Phone: (603) 365-7156

GAF Roofing Contractors


Here at Derek Cook Roofing Specialist’s, we are GAF Factory Certified, meaning you’re getting the best possible installation and roofing service as a whole that you can.

We take pride in our GAF Master Elite status. In order to become master elite certified, you must fall check off the following criteria. If you think about it, a homeowner shouldn’t trust a contractor unless they check all of the following boxes.

  • Properly Licensed
    Licensed by their state (or province) to perform roofing work*
  • Adequately Insured
    for your protection
  • Proven Reputation
    for providing quality roofing services throughout the community
  • Committed to Ongoing Professional Training
    to ensure quality installation

GAF has some strict standards because they really only want to recommend the best of the best. In fact, only 3% of all roofing contractors have qualified as a Master Elite Contractor.

The reasons for this award is also for the homeowner. By choosing a GAF Master Elite contractor, you’ll know you’re dealing with a quality, reputable, and dependable professional contractor and not someone that will pull one over on you.

FACT: 93% of property owners would recommend their GAF Master Elite Contractor to others!**

**Based on a survey of over 28,000 property owners in the U.S. served by GAF factory-certified contractors.

Why Derek Cook and GAF?

At Derek Cook Construction, we are committed to going above and beyond when it comes to all of our roof replacements, installations, and repairs. We have the expertise to properly install GAF roofs through becoming Certified Master Elite Contractors and all our of roofing work in the Manchester NH area. Matching a high-quality product with professional craftsmanship is important because if your new roof isn’t installed correctly, it will need to be replaced much sooner than expected. Our team knows the difference between a repair and a full replacement, we don’t unnecessarily up-sell customers. You can trust our team at Derek Cook Roofing Specialists with your new GAF roof, from beginning to end. If you’re in the Manchester, NH area and are in need of expert roofing contractors, contact our team today!


Recent GAF Roofing Job

Front of a houseDerek Cook’s Roofing Specialists installed this new roof for the residents of this Londonderry NH home. The house had a very old asphalt shingle that needed to be replaced, and they needed a trusted team to help them out. We worked directly with the homeowners and were able to find the perfect shingle color that complements the home’s style, and the homeowners loved it.

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How is GAF Different?

We understand as a homeowner that there are options out there for companies to install your new roof and for materials to go on your roof. We fully believe that GAF is the best roofing manufacturer for asphalt shingles and here’s why:

  • GAF’s Timberline shingles is Americas #1 selling shingle…. that means ALOT!
  • Each GAF shingles pass both the Class F(110mph) and Class H(150mph)  wind test.
  • Home builders have ranked GAF as the #1 rated shingle for 10 out of the last 12 years.
  • Women’s Choice award winner in 2012, 2013, 2014, 2015 & 2016
  • GAF is the first company to install a energy-efficient shingle
  • & so much more!

Our Roofing Services


Call Now: (603) 365-7156