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17180 Mallard CT
Eden Prairie, MN 55346
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Bob's Credentials:

  • Licensed: BC544370, $2 million liability insurance coverage and bonded
  • Specializing in residential roofing since 1992
  • Has personally repaired and installed hundreds of roofs (2,000 roofs and counting)
  • Certified CertainTeed® Select ShingleMaster™ Installer
  • Bob has attained a greater knowledge of roofing materials, installation and roof ventilation systems through continuing education classes.
  • Zero complaint history with the BBB and Minnesota Department of Labor and Industry
  • Trusted and knowledgeable roof inspector for insurance agents and homeowners
  • Knowledgeable hail and storm damage inspector

Services Include:

  • Free roof estimates, roof tear-offs, re-roof, roof repairs, metal roofing, seamless gutters and siding


  • Our personal 20-year transferable craftsmanship warranty, plus lifetime roof warranty from the shingle manufacturer. Double coverage is always a good thing!

Product Recommendations:

  • Landmark™ Shingle, StormMaster® Shake Shingle, Duration® Shingle, Duro-Last® for flat roofs

Visit our Contact page for information on how
to request a free estimate.

Referrals welcome!



Stress Cracking: What is it, and How Does it Develop?

Stress cracking in roofing shingles is caused by sudden climate shifts, which are quite common in Minnesota. In the summer, hot days and intense sunlight can scorch roofs, often raising rooftop temperatures 50–75 degrees (Fahrenheit) above the ambient temperature. Introduce a sudden thunderstorm to these conditions and, almost instantaneously, rooftop temperatures can drop 60–100 degrees. This rapid temperature change creates "thermal shocks" within the shingles. Thermal shocks cause the shingles to expand and contract, placing significant strain on the material. Combine this strain with high winds, as well as pounding rain or hail, and conditions are ripe for cracking.

Stress cracking, as shown above, is common on Minnesota roofs. The cracking is often discovered by home inspectors after a home is put on the market. A roof containing several stress cracks can hamper, or even jeopardize, the sale of a home.

Though common in summer, thermal shocks have a greater chance of occurring in winter. The sun can heat up the southern and western sides of a roof, causing it to expand. Once the sun sets a rapid cool down can occur, causing the shingles to contract which, again, puts a strain on the shingle material. Year after year this process is repeated, resulting in a cyclic fatigue that commonly leads to stress cracking. If the shingle is not thick enough or built strong enough to handle this movement, something inevitably gives. The result? Shingles that are riddled with stress cracks, greatly shortening the life of your roof.

How do you combat stress cracking? Buy products that are made from better materials and built thick enough to handle thermal shocks. For example, one of the main components of a shingle is asphalt. Low quality asphalt can be brittle and cause the shingle to have a shortened life. High quality asphalt keeps the shingles more flexible. The amount of asphalt used gives the shingle it thickness and much of its weight, and adds to its strength.

Recommended shingles built to survive Minnesota's harsh climate include:

  • Landmark®: The heaviest shingle on the market, made from quality asphalt and fiberglass matting. Consumer Reports rates Landmark as one of the best shingles made.
  • StormMaster® Shake: This product is made from a SBS rubber filler which gives it great flexibility.

All information on this page is provided by J. Robert Roofing.

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A Minnesota Roofing Company and Contractor Serving the Twin Cities of Minneapolis and St. Paul including the South Metro.
17180 Mallard CT • Eden Prairie, MN 55346 • 612-998-1673

© J. Robert Roofing, LLC