A good roofing system incorporates a series of components that work together to protect the home. The shingles are just what you see. Underneath the shingles and at critical areas on the roof different parts of the system combat the many different ways that water can eventually leak into your home.

Components Of A Roofing System

A closer look at this residential roof reveals the critical areas that need extra protection

Roofing System Basics

1. The Roof Ridge Ridge vent on a roof
What Is It? … An intersection of two roof planes forming a horizontal peak.
What Component Does It Require? … A roof ridge shingle that is applied along all roof peaks to allow proper outflow of air from the attic.
2. The Roof Deck roofing system 2
What Is It? … The structural base for the roof, usually made of wood or plywood.
What Component Does It Require? … Most roof decks will have plywood at least 3/8-inch thick. The spacing of the rafters and the pitch of the roof are a factor in the thickness of the plywood required. 3/8″-thick plywood works well with rafters that are 16″ apart with minimal roof loads. The load of the roof varies depending on the pitch of the roof. The flatter the roof, the greater the roof load. Rafters spaced 20″ or more apart require 1/2″ or 5/8″ thick plywood decking. 24″-spaced rafters should have no less than 5/8-inch plywood.
3. Underlayment roofing system 3
What Is It? … A layer of protective material between the deck and the shingles.
Why Is It Necesssary? … The underlayment serves as an extra protective barrier between the roofing shingles and the plywood decking.
4. The Eaves roofing system 4
What Are They? … The lower border of the roof that overhangs the wall.
Why Is It Required? … Insures that rainwater falling on the roof is directed into the gutters and away from the house.
5. Ice and Water Barrier
What Is It? … A self-adhesive waterproofing membrane used along eaves and valleys.
What Does It Do? … Protects areas prone to water leakage against water infiltration from ice damming and wind-driven rain.
6. Metal Drip Edge
What Is It? … A narrow strip of noncorrosive metal used at the rake edge.
What Component Does It Require? … Facilitates water runoff.
7. Flashingroofing system 7
What Is It? … Metal strips applied with waterproofing membrane at junctions of different planes or around protruding surfaces such as chimneys, skylights, and vents.
Why is it necessary? … Provides extra protection at these critical areas where shingles do not extend.
8. The Hip roofing system 8
What Is It? … The intersection of two roof planes that meet to form a sloping ridge running from the peak to the eave.
What Component Does It Require? … Hip ridge shingles that are applied along the hip to create a water-tight seal at the junction.
9. Valleyroofing system 9
What Is It? … The intersection of two sloping roofs joining at an angle to provide water runoff.
What Component Does It Require? … An Ice And Water Shield applied over the underlayment and underneath the shingles to prevent water infiltration due to shingle failure, ice damming and wind-driven rain
10. Undereave Ventroofing system 10
What Are They? … Intake vents located under the eaves of the roof that help draw cool dry air into the attic.
Why Are They Necessary? … Adequate air flow through the attic is critical to remove moisture build up that can ruin insulation and damage the wood framework. Air flows in through the eave vents and upward and out through the ridge or roof vents. Eave vents should always be kept clear inside the attic to allow proper air flow.

Davis Roofing and Construction, Inc. provides free estimates and answers to your roofing questions in the Chicago Area of Illinois. Call 888-761-3881 to speak with an expert about your roofing needs! Or, leave us a message on our contact page after hours and we’ll call you back as soon as we can.

For more information about roofing your residential home, visit another article about what you need to know when re-roofing your home.

Learn more about Owens Corning™ Roofing products that make up the Total Protection Roofing System visit the Owens Corning Website at www.OwensCorning.com