Roof Coverings

T here are many different types of roof coverings. Each one must be installed properly and has a design life expectance. Some roof coverings such has high grade slate or tile can last over 100 years! Other roof coverings such as asphalt rolled roofing last only 5-8 years. The various roof coverings are each prone to different types of problems. Usually the longer a roof covering is designed to last, the more expensive it is to repair or replace. Particular roof coverings are selected for a building based on the climate of the region, the cosmetic desire and the economic realities of matching the roof covering with the type of home. The roof surface is one of the most important components of the inspection. The protection of the inner building all starts at this point. The inspector will check the surface for any visible wear or damage. The inspector is also looking for improper installation and or alterations, which may be causing problems now or down the road. Besides end of normal life expectancy issues, bad installations are the most common reasons for roof failures. If a roof is installed improperly, repairs are usually only temporary and replacement is typically required.

Asphalt Shingle
Asphalt shingle roofs are the most popular roof material. They cover approximately 70-80 percent of all residential construction. Asphalt shingles are relatively inexpensive, easy to install and requires little maintenance than other more complicated roof coverings. The shingles come in a multitude of colors and designs and last from 15 to 30 years typically. Another advantage of asphalt shingles is normally a second layer that can be applied after the first has worn out. A common practice of installing a third layer to save expense by homeowners and roofers is often undertaken. This usually is a problem because it puts too much weight on the roof, shingles wear rapidly and the roof surface becomes uneven and is prone to wind damage. Asphalt shingles are sometimes improperly installed over old wood shingled roofs and sometimes even old slate roofs.

Slate Roof Covering
Slate roofing is typically considered a more expensive type of roofing material. The material itself costs more, it takes longer to install and some slates, being thicker, require a stronger supporting frame. If its well constructed, a slate roof has a normal life expectancy of more than 50 years. A slate roof is also fireproof and waterproof. Slate requires very little maintenance and never needs any kind of preservative. The inspector will check for proper installation and any signs of defect. If shingles need to be replaced, it is important to use a slate that is compatible with the original roof.

Wood Shingle Covering
The life expectancy of a wood shingle or shake is 25 to 30 years. Some can even last up to 50 years. They are more expensive that asphalt shingles, but they're popular because of their charming rustic appearance. It is recommended not to install untreated wood shingles and s hakes where heat and humidity are severe because they are quite susceptible to decay from moss, mildew and fungus. Treated shingles should also be installed on low-slope roofs as a low-slope will not shed water as well as roofs with a higher pitch. Treated shingles should also be used on roofs shadowed by overhanging trees as this condition would keep a roof wet longer.

Asphalt Rolled Roofing
Asphalt rolled roofing should only be used on flat or low sloped roofs. This material has a short life expectancy of about 10 years and requires ongoing maintenance. The seams should be inspected periodically and the roof surface is prone to damage from water ponding and ice in northern climates. Since it is primarily used on low slopes the roof material degrades quickly from ultraviolet exposure and wear from the direct nature of the elements. Besides wearing out quickly these roofs are often installed poorly because it is a very inexpensive installation. Careful attention must be paid to flat or low sloped roofs with asphalt rolled roofing.

Tile Roof Covering
A well constructed clay or concrete tile roof should last more than 50 years. This is also an expensive type of roof covering as the materials are more expensive and require a strong frame to support the heavy load of the tiles. Tile roofs require very little maintenance and no preservatives. The tile is fireproof so fire insurance costs less for the entire life of the building. Clay and concrete tiles have similar physical properties and installation methods. Concrete is cheaper to make than clay and it can be made anywhere. Clay tile must be made near a clay quarry, so freight cost to the building site is often higher than for concrete tile.