Cost of Metal Screws for Gable Roof

The Cost of Screws for a Metal Roof calculator computes the number of special screws needed for a metal gabled roof. 

INSTRUCTIONS:  Choose units and enter the following:

• (L) Ridge Length of Roof
• (S) Span of Roof
• (oH) Overhang 
• (P) Pitch of Roof
• (uP) Unit Price of Metal Panel Screws (Default: $0.09 USD per screw)

Cost of Screws for a Metal Roof (TC): The calculator returns the number of screws needed for a metal roof and the associated cost.  The calculator also returns the Surface Area of the Roof.

The Math / Science

Ag Panel Metal roofs are typically connected to purlins or sub-boards using special screws that self-start through the metal and have a rubber collar to seal out water (see image).

The Total Cost of Screws for a Gabled Metal Roof calculator computes the area of the roof based on the ridge length, span, overhang and pitch of a gabled roof (see diagram).  It then calculates the number of screws needed based on 75 screws per 100 ft² of roof.  Once the number of required screws is known, the formula for the total cost of metal screws for a gabled roof is:

TC = nS * uP

where:

• TC = Total Cost of specialty metal screws for a gabled roof.
• nS = Number of Screws
• uP = Unit Price per Screw

The default unit pricing of $0.09 USD per screw is from an Ag Panel pricing survey that includes the unit price of metal panel screws.

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