[[FAQS and GUIDES]]


==== Common Roofing Mistakes =====

    *   Single plies: Poor, inconsistent welds, improper fastener spacing, and unadhered base flashing.
    * Hot bituminous: Inadequate temperature control of asphalt, poor interply integrity and dry laps.
    * Torch-applied modifieds: Fire safety concerns, over/under torching and voids in seams.
    * Steep slope: Improperly spaced decks, buckled plywood, no waterproofing underlayment installed in valleys, and improperly installed step flashings.
    * Cold-applied roofs: Improper materials storage and seaming problems at the selvage edge and end laps.
    * Roof decks/subtrates: Under-driven fasteners, incorrect attachment patterns, and loose or damaged insulation.

-http://www.rsimag.com -- Mike Russo - 



===== Residential roofing - Not cutting the valley tips back =====


A common valley area shingling mistake made by many novice roofers and DIY homeowners.

[[http://roofersreview.com/v/Common+Roofing+Mistakes/Common+Roofing+Mistakes06.jpg.html|{{http://roofersreview.com/roofing pictures/valley points.jpg}}]]

Heavy rainfall flowing down the roof valley will catch the points of the asphalt shingles and run horizontally along the top edge and under the shingles. When the water finds a hole in the underlayment it will run into the attic and then the house.
This shingle and all others that end with a point in the valley should be trimmed back from the waterline. Simply cut the shingle at a 45-90 degree angle a minimum of 2 inches back from the point.

[[http://www.roofersreview.com|RoofersReview : Roofing Contractors Roofing Pictures]]