Wednesday, December 20th, 2017 by Jodi Eisenhour
Roofers will take an accurate roof measurement based on square footage and then divide this number by 100, giving them what is called a roofing square. One roofing square equals 100 square feet. Most roofing materials are sold by the square, not the square foot.
Roof Pitch or Slope
The roof's pitch is an important factor in determining roof cost for two reasons. First a very steep roof, typically recognized as anything that's more than a 6/12 pitch, is generally considered not walkable and requires greater staging, safety and labor to complete the roof.
Second, depending on the type of roof being installed and the required fire rating, roof pitch determines the type of required underlayment system and thus plays a very important role in pricing a roofing job properly. For example, a composition shingle roof that is between 2/12 and 4/12 pitch requires two layers of underlayment installed, while a flat roof that is between a 1/12 and 2/12 pitch may require certain underlayments to acheive a class A fire rating.
Type of Roof Being Removed and Number of Layers
For the most part, roof tear-offs are determined by the amount of tiume it takees to remove- the labor - and the dump charges to dispose of the roofing material, which is typically determined by the weight of the material. The heavier the material or the more there is, the longer it takes to remove the old roof and the morre it costs to dispose of properly.
Type of New Roofing Material
There are sizeable differences between types of roofing materials. The price of the roofing products plays a direct role in the aesthetic design, weight, durability and ultimate longevity of the new roofing system.
For sloped roofing products asphalt composition shingles tend to be your entry level product, with dimentional lifetime shingle product options demanding an increased price. Concrete and clay tile tend to be more of a mid-range option with synthetic, wood shake, metal roofing and traditional slate being in the higher range roofing products. For flat roofs, pricing options tend to start with coating, hot mop built-up roofs, modified torches, TPO products and finally single-ply PVC systems.
Roofing System Components Installed
Most people think of their new roof simply as the new tile or shingle being applied; however, there is much more to waterproofing your roof over the long-term. The type of underlayment and decking materials used, the ventilation and insulation installed and even the type of fasteners applied all carry a different level of performance, longevity, manufacturing cost, and thus price.
Contractor's Roof Access
Access to the roof is a critical aspect in the overall pricing of the job. Difficult access means additional equipment and labor are necessary to tear off the roof, load the roofing materials, stage the roof and complete the roof system. Since there is a direct correlation of labor and equipment costs to every roofing project, the easier the access, the less time and material are necessary to complete the job.
Type of Roof Warranty
There is a significant difference between a standard roofing warranty, where the roofing contractor is backing the labor and workmanship of the project, versus an extended or no-dollar-limit warranty backed by the manufacturer themselves.
Additional Roof Details
Finally, there are finish details and prep details that absolutely affect the cost of the roofing job. For instance, the type and quality of the lumber being used for fascia, rafters, along with the finishing sealants and counter-flashing details all play a critical role in not only the look of your finished roof, but the cost you will pay.