<h2>Just How To Apply Roll Roof</h2> Prevent this by putting down an underlayer in the roof for about 3 feet or two to include an extra layer of protection against melting ice water. Improper use of nails.Shingles can slip down if they aren't nailed properly or if too few nails have actually been used. <h2>Felt over roof covering drip edge or drip side over felt? Obtain the proper answers right