fall under this category.
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