The Master Roofers Guarantee Corporation (or “MRGNB”) is set apart from other roofing organizations via the standards set forth in it’s specification manual, which, when adhered to results in a start of the art product. A roof constructed by a member of the MRGNB can be regarded as a “high end” product, one what will meet and often exceed customer expectations. In the roofing industry, this is referred to as a roof that performs.