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Roof Inspection Defects - Quality Home Inspections of East Tennessee

Here are a few defects that I as a home inspector look for during a roof inspection. The general age and condition of your roofing shingles are going to be part of the home inspection. Typically, asphalt shingles have a life expectancy up to 20 years.

Architectural asphalt shingles can have a life expectancy up to 30 years. Of course, extreme weather conditions, moss, and trees that are too close can shorten these life expectancies. Metal roofs can have life expectancies ranging from 40-80 years, but keep in mind roofs of all types occasionally need maintenance. For asphalt shingled roofing, nail pops are one of the issues that stand out to an inspector.

Nail pops is a nail that hasnít been fully driven down. With this condition, you will notice that shingles do not lay flat. You Ďll see one side or the other sticking up slightly. This condition can create an opportunity for water to enter into the roofing system. Moss growing out of the shingles is an obvious defect.   Moss

Moss holds moisture down on to the shingles, which can cause shorten their life expectancy, and, over time, its presence can create points of water penetration through the roof. Ridding your roof top of moss growth should be part of your regular roof maintenance along with making sure your gutters are cleaned out.  

How do I keep moss off my roof?

Of course, you want to have any missing shingles replaced.

 On metal roofs it is important to look at the screws. Are they too loose or too tight. If they are too loose that could allow water to get in, or worse make the roof less structurally sound in the event of a wind storm.  

Metal roof screw

If screws are too tight youíll see the washer is pushed outwards. This can also cause a roof leak.

For roofs in general keep an eye out on satellite dish connections.  You could have a leak in your attic and not know it, simply because  fasteners on your  satellite dish were not properly installed. Itís best to avoid installing a satellite dish on your roof to start with, but if you have one already it is a good idea to monitor your roof in that area closely. The screws should be sealed with a roof patch tar or a material specifically designed for sealing to asphalt. Besides screws leaking, satellite dishes tend to create a barrier to water, preventing it from running straight down and off your roof as quickly as it normally would. Water can pool up at the base of a dish and this can lead to a roof leak eventually.  

satellite base on roof

East Tennessee Quality Home Inspections
Quality Home Inspections serves the East Tennessee area of Roane, Loudon, Knox, Anderson, and Cumberland counties which includes the cities of Knoxville, Oak Ridge, Kingston, Harriman, Rockwood, Oliver Springs, Midtown, Lenoir City, and Crossville, Tennessee. The goal of Quality Home Inspections is to help make the home buying decision a little less complex by providing a professional visual inspection and report of various systems and areas of the home.

If you have questions regarding our home inspection services in East Tennessee feel free to call me at any time during the day at  

or email me at