Gutter Calculator

The Gutter Calculator can be used to determine required minimum gutter size, downspout size, and downspout spacing for your roof perimeter. By choosing include GT-1, the calculator will also provide the required perimeter and corner pressures to meet the ANSI/SPRI GT-1 requirement.

ANSI/SPRI/FM 4435/ES-1 Calculator

Enter the building characteristics to calculate the design pressure your roof edge will need to meet or exceed in order to comply with ANSI/SPRI/FM 4435/ES-1. This calculator will also provide the basic wind speed for your region and a list of recommended Metal-Era products suitable for your project.

Attic Ventilation Calculator

The Attic Ventilation Calculator will help you calculate the Net Free Area for your project and the necessary vent width for your ridge vents or vented fascia products. Please enter either the square feet of attic space or the NFA that your project requires and the vented eave and ridge length. For nail-base ventilated roofs, please use our Nailbase Ventilation Calculator.

Nailbase Ventilation Calculator

The Nailbase Ventilation Calculator will assist you in determining the ideal airspace relative to your project's ventilation needs. Input the values for your project, and the results will be graphed to illustrate the effectiveness of the proposed system. For attic ventilated roof systems, please use our Attic Ventilation Calculator.