Flat roofing has a couple of different approaches. These approaches exist because flat roofing does not need the intense labor or structural integrity of sloped roofs. If you are having your flat roof on your building redone, here are the three options that are commonly offered, from least to most expensive.
Basic Flat Roofing
Basic flat roofing is the least expensive. It entails laying down some plywood for insulation followed by a layer of rubber roofing. The rubber roofing prevents leaks, and does the most basic job of keeping your flat roof safe and dry. If you also have downed power lines on your roof at any time, the rubber roofing prevents accidental electrocution if you are stepping onto or standing on the rubber.
Intermediate Flat Roofing
Intermediate takes basic flat roofing up a notch. Usually the rubber layer is covered with small-sized aggregate. The aggregate may then be left to itself, or an application of a bonding agent may be applied over the aggregate to solidify the little stones together in one large mass over the basic rubber roofing. The purpose of the latter is to deter heavy rains from seeping through unbonded aggregate to the rubber roofing layer below. In places where rain is really heavy, this is a very useful technique. The aggregate layer or bonded aggregate layer add to the price of the basic rubber roofing by a few thousand dollars.
Advanced, or Fool-Proof Flat Roofing
The most expensive, but also most fool-proof flat roofing involves a layer of asphalt. Covering the entire flat roof of asphalt turns the roof into a tough barrier through which heat and cold cannot penetrate. It is your building's insulative layer during all kinds of weather, much in the same way that an attic with asphalt shingles on the roof keep a house dry, warm or cool. The asphalt goes over the rubber and aggregate layers of flat roofing. It is smoothed flat, and makes for a very nice place to sit on hot nights or go on breaks from work (depending on what is happening in your building--residential or business).
Because the asphalt roof here involves the other layers of roofing material, the total cost will include the prices of the other materials as well as the cost of the asphalt. You should also keep in mind that particularly heavy construction equipment has to get to the roof, which is a big part of the expense for this type of roofing. Still, the benefits of asphalt on a flat roof are worth it. To learn more about your options, contact companies like Fischer Roofing - Flat Roof Pros.