There has always been a lot of controversy in the construction industry on how to
properly nail the underlayment or whether it's even necessary. Some roofers use regular
roofing nails, some use staples, some attach it with hardly any nails at all, using only a
single nail every few feet. It's not that roofers are trying to rip anyone off, they just
don't see the need for nailing the underlayment so heavily since the shingles do such a
fine job of securing the underlayment.
RoofHelp, and all other professional roofing organizations, consider properly nailed underlayment to be an important part of the roof
assembly. It acts a secondary waterproofing element plus it provides
longevity for the roof system, click HERE for a brief explanation. There have been several occasions
where shingles have blown off in heavy thunderstorms or hurricanes but because the felt underlayment was nailed securely, the damage to the interior of the building was
minimized.
RoofHelp has two ways of nailing the felt - one for high wind regions and one for all
other regions. If you often experience winds of 50 mph or more, you should seriously
consider the high wind method of nailing.
