Construction Cost Estimating


Brief overview of Roof Truss

Your building should have been finished properly for a beautiful appearance. The roof design and roofing materials play a vital role in this regard.

Roof slope stands for the slant of the roof.
It is demonstrated on a drawing as a slope ratio diagram or fractional pitch.
The slope diagram provides the ratio among the rise and run of the roof.
The run is stated as 12 units all the times.
Fractional pitch refers to rise/clear span.

Roof Trusses: The roof truss is a collection of members to build an inflexible framework.
To purchase a truss, required information ranges from span, roof pitch, spacing of trusses, and roof load.
Usually, lightweight wood trusses contain span distances of 20 ft to 32 ft
Residential trusses are generally 2” x 4” or 2” x 6” lumber.

The cornice, a portion of the roof, overlaps with the side walls.
There are three types of cornices which are mostly recognized in residential construction.

Open cornice.
Box cornice.
Close cornice.

Roof Sheathing and Roofing: Roofing material is supported by Roof sheathing.
Sheathing usually refers to plywood or other sanctioned panel products.
Sheathing thickness is based on spacing of the rafters.
½” sheathing-grade plywood is usually utilized when rafters exist as 16”OC.

Roofing Materials: Asphalt shingles are considered as the most effective roofing material for residences.
Standard weight is 235 pounds per square.
A “square” of shingles contains 100 square feet.
A layer of 15-pound saturated-felt building paper is generally arranged among the sheathing and shingles.

Closure Strips, Joints and Favorable Pouring Sequences

Brief overview of Roof Truss

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