In some areas of the country, a leaky roof might require little more than a well-placed bucket once every few months (Southern California, we're looking at you). In Philadelphia, roof repair is a very real, very important issue for every household. Far from a simple wet spot on the floor, a poorly functioning roof in Pennsylvania can lead to huge problems down the line if it is not dealt with.
Situations Requiring Roof Repair in Philadelphia
Basically, any properties in the northeast where a problem can be seen with the naked eye will most likely need to be remedied ASAP. Water marks on the ceiling should always be investigated; a roof that is blatantly leaking should be attended to immediately. The reason why Philadelphia roof repair (as well as the repair of roofs in other northeastern areas) is so important has to do with both the stability of the structure and the possibility of dangerous mold growth, as well.
With the presence of large amounts of moisture many times a year, Philadelphia roof repairs need to be done quickly to decrease the likelihood of further property damage. The longer the wood in your home is exposed to excess moisture, the weaker the wood will become. If what seems to be a small problem is ignored, whole sections of the roof may be damaged enough to require replacement. All that moisture is also a breeding ground for mildew and mold that can affect the health of the people living in the house. While the air in other parts of the country may be dry enough to retard some fungal growth, these are definitely not the circumstances in Philadelphia.
Preventing Roof Problems
Lack of maintenance is considered the biggest cause of roof problems. Most Philadelphia roof repairs, and indeed most roof repairs in the country, have to deal with mending a problem that, if caught early on, would require very little money, time, and labor to fix. Making sure that a roof is thoroughly inspected before buying a home is an excellent choice; having a roof inspected periodically while you're living under it is just as important.
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Roof Repair Roof Repair Pricing
The bottom line prices for roof replacement in Philadelphia will vary tremendously depending on the kind of property you live in. It is likely that completely replacing a roof will be much less expensive in the city than in areas surrounding it because there is simply less roof to deal with. Prices in outlying areas can run as high as $12,000 for regular asphalt roof repair; Philadelphia's more central properties can dip as low as $3,500 for a similar job because the floor space is contained in more stories, rather than spread out horizontally.
Roof repairs can cost between $400 and $2,000, depending on what needs to be done and how much of the roof is affected. Your best bet to keep your bill as low as possible is to get your roof inspected regularly, so $2,000 worth of major repairs doesn't spring out of a $400 repair that could've been done in an afternoon.
Roofing materials other than asphalt shingles (metal, tile, slate, etc.) are more expensive to install, and, in many cases, to repair, as well. These materials, however, show their benefits over the long haul. Many metal roofs have lasted well over 50 years, and a slate roof (though too brittle to walk on) can last over 100. When compared to the life expectancy of many asphalt products (25 years or less in some cases), alternate roofing materials might just be worth some looking into. 
Jon Nunan is a freelance writer who draws on his experience in construction, ranging from landscaping to log home building, for his articles on home improvement.