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Nashville Home Inspector - Roofers Gone Wild - How to Mess Up a Perfectly Good Roof
Nashville Home Inspector - ROOFERS GONE WILD - HOW TO MESS UP A PERFECTLY GOOD ROOF  
by Richard Acree  
http://habitecinspections.com  
At HABITEC Home and Building Inspections, LLC, we sometimes see situations during a Home Inspection and we wonder just what were they thinking.  It seems like they did things wrong just to say they could.  Look at the picture of the roof shingles below.  What's wrong?
HINT: Water flows downhill, and this picture was taken from a roof top. 
 
ANSWER:  Actually this is wrong from whatever angle you look at it.  In any condition, whether in a valley as shown or on a slope of the roof, composite roof shingles should always be installed so that the shingles overlap from the top down.  In other words, the upper shingle overlaps the lower shingle.  In this photo, the shingles from one side of the valley were simply carried over on top of the other side, in the forefront.  That puts the downslope shingles above the upslope shingles.  It won't take much for water from upslope shingles to slip under the downslope shingles and onto the decking below.  This is a poor roof valley shingle installation.  The picture below is how ... more

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