If your roof has chimneys, dormers, and walls, then you will see flashing on your estimate. Flashing prevents water from seeping behind and under shingles, causing water damage to the structure.
Most roof replacement estimates will mention warranties and guarantees with limitations and for a specific number of years.
If the home has a chimney, a professional roofing contractor may recommend installing a cricket if there isn't one already. A cricket is a peaked construction at the back of a chimney to help prevent snow and ice build up and to deflect water around the chimney.
All roofs need to be vented to allow moisture to escape and prevent damage to the roof and the entire home. There are several types of roof ventilation systems. The most popular are ridge vents. They are installed along the ridge or peak of the roof and allow hot air to escape and draw cool air in the soffit vents.
A valley is the angle formed by the intersection of two sloping roof planes to provide water runoff. Because of the amount of water passing through that area of a roof, it is important to consider how the area will protected when replacing an asphalt shingle roof.
The purpose of a roof is to protect the home from the elements; wind, rain, ice, etc. In most climates, ice and/or water are a concern you can't ignore.
I have been providing professional roofing & siding craftsmanship in the Pittsburgh area since 1991. Quality and attention to detail is top priority.