It’s All in the Numbers When It Comes to Metal Roof Installation

By Gerry Donaghue • November 4, 2022
It’s All in the Numbers When It Comes to Metal Roof Installation
It’s All in the Numbers When It Comes to Metal Roof Installation

All do it yourself projects require vast amounts of planning and dedication in order to bring them to completion. Some DIY projects around the home are simple, yet others are more complicated. One such complicated project is that of the metal roof installation. First and foremost, before beginning a roofing project, you should be aware of the local building codes, especially if you are trying to install a metal roof over shingles. However, some of the most common mistakes made when installing metal roof systems involve mathematical calculations. 

  • Improper measuring. Roofing requires exact measurements. Before even beginning to measure, you should take several pictures of your roof from different angles to use as a guide to making sure all sides and portions of the roof, including eaves, gables, windows, and chimneys are taken into account. 
  • Not factoring in roof pitch. To ensure that you have the right number of tiles and the proper of overlay for a metal roof installation, it is important to compensate for the angle of your roof in your calculations, which is referred to as pitch. The pitch is determined by multiplying how many vertical inches, called the rise, are extended for every 12 inches horizontally, called the run. 
  • Not converting measurements to tile size. Installing metal roofing is an expensive venture. Though metal tiles come in varying styles and sizes, they can range into hundreds of dollars per tile. In addition, once metal tiles are cut, it is not possible to correct any mistakes. 

Mathematical mistakes can be costly when it comes to metal roof installation. When attempting this type of installation as a do it yourself project, you should make sure that all your measurements are correct at the onset; otherwise, the rest of your calculations will be off. There are several ways to ensure accuracy in the numbers you are using. Visit this site for help with the measurement calculations and pricing options.

February 17, 2025
Welcome to our new website for GT Donaghue Construction & Metal Roofing, LLC! We are so excited to roll out a much needed refresh on our website and share it with all of you. And with a new website comes a reintroduction to us here at GT Donaghue Construction! For those not familiar with us, GT Donaghue Construction & Metal Roofing, LLC (formerly Donaghue Construction) has been in business for almost 40 years working across New Hampshire, Vermont, Maine, and even parts of New York bringing quality craftsmanship and decades of experience to all the projects we complete. Gerry Donaghue, our founder, started this business out of his house formerly in Nashua, NH and has sustained a quality business over the years through hard work and resilience. We have navigated fluctuations in the industry across the years with some years only allowing for a few members on our crew and some calling for multiple crews and larger partnerships. The one thing that hasn’t changed? Gerry’s commitment to high standard work and building relationships with the folks he serves. A family owned business, his daughter Ashley supports him on his admin team (after she did her time driving the dump truck for him as a teenager!), his brother Andrew works on the job site, and his wife Pat has always been there to help when needed-you can sometimes see her in the office or even at a home show! Gerry has a wealth and variety of experience ranging from ground up new builds, additions and interior remodels, deck installations, siding replacements and installations, and of course his favorite-metal roofing installations. Whether it is a unique custom job or a traditional upgrade, GT Donaghue Construction & Metal Roofing can help you out! We hope you enjoy our new website and feel free to reach out to us when we can help at your house!
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