ESTIMATICS
Area of a square or rectangle - Answer-Base x Height
Area of a triangle - Answer-1/2 (Base x Height)
Area of a trapezoid - Answer-[(Base1 + Base2) / 2] x Height
Area of a circle - Answer-pi (3.14) x radius of the circle
Top chord - Answer-serves as a roof rafter
Bottom chord - Answer-serves as a ceiling joist; the length of this chord is the "span"
Webbing - Answer-bracing that ties top and bottom chords together
Gussets - Answer-wood or metal plates that hold the pieces together at the joints
On-Center (o.c.) of the trusses - Answer-is the distance from the centerline of one
framing member to the center of the next framing member
3 - Tab Composition shingles - Answer-these range from 200 lb. to 240 lb. and are
packaged three bundles per square
Waste for a gable roof - retangles - Answer-10%
Waste for a hip roof - trapezoids and parallelograms - Answer-15%
per square for comp shingles - Answer-assume 3 bundles (.33, .67, 00)
per square for wood shingles - Answer-assume 4 bundles (.25, .50, .75, 00)
removal of shingles - Answer-estimate for the actual number of squares
replacement of shingles - Answer-include waste in the calculation, 10% or 15%
according to the material
carpet - Answer-12' wide
stud walls - Answer-4" thick
walls - Answer-8' tall
Laminated Shingles - Answer-range from 240 lb. to 500 lb.; come three or four or
more bundles per square, and medium to heavy weight shingles
Wood Shingles - Answer-are manufactured in random widths and are normally 16",
18", or 24" in length
Area of a square or rectangle - Answer-Base x Height
Area of a triangle - Answer-1/2 (Base x Height)
Area of a trapezoid - Answer-[(Base1 + Base2) / 2] x Height
Area of a circle - Answer-pi (3.14) x radius of the circle
Top chord - Answer-serves as a roof rafter
Bottom chord - Answer-serves as a ceiling joist; the length of this chord is the "span"
Webbing - Answer-bracing that ties top and bottom chords together
Gussets - Answer-wood or metal plates that hold the pieces together at the joints
On-Center (o.c.) of the trusses - Answer-is the distance from the centerline of one
framing member to the center of the next framing member
3 - Tab Composition shingles - Answer-these range from 200 lb. to 240 lb. and are
packaged three bundles per square
Waste for a gable roof - retangles - Answer-10%
Waste for a hip roof - trapezoids and parallelograms - Answer-15%
per square for comp shingles - Answer-assume 3 bundles (.33, .67, 00)
per square for wood shingles - Answer-assume 4 bundles (.25, .50, .75, 00)
removal of shingles - Answer-estimate for the actual number of squares
replacement of shingles - Answer-include waste in the calculation, 10% or 15%
according to the material
carpet - Answer-12' wide
stud walls - Answer-4" thick
walls - Answer-8' tall
Laminated Shingles - Answer-range from 240 lb. to 500 lb.; come three or four or
more bundles per square, and medium to heavy weight shingles
Wood Shingles - Answer-are manufactured in random widths and are normally 16",
18", or 24" in length
