Bitumen Roof – Advantages and Disadvantages
One of the longer lasting roofing options for flat roofs is bitumen roofing or a modified bitumen roof. Modified bitumen is a type of asphalt product that can be applied in a number of ways to the roof in both hot and cold temperatures. Modified bitumen roofs have a lot of advantages over other types of membrane roofing, and are often seen as the modern alternative to the built up roof.
Bitumen Roof- Advantages
There are several different advantages to using a bitumen roof on your building or home. Unlike some newer types of roofing, it has a long, proven track record that can be counted on. Bitumen roofs are one of the longer lasting types of flat roofing materials, easily lasting 20 years or more.
Regardless of how the material is applied (self-adhesive sheets, hot-mopped asphalt, or cold-applied adhesives) the seams are usually melted together which help stop leaks. Other types of membrane roofing have seams that are left open or covered with another material that can weaken over time, so the fact that a bitumen roof can be seamless is a big advantage.
Bitumen roof is also very durable. They have a high-tensile strength so they are unlikely to develop the kinds of cracks that other flat and membrane roofs are known for. They are also rated against wind, fire, and hail so they are unlikely to be damaged in the event of a storm. Included in this is usually a very long manufacturer’s warranty that can help to guarantee the roof’s longevity.
Bitumen Roof- Disadvantages
Like all roof types, a bitumen roof does have some drawbacks. The first is their black color, which can absorb rather than reflect heat. And while the material itself may not be damaged by heat or UV rays, if proper insulation is not used with it, this absorption of heat can lead to superheating of the building below.
Bitumen roofing is also available in 1, 2, or 3-ply. The 1-ply material is not durable, and if used can pose certain problems such as breaking down prematurely, while the 2 and 3-ply material roofs cost significantly more to install, which can make this one of the most costly types of flat roofing products around.
Granules need to be included as part of the installation process to help protect the roof from the sun. If they are not included, this can further raise the temperature of the building or damage the roof. Unfortunately, not all types of bitumen roofs include granules as part of the installation process.
Finally, if your roof is likely to hold a lot of water or to gather puddles of standing water after rainstorms, this can prematurely age and damage the bitumen roof.
Durable When Done Right
The key to getting a successful bitumen roof job done is to make sure you are having it done correctly. This means using a 2 or 3-ply material and having it coated against UV exposure. When done right, a bitumen roof can far outlast the competition.
The two broad categories of asphalt roofing systems for commercial, industrial and institutional buildings are Built-Up Roofing (BUR) and Modified Bitumen Systems (MBS).
Built-Up Roofing: Built-up roofing systems have had a long-standing popularity, due in large part to the success and proven reliability of BUR. The stock of 20, 30 and 40-year-old BUR roofs still in excellent condition attests to this fact. Specifically, BUR roofs offer:
- Multi-Layer Protection -- the multiple layers of bitumen and bitumen saturated "felts" make a water-resistant barrier capable of providing many years of reliable protection from the elements
- Thermal Performance -- Built-up roofing systems exhibit exceptional resistance to the conduction of heat between the exterior and interior of a building, resulting in noticeable reductions in heating and cooling costs.
- Fire and Uplift Resistance -- Built-up roofing systems are tested through Underwriters Laboratories and FM Approvals to meet very strict fire resistance requirements and ensure adequate uplift resistance under extreme wind conditions.
- Economy -- Compared to other high performance commercial roofing systems, built-up roofing is one of the best investments on the market due to its competitive cost per year of expected service life.
Modified Bitumen Systems: Since gaining acceptance in the roofing industry during the 1970s, the use of modified bitumen membrane roofing systems has increased steadily. Today modified bitumen membranes are the fastest growing roofing materials in the industry.
Considered a quality “hybrid” system, MBS provides the features of a built-up roof with the added tensile strength and elongation of a modified bitumen cap sheet, as well as the quality assurance of in-plant membrane fabrication uniformity and control, and reduced labor requirements for installation.
TPO Roof System
- Great Value
- Excellent Seam Strength
- Long-term weathering
- Energy Saving
Everguard TPO60 mil membrane is suitable for all types of single-ply systems.
Mechanically attached application- for a quick and cost-effective system that can be installed practically year-round.
Rhinobond application- can be applied without using adhesives and installed practically year-round. Qualifies for the same guarantee length as an adhered system.
Adhered application- can be installed with Everguard 1121 Bonding adhesive (solvent based). Everguard low voc adhesive, or Everguard wb181 bonding adhesive (water based) for the smoothest appearance. Provides excellent wind uplift performance.
If you are looking for a cost-effective and durable single-ply roofing system for your flat or low-slope roof, a TPO (thermoplastic olefin) membrane may be a solid, cost-effective option.
TPO roofing systems are quickly growing in popularity and demand, in both residential and commercial flat roof markets. TPO can provide combined benefits of both, EPDM rubber and PVC roofs, but at a more economical cost than PVC.
While TPO membranes do offer an impressive number of performance, installation, and environmental advantages, because they are a fairly new product, there are some important considerations you need to be aware of before choosing to install a TPO roof on your home.
TPO in a Nutshell
A TPO roofing membrane is made from ethylene propylene rubber. Special technology is used to chemically bind together, rubber, ethylene ( an organic gaseous substance) and propylene (a byproduct of petroleum refining). At the end, numerous filler materials are added, such as talc, carbon filler and fiberglass. These fillers reinforce the TPO membrane’s strength and durability. A TPO roofing membrane has been specifically designed to have the advantages of a rubber roof, combined with hot – air weldable seams for extra durability. TPO roofing membranes have been manufactured in the US since the early 1990’s and are now the fastest growing segment of the US single-ply roofing industry.
A typical residential TPO roof will cost anywhere from $5.00 to $7.00 per sq. ft. installed. Thus, for an average sized 1,200 sq. ft. flat roof, your total average cost for a new TPO roof would range from $6,000 to $8,400.
TPO Roof Systems
Modified Bitumen Roof Systems
EPDM Rubber Roof Systems
Fiberglass Shingle Roof Systems
Metal Roof Systems
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