Representing quality moisture protection companies throughout Minnesota, Wisconsin, North Dakota and South Dakota since 2001.  Allen has over 20 years representing quality roofing and waterproofing manufactures in the 5 state region.  Allen is a graduate of the University of Minnesota.

Added Value on Every Project



Gehrke and Associates has over twenty years representing some of the biggest names in integrated building envelope materials.


Our knowledge and best of class service will save you money on your projects in the long run. We help you find the best options for a specific application and will also help during the specification process.

Our extensive experience and knowledge roofing and waterproofing structures is our biggest asset. Assisting in having the correct detail and the correct product for the application in our highest priority.  Quality architectural products, American Hydrotech, Polyguard and Situra ensures that we have you covered.

American Hydrotech MM6125 ®, the original rubberized asphalt membrane and the best roof system for Garden Roof and all critical roofs.   MM6125 has been entrusted for almost 50 years with keeping high profile structures across the country and around the globe watertight.

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