Metal for Gambrel Roof

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The Metal for a Gambrel Roof calculator computes the length and number of metal panels (ag panels) needed for a gambrel roof based on the dimensions. It also provides the length of the trim pieces.

INSTRUCTIONS: Choose units and enter the following:

(L) Ridge Length
(S) Span of Roof
(P₁) Lower Pitch
(P₂) Upper Pitch
(LH) Loft Height
(oH) Overhang
(PD) PANELS or DETAILS

Gambrel Roof Area (A): The calculator returns length and number of panels for a gambrel roof. The lengths can be automatically converted to compatible units via the pull down menu. If DETAILS are chosen, the calculator also returns:

(RC) Ridge Cap: length of the ridge cap.
(GT) Gable Trim: total length of gable trim, equals four times a gable length
(nP) Metal Panels: number and length of metal panels for the roof.
(TPL) Total Panel Length: linear feet of metal panels for roof.
(MS) Metal Screws: number of screws needed to attach panels to roof.
(SG) Snow Guard: total length of snow guard, equals twice the ridge length.
(AT) Angle Trim: total length of angle trim (used as facia).
(A) Area: area of the roof in square feet.

The Math / Science

For this calculation, the panel width is assumed to be 36"

Gambrel Roof Calculators

Gambrel Roof Surface Area: This computes the total surface area of a gambrel roof, and the number of 4x8s and bundle of shingles needed for a roof based on the dimensions below.
Trusses Needed for Roof: This computes the number of trusses needed for a roof based on the ridge length and spacing.
Sheathing for Gambrel Roof: This computes the number of 4x8 sheets to cover a gambrel roof based on the dimensions of the roof. It also includes the number of framing nails needed to nail the sheets to the roof based on whether clips are used or blocking.
Gambrel Roof Shingles: This computes the number of bundles of shingles and ridge shingles needed for a gambrel roof based on the dimensions and bundle coverage.
Roofing Nails for Gambrell Roof: This computes the number of roofing nails to shingle a gambrel roof based on the dimensions and wind conditions.
Underlayment for Gambrel Roof: This computes the total surface area of a gambrel roof for underlayment based on the dimensions below and the estimated cost based on the area and unit price of underlayment material
Purlins for Gambrel Roof: This computes the length and number of rows of purlins needed for a gambrel roof based on the dimensions
Metal Panels for Gambrel Roof: This computes the length and number of vertical metal panels needed for a gambrel roof based on the dimensions. It also provides the length of the trim pieces.
Horizontal Siding for Gambrel Wall: This compute the number of horizontal siding panels (e.g., vinyl or cedar) for a wall under a gambrel shaped roof line.
Screws for Gambrel Metal Roof: This computes the number of screws to attach metal panels needed for a gambrel roof based on the dimensions. It also includes the total square feet and the number of metal screws needed at 0.75 screws per square foot.
Metal Panels for Gambrel Wall: This computes the number of vertical siding panels, their lengths and the total length of vertical panels on a wall under a gambrel roof. It also includes the total square feet and the number of metal screws needed at 0.75 screws per square foot.
Gambrel Pitch Angles: This computes the upper and lower pitch angles and rafter lengths bases on the span, total height, and height and width of the loft.
Gambrel Rafter Lengths: This computes the upper and lower rafter lengths, loft width and total height based on the upper and lower pitch, span and loft height.
Gambrel Angle: Compute the interface angle where the two pitched surfaces meet on the roof.
Screws for Metal Siding Gambrel End Wall: Computes the number of metal panel screws needed for vertical metal panels on a wall under a gambrel roof.

Metal Roof and Siding Calculator

Functions for roofing and siding using metal panels and trim to compute the number of metal panels, trim and screws for various shaped roofs and walls based on the dimensions of the building.

Metal for Gable Roof: This estimates the materials needed for a simple gabled metal roof based on the roof dimensions.
Metal Siding for Gable End Wall: This estimates the vertical metal siding panels for a wall under a gable end based on the dimensions.
Metal Siding for Gable End Wall with Door: This estimates the metal siding materials for a wall under a gable end with a door based on the dimensions.
Metal Siding for Wall: This estimates the metal siding materials for a rectangular wall based on the dimensions.
Metal for Dormer Roof: This estimates the metal panel and trim materials for one or more roof dormers based on dimensions.
Metal for Gambrel Roof: This estimate the length and number of metal panels needed for a gambrel roof based on dimensions.
Metal Panels for Gambrel Wall: This computes the number of vertical siding panels, their lengths and the total length of vertical panels on a wall under a gambrel roof. It also includes the total square feet and the number of metal screws needed at 0.75 screws per square foot.
Metal for Hip Roof: This estimates the metal roof materials for a hip roof based on dimensions.
Metal for a Pyramid Roof: This estimates the metal roof materials for a pyramid hip roof based on dimensions
Metal for a Shed Roof: This estimates the total number of metal panels and lengths of trim needed to cover a single sloped roof based on dimensions..
Metal for Shed (Roof and Walls): This estimates the total number and length of metal panels for the roof and walls based on the ridge length of the roof, the front and back heights, the width of the shed roof building and the front and back overhangs. See simple ag run-in below.
Pole Barn Materials: This uses an estimated the linear feet of metal panels needed for a pole barn with a door way, and provides an estimated cost for the metal panels for the roof and siding based on a the dimension and cost per linear foot of panels.
Pole Barn Metal Roof and Siding Cost: This uses an estimated the linear feet of metal panels needed for a pole barn with a door way, and provides an estimated cost for the metal panels for the roof and siding based on a the dimension and cost per linear foot of panels.
Screws for Metal Gable Roof: This estimates the number of metal panel screws needed for a gable roof based on roof dimensions.>
Screws for Metal Siding on a Gable End: This computes the number of metal panel screws needed for metal siding for a wall under a gable roof end based on the dimensions.
Screws for Metal Siding on a Gable End with Door: This computes the number of metal panel screws needed for metal siding on a wall under a gable roof with a doorway based on the dimensions.
Screws for Gambrel Metal Roof: This computes the number of screws to attach metal panels needed for a gambrel roof based on the dimensions.
Screws for Metal Siding Wall: This computes the number of metal panel screws for metal siding on a rectangular wall based on the dimensions.
Corrugated Metal Paint or Coating Volume: This estimates the volume of paint or other coating (e.g., spray insulation) is needed for a corrugated surface.

Materials for roofs, walls and dormers include panels (number and length), panel cut angle, the number of required metal panel screws, lengths of ridge cap, gable trim, angle trim, snow guard, purlins (number and length), surface area and ridge and valley lengths where appropriate.

Ag Panel Pricing

There are several price points for metal roofing and siding, but the common Agriculture Panel (Ag Panel) is widely used and often the most economical. Ag Panel metal has reached the point where it is less expensive as a roofing material than common asphalt shingle. For this reason, Ag Panel pricing is provided from a survey for convenience.

The C-Lok, Ag Panel, G-Rib price survey includes the following for the most recent pricing surveyed: polebarn with metal roof and metal trim

Date Survey: 3/7/24
Source of Pricing Source: CN Metals
Cost per Unit:
- [$3.19 USD/ft] - Panel (36" wide) - dollars per linear foot
- [$0.09 USD/screw] - Screws (with seal gasket) - dollars per screw
- [$1.74 USD/ft] - Ridge Cap - dollars per linear foot
- [$1.84 USD/ft] - Outside Corner (trim) - dollars per linear foot
- [$1.25 USD/ft] - Snow Rail - dollars per linear foot
- [$2.85 USD/ft] - Drip Edge - dollars per linear foot
- [$0.2 USD/ft²] - Fanfold Insulation - dollars per square foot

NOTICE: Before risking health or wealth on calculator results, confirm calculator estimates with a professional sources and ALWAYS ADHERE to LOCAL BUILDING CODES.