Everyone knows what a roof is!  In case you do not, Webster’s dictionary states “a roof is a covering on the uppermost part of a building or shelter and the framing or structure which supports the covering.”  This is what you thought, right, simple.   Not so simple.

The characteristics of a roof are dependent upon:

  • the purpose of the building or structure it covers i.e. family home or business
  • the available roofing materials
  • the local traditions of construction and concepts of architectural design and practice where you live or do business
  • and, maybe rules and regulations governed by local or national legislation

Roofs mostly protect the building or structure from animals such as birds and their nests and weather,


  • Rain, Snow and Ice (i.e. water and moisture)
  • Heat
  • Wind
  • Sunlight

The elements in the design of a roof are the material, the construction and the durability.


The material of a roof may range from asphalt, metal, rubber, tile or maybe even thatch, a plant based material.  The material used largely depends on the building, climate of its location and general architectural design and purpose.

Because the main purpose of a roof is to protect people and their possessions from climatic elements, the insulating properties of a roof are a consideration in the choice of roofing material.  Forms of insulation are felt or plastic sheeting, sometimes with a reflective surface, installed directly below the top surface (i.e. shingles, tiles …).  So called Cool roofs are becoming popular, and in some cases mandated by local codes.  Cool roofs are defined as roofs with both high reflectivity and high thermal emittance.

Poorly insulated and ventilated roofs can suffer from problems such as the formation of ice dams in cold weather.  Ice dams occur when heat escapes from the upper most part of a roof causing melting.  The melted snow drips and refreezes along the shingles and collects in the form of ice at lower points.  This not only compromises the roof but often causes structural damage due to stress from the weight of the ice dams as well as the destruction of gutter and drainage system.

Areas prone to heavy snow benefit from a metal roof because their smooth surfaces shed the weight of snow more easily and resist the force of wind better than a wood shingle or a concrete tile roof.  Newer roofing systems include solar shingles which generate electricity as well as cover the roof.  There are also solar systems available that generate hot water or hot air, i.e. thermal energy, which can also act as a roof covering.


The construction of a roof is determined by its method of support and how the underneath space is bridged and whether or not the roof is pitched.  The pitch is the angle at which the roof rises from its lowest to highest point.  Most residential buildings are sloped or pitched.  The usage of drainpipes in commercial and industrial buildings has replaced the need for pitched roofs with flat roofs.

The durability of a roof is a matter of concern because the roof is often the least accessible part of a building for purposes of repair and renewal while its damage or destruction can have serious effects.

Affordable Roofing

GAF and CertainTeed are North America’s two largest manufacturers of commercial and residential roofing materials.   They provide advanced roofing materials to contractors they certify based on strict industry guidelines.  These companies have been in business themselves since 1886 and 1904 respectively.  A2Roofing, located in Ann Arbor, Michigan, is both GAF and CertainTeed certified as a roofing contractor.  This means, A2Roofing has access to and utilizes nothing but the highest quality products at affordable prices.  We at A2Roofing pass this value on to you as our valued and respected customer.

Both GAF and CertainTeed have vast amounts of roofing products to choose from.  Our A2Roofing Professionals are all well versed in helping you choose what you not only need but what may be the best for you in your home or business based on weather conditions and architectural design of homes and business in Ann Arbor, Michigan.  We are also available to service residents and businesses in other neighboring communities.  No job is too big or small.

Call 734-548-9915 for emergency, year-round service, 24/7 or visit our website at for all your roofing needs.