Originally Posted by Sunset
Guess you don't know roofers who do it to spec, or you don't have any winds in your area.
Owens Corning Roofing: Estimating Materials for your Roofing Project
You will also need to determine the amount of nails you'll need. Generally, you should use four nails per shingle. For regular three-tab shingles, this would require 320 nails per square. For high wind areas
or when shingles are being applied to a mansard, six nails per shingle are required
(480 nails per square). This is based on 80 shingles per square."
Originally Posted by ponyboy
This is a biased opinion from a company that makes money from consumers. You can put as many nails in as you want...its not going to hurt anything. Whether is necessary or not is a matter of opinion. Ive never come across real data that supports this claim.
+1@Sunset. This is why newer building codes in high wind areas, such as South Florida, mandate more and longer nails, and carefully inspect installation. It's not just the cost of the nails, it's also the additional labor. All extra cost for the roofer, so not something typically proposed by a fly-by-night type. Short or insufficient nails are a problem 10 years down the road, when shingles are loose, nails bent and rusting, and rot sets in the wood.