The exterior of the house is what "welcomes us home". From landscaping to new siding to upgraded window or replaced roofing, the view from the street can be just as exciting as the interior space. When the roofing of the house is a significant architectural component, materials other than asphalt shingles have often been used. Many who love houses especially love those old slate and tile roofs. Some more rustic houses may sport a wooden shake or shingle roof though many such roofs are forbidden in fire prone areas.
The asphalt shingle roofing of old may not even be a close resemblance to what is available today. Certainly the newer architectural grade asphalt shingles cost more but in many cases they provide an appearance resembling slate, tile, and wood.
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The home inspector is seen picking up the asphalt shingles at the eave and rake edge of this roof. He is examining the placement of the drip edge flashing. The drip edge along the rake edge of the roofing system is set over top of the roofing felt. This exists so that if rain blows in under those shingles along the rake edge it will travel out onto the roofing felt and run down the roof slope.
At the eave edge, the drip edge flashing is secured to the roof sheathing and then covered over with the roofing felt. The reason for this is so that if water gets to the roofing felt anywhere on the roof slope it will run down the slope and will travel over the eave edge.
It is quite common for drip edge flashing's to be installed improperly. When the eave edge flashing is installed incorrectly, water will often run under the flashing and cause the roof sheathing to get wet and gradually deteriorate. The same can happen along the rake edge.
Quite often, roofing systems are installed without benefit of any drip edge flashing's. Those roofing systems are often found with deteriorated roof sheathing several years after the installation.