The black stain on light colored is a fungus or moss,Usually on the north side only.Notice that the shingles will be clean below lead flashed chimneys and antenna mounts.Light colored shingle wont get as hot as black in summer.A strip of zinc or bare copper wire run along the ridge will keep the fungus from forming.There are sprays that will kill moss on shingles.A coat of aluminum paint will make shingles last longer.I had 5 gallons of aluminum roof coating that I put on the barn stable roof.The shingles that were coated looked much better when we put on new shingles.Put a white shingle and a black shingle in the sun for a while.Touch each one after a few hours in the sun.Most people are going to metal roofing here because new shingles are not lasting.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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