Standard installations require 4 nails per shingle. Very steep slopes (Mansard) and high wind areas require 6 nails. The rational for only using 4 nails is that is all it takes to do a quality job in most cases. The most critical thing to worry about is proper nail placement. 4 nails in the right place are far better than 6 in the wrong. Many roofers in a hurry to complete the job nail above the nail line. This will void any warranty and make the roof more prone to wind damage. All of this is clearly written on the bundle wrapper of the shingles. Having said that I am not against using 6 nails I just wouldnt pay a whole lot more to get it if I didnt need it. Here is a link to the National Roofing Contractors Association that gives a lot of good information including some more questions you should be asking these roofers. http://www.nrca.net/consumer/default.asp鈥?/a>How many nails are necessary per shingle sheet when installing a roof?
It all depends what kind of an area you are in if its high winds you need 6 to keep the shingle from blowing off but 80% of the time you are better of with just 4 nails it decreases the chance of a leak it also should say on the bundle of shingles each manufacture has different specs and will not warranty the shingle if this is not carried out
Number of nails used depends on your shingles. Most shingle manufacturers state how many nails to use for each shingle. If you look at a shingle, it has three tabs. The 4 nail guy will probably put a nail at each end of shingle and then a nail in the middle of each tab- that would be 4 total. The 6 nail guy is probably going to put 2 nails per tab- evenly spaced.
If there is a big price difference- more than a couple hundred dollars- go with the 4 nail guy.
Also, you can do a search online- type in- ';replacing shingles';- and this will provide you with info as well.
When I did my own roof about 17 yrs.ago I only used 3 per on 25 yr. shingles. I haven't had any probs yet after winds near 50 MPH and don't anticipate any. IMO, 4 would be sufficient unless you are in a very high wind area like a hurricane zone.
More important is getting a good bond with the tar strip on the overlaying shingles. This dramatically reduces damage from wind lift when compared with a roof that hasn't had the chance to set. A good strong Sun can do the job in a day.
This is an uneducated guess because i'm no roofer but with 4 nails I think it leads to more chances of leaks down the road. The Nails keep shingles in place from wind, rain ect so with 4, it's less resistence to stronger winds. I think 6 gives the shingles more stability. I'd go with the 6 as the guy with 4 probably wants to save on nails.
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