Q: We had a new roof installed on our house in the Sierras. The roof is a 12-in-12 pitch (45 degree) and is approximately 17 squares (1,700 square feet). We contracted for a 30-year Elk brand composition roof with 30-pound felt underlayment. The instructions require a ridge vent system, without which the manufacturer's warranty would be void. We told the roofer this. There is full wood sheeting on the roof. The instructions require a 3/4-inch opening on either side of the ridge beam to allow air flow. My biggest concern, though, is that the roofer applied 15-pound felt -- not 30-pound -- in a vertical direction as opposed to the horizontal overlap. The contractor maintained that the felt is frequently installed this way. But code and the manufacturer's instructions say that felt...
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