Roof deck performance can have a strong effect on the performance of your roofing shingles. The objectives of this Rochester roofing blog are; 1. to help you understand how the building design, deck construction and deck materials affect the entire roofing system and the warranties on the roofing products, and 2. To be able to identify deck related problems.
When roofing in Rochester NY, a roof deck is the structural surface that you are going to install your roofing system over. The roof deck should be a smooth, solid surface and must be strong enough to:
· Support the roofing material and workers
· Hold heavy uniform loads like snow/ice
· Anchor nails properly
· Resist heavy wind force when fastened properly
If you apply a new shingle roof over a roof deck surface that is unacceptable to the shingle manufacturer and damage occurs the warranty might not cover the damages. Acceptable decking’s are exterior plywood, oriented strand board (OSB) which we recommend a minimum of 7/16 thickness, and COM-PLY. These roof deck materials have proven to stand effective over time. These decks are acceptable for direct application of asphalt shingles over them. Various wood boards are acceptable roofing decks by manufacturers, but these can sometimes expand and shrink more than an asphalt shingle can take, causing cracking, splitting, or buckling of the shingles.
To prevent any buckling of your new roof or roofing deck, make sure your deck is properly ventilated. Proper roofing ventilation between the underside of the roof deck and the attic insulation is ¾ space between the deck and the insulation from peak to fascia is required by most shingle manufacturers. Also make sure you allow 1/8” between OSB and plywood sheeting for swelling and shrinking. If new roof deck sheeting is to be installed make sure to install nail fasteners every 6” on the rafters and sheeting end seams.
Now that we have identified what a roofing deck is and what an acceptable roof deck is to a shingle manufacturer, let’s discuss how to identify deck related problems.
· Upward buckling/splitting of shingles – seams of sheeting or boards can become unfastened and warp upward actually tearing through roofing material.
· Sagging/dips – water intrusion or attic space moisture can weaken the structural integrity of any roofing deck
· Mold, mildew – inside the bottom of roof deck rafters. Improperly vented roof decks can result in high moisture and temperatures which easily breed mold and mildew in attic spaces.
The best roofer in Rochester NY, Ron Ferris and Son, prefers to gain entry to the attic space of potential roofing. It allows us to assess your roofing ventilation system and get a better feel for the condition of the existing roof deck.
For more tips or Rochester NY roofing visit us at www.ronferrisandsonroofing.com or call us today at 585-750-6757 or request a free estimate online and we will assess the best option to suit your specific roofing needs!