Manufacturer Specifications


An experienced roofer will not cut corners or skimp on all the essential components of a roof. Doing so will make the roof less durable and in some cases may void the manufacturer’s warranty.


The roof is much more than just the shingles that are visible from the top layer. A sound roof begins with an underlayer of plywood sheeting covered in a weatherproof membrane, called roofing felt. This layer seals the roof off from rain, snow and ice. Imperfections in this initial layer can undermine the integrity of the roof and wrinkles or bumps in this layer can create an uneven surface for the application of shingles.


The importance of flashing can be overlooked by budget roofing contractors. This roofing component is a metal or plastic material used to divert water from places that it may collect on the roof. Flashing should be used on the seams of the roof called “valleys,” as well as around chimneys, dormers, vents and skylights. Flashing diverts the water away from these areas, helping to prevent water damage to your home and roof. An additional leak barrier material such as Weatherwatch or Stormguard can be used under the flashing in vulnerable roof areas to provide a more durable and effective seal from the elements.


The roof shingles or tiles are the outermost layer of the roof. They come in a variety of styles and colors to complement the look of your home, but their most important purpose is to protect your home from the elements. Shingles and tiles must be properly installed based on manufacturer’s instructions to make sure you are covered by their warranty. Improper installation can also cause shingles to detach from the roof. Experienced roofers will know how to properly install shingles for the particular style of your roof and for the weather conditions in your area.


It is not recommended to install a new roof without first removing the old one. Your old roof is not a good foundation for your new shingles and existing problems in the current roof such as leaks or rotted areas will not be addressed if the old roof is not completely removed. Placing the new roof on top of the old one may seem like a cost-effective solution at first, but is likely to create costly problems in the future and is not durable.

Don’t place your roof in the hands of inexperienced or unprofessional workers. Duffy’s roofing professionals will mind all the details and components of a new roof installation to provide you the best job possible for your investment.


Roofing Warranties


Most manufacturers provide a warranty on shingles and installation for a minimum of 25 years. Duffy is a certified installer of the GAF roofing system, which includes a warranty of up to 50 years on many shingle types.

The warranty gives you additional peace of mind by providing replacements for any defective products in the roofing system and covering any repairs necessary due to misapplication. A new roof is a large investment and the warranty prevents you from incurring any additional costs for these types of issues.  


The manufacturer’s warranty also assures you that the roof is being installed in the approved way, as your roofer will need to follow the manufacturer’s recommendations so that your warranty is not voided.

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