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Exposure
Exposure is the measure of material that is vulnerable to the weather. When you apply either
shingles or clapboards to the side of your home, exposure
will help to determine how much material you need in order to cover the entire wall.
The greater the amount of exposure you allow, the more area that siding will cover. However, it
also means that the layer of material is thinner, and so may be more vulnerable in the long term.
For example, clapboards generally have an exposure of 4"
to the weather. The clapboard itself usually measures 1/2" x 6"
so the courses of siding overlap by approximately 2". The wedge shape helps to thicken the
layer of siding, and still allows for the material below to breath.
In the case of shingle siding or roofing shingles,
exposure is just as important. Too much material exposed means less protection, but too little material
exposed can mean wasted time and money. Between these two extremes, there is some room, though.
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