Replacing a roof can be one of the most expensive home or building maintenance tasks. Probably major tuckpointing and replacing siding are the only maintenance items that are consistently more expensive. Although we can’t make our roof last forever, there are some maintenance practices we can do that will dramatically extend the life of our roof. The ideas below came from a conversation I had with the retired roofer who put the roof on my porch (I replaced the old porch last year). He was amazed at how few people undertook the inexpensive maintenance efforts and, instead, just let their roof deteriorate.
If you are fortunate enough to have a metal roof then your roof is going to last many many years with minimal maintenance. This type of roof is expensive at first, then nearly maintenance-free for the next 50-100 years.
If you have a shingle roof then the primary maintenance is to assure that trees are not rubbing against the roof (and damaging the shingles by abrasion) and that trees are not preventing the shingles from drying after it rains or snows. Continuous exposure to moisture is damaging to shingle roof material.
When you need to have your shingle roof replaced, be sure to have the roofer use 50+ year shingles. There is only a small price difference between the cheapest and the best shingles. This is because most of the cost of reroofing is labor (and insurance for the workers since there is such a high injury rate among roofers). Using the best shingles also makes your roof more resistant to wind damage since these shingles are rated to withstand much higher windspeeds without blowing off. The better shingles also have a more three dimensional appearance — they look more appealing.
Most multi-family buildings, including condos, have flat or slightly sloping roofs. These roofs are most often a made of a rubberized asphalt material. It is attached to the plywood or other substrate by heating it (which melts the backing somewhat and making it glue itself to the material below) and overlapping it. This “torch-down” roofing material is black, so it absorbs and holds tremendous heat in the summer. Heat eventually breaks down the roofing material causing the roof to fail. Some newer buildings have a roofing surface made from a synthetic material. These tend to last much longer and require less maintenance. This roofing material has not come into widespread use at this time.
If you have a flat roof or a slightly sloped roof then it is important to prevent buildup of organic material, such as leaves and branches, in order to prevent moisture from remaining of the roof. Moisture breaks down this type of roofing material in much the same way as it does on shingled roofs.
A very important maintenance activity for flat or sloping roofs is coating the roof with a weather resistant material. These coatings reduce heat build-up — they are usually light-colored — and they prevent degradation of the rubberized asphalt material by placing a protective film between the roofing material and the elements. They protect the roofing material in much the same way that paint protects wood.
The roofer I spoke to told me that cleaning and coating the roof with a high-quality protective material will extend the life of the roof up to 30 years or more. These high quality coatings are available at all roofing supply houses as well as hardware stores such as Clark-Devon Hardware.
Since the injury rate on roof work is very high, especially for inexperienced homeowners, it is best to hire someone to maintain your roof. Make sure all contractors you hire to work on your roof (or any other area of your home) have worker’s compensation coverage for their employees and subcontractors. Most homeowner’s insurance policies exclude protection for the homeowner for injuries sustained by individuals doing work on our homes.