This type of shingle does allow moisture to escape from the attic areas in vapor form, while the insulation retains the heat. Regular asphalt shingles are designed to have an expected economic life span of 16-20 years. Having a south exposure may shorten the roof life as hotter temperatures will prevail. The newer heavier shingles can experience about five years additional life. Asphalt shingles are usually installed over wood sheathing boards after an underlayment is affixed to the the sheathing.
Some codes require the first few feet to be in a special material.
Checking in the community the home is located in will reveal the codes. The sheathing is then nailed to the roof framing members. Gutters and Downspouts Roof drainage systems are usually needed to control the removal of water, unless the home is designed with large overhangs or has no basement. Gutters should be installed to prevent damage to exterior walls and foundations. Gutters are usually spiked into the wood or hung along the eves of the roof.