Posts Tagged ‘flat roof repair’

Commercial and Industrial Flat Roof Systems

January 4, 2011

Commercial Flat Roof Systems

It is important that customers are educated on their roofing needs as the investment in commercial flat roofing systems are significant. Here is some information from the National Roofing Contractors Association on the most common flat roofing systems for industrial & commercial buildings to help you make your decision.

Built Up Roofing System

Built Up Roofing – BUR

These roof systems are sometimes referred to as “tar and gravel roofs” (although we don’t use actually use tar as it’s a carcinogenic) and asphalt BUR is the most common type of flat roof at this time.

BUR systems generally are composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane.  The number of plies in a cross section is the number of plies on a roof: The term “four plies” denotes a four ply roof membrane construction.  Sometimes, a base sheet, used as the bottom most ply, is mechanically fastened.  Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.  The reinforcing fabrics also are called roofing felts or ply sheets.

The bitumen typically used in BUR roof systems is asphalt, coal tar or cold-applied adhesive.  The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or mechanical spreader.  Asphalt is a petroleum product refined from crude oil; coal tar is derived from the distillation of coal.  Cold-applied adhesives typically are solvent-based asphalts that don’t have to be heated in a kettle or tanker.

The materials used for built up roof systems include aggregate (such as gravel, slag or mineral granules), glass-fibre or mineral surfaced cap sheets, hot asphalt mopped over the entire surface, aluminum coatings or elastomeric coatings.  Asphalt BUR is the most common type of flat roof at this time. It is made up of multiple layers of reinforcing plies and asphalt forming a redundancy of water proofing layers.  The reflectivity of built up roofs depend on the surfacing material used.  Gravel is the most common and they are referred to as asphalt and gravel roofs. Asphalt degradation, however, is a growing concern. UV-rays oxidize the surface of the asphalt and produces a chalk-like residue.  As plasticizers leach out of the asphalt, asphalt built up roofs become brittle.  Cracking and alligatoring follows, allowing water to penetrate the system causing blisters, cracks and leaks.  Regular maintenance is required to ensure that a BUR roofing system achieves its life expectancy.

SBS (APP) Roofing System

Single-Ply Membranes

Single-ply membranes are factory-manufactured sheet membranes. They generally are categorized as either thermoset (EDPM) or thermoplastic (TPO or PVC). Thermoplastic materials can be repeatedly softened when heated and hardened when cooled. Thermoset materials solidify, or “set,” irreversibly after heating. Single ply membranes commonly are referred to by their chemical acronyms, such as ethylene propylene diene monomer (EPDM).

Single-ply sheet membranes are produced using one of three manufacturing processes: calendering, extruding or spread coating. The membranes may contain reinforcement layers. Common reinforcements for single ply membranes include polyester fabrics or scrims, glass fibre, or a felt or fleece backing.

A finished sheet’s thickness typically is referred to as mil thickness. Common mil thickness for these sheet membranes range from 30 mils to 60 mils. Single-ply membranes can be installed fully adhered, mechanically attached or held down with ballast. Most single-ply roof systems do not receive surfacing. In many instances, a combination of attachment methods are used to secure a roof system.

For instance, an insulation may be mechanically attached to the substrate with the roof membrane fully adhered to the insulation.

EPDM Roofing System

EPDM A Single-Ply Membrane

Ethylene Propylene Diene Monomer (EDPM) roofing is an efficient rubber roof style used on low-slope roofing surfaces. It is a synthetic rubber most commonly used in single-ply roofing because it is readily available and relatively simple to apply. It is also called Single Ply Membrane and it is one of the common types of low-slope roofing. It’s been in use on roofs in the Canada since the 1960’s. When properly applied, it has a life cycle of 15 to 25 years. It is great for preventing leaks and is often installed for roofs that have problems with weathering, failing joints, and inflexibility. It is relatively inexpensive as well as simple to install as compared to BUR. Compared to conventional built-up roofs, it is also much cleaner and doesn’t emit the odors and fumes that are often associated with built up roofing systems. (Although Conestoga Roofing uses an “odourless kettle” when it comes to applying BUR.) Vulcanized EPDM is the most common type of EPDM roofing system. Non-vulcanized EPDM is typically used for flashing purposes.

There are three methods of applying EPDM:

  1. Fully adhered EPDM uses water-based or solvent-based adhesives to adhere the EPDM rubber to the substrate.
  2. Mechanically fastened EPDM is attached to the substrate by manufacturer-approved mechanical methodology.
  3. Loose-laid membranes are secured only at the perimeters and any penetrations. A ballast of round river rock or concrete pavers is used to hold the materials in place. The river rock is usually installed at a rate of 1000 – 1200 pounds per square (100 square feet of roofing surface) and the pavers typically weigh 20-pounds per square foot. Structural integrity is of paramount importance with a loose-laid roof system. The seams are sealed using either an adhesive or a splicing tape.

EPDM Benefits:

Highly dependable, economically beneficial, high durability, and high efficiency makes EPDM an attractive option to any building owner looking to a commercial, industrial and institutional roofing contractor for a new roof or an upgrade to the existing roofing system. Additionally, an EPDM roof will often come with long warranty, low maintenance requirements, low installation labor costs, and generally garner rather easy code approvals. For regions subject to potentially catastrophic weather experiences, such as hurricanes – EPDM roofs have very high resistance, making them quite practical for those who live in those areas.

Advantages of EPDM

EPDM roofs are highly resistant to weathering, ozone, and surface damage. It is flexible in cold weather and still has high fire and heat resistance. You can’t go wrong choosing EPDM for low-slope roofs and flat roofs that need to be waterproof and durable against the harsh Minnesota weather.

TPO Roof System

TPO & PVC

Another example of a Single-Ply Membrane is the thermoplastic TPO or PVC roofing system. These membranes can be repeatedly softened by heating or hardened when cooled. Because of the materials’ chemical nature, thermoplastic membranes typically are seamed by heat welding with hot air or solvent welding.
The most common thermoplastic roof membranes are PVC and TPO. The following provides general descriptions of these two systems .

Thermoplastic Olefin (TPO)
TPO membranes are produced by calendering with lamination, extrusion with lamination, or extrusion-coating techniques. TPO sheets are a blend of polypropylene and ethylene propylene polymers and usually are reinforced with polyester. TPO sheets contain colorant, flame retardants, UV absorbers and other proprietary substances to achieve desired physical properties.

  • Sheet widths range from 6 feet to 12 feet wide
  • Sheets are typically 40 mils to 100 mils thick
  • Seams are sealed by heat welded with hot air
  • TPO membranes Commonly are white or black
TPO roofing

PVC sheets are produced by calendering, spread coating or extruding, and typically are reinforced with polyester or glass-fibre mats or scrim. PVC sheets contain plasticizers and stabilizers, as well as other additives to impart flexibility and achieve other desired physical properties. Some membranes are available with nonwoven fleece backing adhered to the underside of a sheet.

  • Sheet widths range from 6 feet to 12 feet wide.
  • Sheets are typically 45 mils to 90 mils thick.
  • Seams are sealed by heat or chemical welding.
  • PVC membranes are produced in numerous colors, though gray and white are the most common.

Modified Bitumen

Polymer-modified roof membranes are composed of reinforcing fabrics that serve as carriers for the hot polymer-modified bitumen as it is manufactured into a roll material. MB roof system membranes are composed of multiple layers, much like BUR membranes. MB roof systems typically are installed as a two-ply system and almost always are fully adhered.

There are two types of MB roofing membranes:

  • SBS polymer-modified bitumen membranes commonly are installed in hot moppings of asphalt (similar to BUR systems) or cold adhesive. Some SBS modified membranes are self adhering; that is, they contain an adhesive backing.
  • APP polymer-modified bitumen membranes typically are heat-welded or torch-applied.

Generally, APP modifiers impart a “plasticized” quality to asphalt, and SBS modifiers impart a “rubberized” quality to asphalt. MB membranes and EPDM a thermoset membrane, often are confused by consumers because of colloquialisms used by roofing contractors. MB and EPDM membranes are sometimes called “rubber roofs.”

Modified Bitumen

Surfacings for MB membranes include aggregate surfacing, mineral surfacing, metal foil-laminate surfacing and smooth liquid-applied surfacing.

Look for a roofing contractor that specializes in different types of roofing, and can help you to decide which will work best for your building – residential or commercial.

If you are planning to install a flat roof for your building, the best thing that you can do is to contact a professional roofing service that has extensive experience working with commercial roofing systems.

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Maintaining A Flat Roof

December 30, 2010

Flat Roof Maintenance

There is no perfect roof, but for some reason flat roofs never seem to get any respect!  The sloped roof is far and away the choice for residential construction, and more and more builders are putting them on commercial and industrial buildings as well.

Advantages Of A Flat Roof

The flat roof has many advantages and offers unique options that are too often overlooked and underrated.  For instance:

  • A flat roof is considerably cheaper to build than a sloped roof.  They can be built quicker saving money on labor, and they have less surface area requiring less expense for materials.
  • They are more easily accessible and far less dangerous than sloped roofs.
  • They offer more uses than just keeping the elements out (i.e. a flat roof can be used for storage or as a roof top garden and terrace.
  • Compared to a sloped roof, a flat roof provides you maximum functional cubic volume for your construction dollar.

Care & Maintenance Of A Flat Roof

Assuming a flat roof is constructed of high quality materials and skillfully installed (especially at the edges), the key to avoiding problems is regular inspection and maintenance.

  • Inspect your flat roof seasonally and even more often if you have trees nearby that can drop leaves and debris which clog drains and create water puddles.
  • Drainage is vital!  Always make certain drains are clear.
  • After heavy snow or a freeze-thaw cycle look for, and break up, ice dams which cause water build up.
  • Look for signs of “ponding” after rain.  “Ponding” means a low area must be built up with rigid insultation and resurface to ensure proper water flow.
  • Blistering or mushy areas mean that water has gotten between roofing layers.  These areas need to be cut out and replaced.
  • When the surface looks cracked or “alligatored” consider a new fresh application of roofing tar.
  • To extend the life of a flat roof consider applying reflective aluminum paint.  It will prevent ultraviolet light from breaking down the roofing material and keep the building cooler.
  • Make certain edges are sealed and all flashing is in good repair.

Flat roofs have many advantages and offer unique architectural and living options.  They can serve you faithfully for many years, but the key is regular inspection and simple maintenance when required.

Most important of all is that a flat roof must be designed and installed by a professional roofing company with the expertise, skill, equipment and materials to do it right.

What Are The Major Types of Single-Ply Roofing Systems For Commercial Properties?

March 18, 2010

TPO, EPDM, and PVC Are The Three Major Types of Single-Ply Membranes

Single-Ply membranes have been around for over 20 years.  The biggest advantages to these single-ply roofing systems are is that they are light weight per square foot.  This makes them an ideal choice for retro-fitting over an existing roof system.  This allows for quicker installation, less disruptions to the building owner, and most importantly, cost savings.  Many single-ply membranes are white and provide superior reflectivity, which in turn helps to reduce A/C costs during summer months.  These roof coatings are very versatile and can be applied on a large variety of roof systems.  Extremely durable & easily installed by authorized contractors without disruption to daily operations, the roofing system is also leak-proof, energy-efficient, chemical & fire resistant, resistant to high winds, & virtually maintenance-free.

The importance of roof coatings cannot be ignored if you want to avoid the complications of roof repair.  Select only quality products for roof repairing will assure you of the best results and minimize future repair costs to your property. 

Commercial roofing systems have improved in durability and longevity through years of trial and error from almost every major manufacturer in the industry.  Thanks to their efforts, the leading commercial roofing manufacturers are producing better products, even for old concepts.  That’s why flat roof systems are being used on everything from laundry mats to shopping malls and banks.  The biggest concern for architects and commercial builders is selecting the right system and finding a qualified roofing contractor to install it properly.

SEE ALSO:
EPDM Single – Ply Roofing System
PVC Single – Ply Roofing System
TPO Single – Ply Roofing System

Twin Cities Commercial Flat Roofing Contractor

January 12, 2010

United Roofing & Remodeling Commercial Roofing
United Roofing & Remodeling is the leading commercial roofing contractor for high-performance roofing systems for commercial and industrial properties in the Twin Cities. We offer our customers the industry’s most comprehensive customer support, installation and repair services.  We have also earned the distinguished designation of Master from GAF for installation of commercial Thermoplastic Roofing Systems. We provide Built-Up and Single-Ply systems.

    We specialize in Commercial Flat Roofing:

  • Built Up Roofing
  • EPDM Single-Ply Roofing
  • TPO Single-Ply Roofing
  • PVC Single-Ply Roofing

Because of our Master status, we can offer our customers extended warranty programs that other Twin Cities roofing contractors cannot.  Some warranties will last as long as 20 years.  Our 20 plus years of experience maintaining, repairing and installing commercial roofing systems is one of the many reasons we are routinely judged to be among the very best roofing companies serving the Twin Cites and surrounding areas of; St. Louis Park, Edina, Minnetonka, Bloomington, Plymouth, Excelsior, Wayzata, Eden Prairie, Chanhassen and Chaska.

United Roofing & Remodeling works to provide all of our crews with in-house safety and skills training.  We provide ongoing support so we can hire and retain the best roofing contractors. It gives our clients the confidence that they are receiving the best materials installed by most qualified roofers.

Our expert sales staff will work closely with you to custom tailor a job to fit your needs.  Whether maintaining a specific budget, acquiring a desired warranty, saving energy or developing a tapered insulation system, we have the solutions and capabilities to solve your commercial roofing problems.  We have over 20 years of experience in commercial roofing working with apartment, condo & townhome associations, industrial sites, institutions, restaurants, law offices and churches.

Our experienced staff, along with technologies such as infrared moisture scans and professional estimating programs, will help ensure that the proper roof system is produced.  The key elements of our success are quality installation, superior communication and competitive pricing.  We are fully licensed and insured and offer free estimates with no obligation.

Need emergency roofing service?  Simply call us at our office number (612) 617-1717
Or Request a Quote online

Storm Damage and Restoration Services From A Minnesota Roofing Contractor

October 29, 2009

Regular Roof Inspections Can Save You Money In Costly Repairs

Numerous homes are damaged by hail and wind every year.  Also, many homeowners are unaware of damage to their property.  This damage might reduce the value of their homes.  For example, a roof damaged by hail can result in interior leaks that you may not even know about until it is too late.

If you are like most homeowners, the thought of going through the process of working with an insurance adjuster, and then finding a contractor to repair the damage can be overwhelming.  From a general lack of knowledge about how to file a claim, to which materials are best suited for your needs, many homeowners fail to receive the benefits they have coming to them.

United Roofing will provide you with a free home inspection, and if you have storm damage, we will assist you with your insurance claim ~ from start to finish.

We will manage the entire insurance process for you.  We are experts because we do it for our clients every day.  It allows us to keep your job moving quickly, while taking the burden off you.

Contact United Roofing & Remodeling today to schedule your next roofing inspection at 612-617-1717
Or Request a Quote online

Free Property Inspection

Commercial Flat Roof Repair

September 17, 2009

Single-Ply Membrane Roofing Installation And Repair Services In Minnesota

TPO, EPDM, and PVC are the three major types of Single-Ply membranes

Single-Ply membranes have been around for over 20 years.  The biggest advantages to these single-ply systems are is that they are light weight per square foot.  This makes them an ideal choice for retro-fitting over an existing roof system.  This allows for quicker installation, less disruptions to the building owner, and most importantly, cost savings.  Many single-ply membranes are white and provide superior reflectivity, which in turn helps to reduce A/C costs during summer months.  These roof coatings are very versatile and can be applied on a large variety of roof systems.  Extremely durable & easily installed by authorized contractors without disruption to daily operations, the roofing system is also leak-proof, energy-efficient, chemical & fire resistant, resistant to high winds, & virtually maintenance-free.

The importance of roof coatings cannot be ignored if you want to avoid the complications of roof repair.  Select only quality products for roof repairing will assure you of the best results and minimize future repair costs to your property.

Contact United Roofing & Remodeling Inc today for any commercial roofing installation or repair services you may need.  Visit us at www.unitedroofingmn.com for more information about our other commercial roofing services.  612-617-1717
SEE ALSO:
EPDM Single – Ply Roofing System
PVC Single – Ply Roofing System
TPO Single – Ply Roofing System

Hail Damage In Minnesota To Built up Roofing

September 15, 2009

Commercial Built Up “BUR SYSTEMS” Roofing Systems

Hail Damage In Minnesota To Built up Roofing

Commercial Built Up “BUR, Roofing Systems comprise a large percentage of the commercial roofs today.  The hail resistance of these roofs is known to be quite substantial.  However, one of the most vulnerable spots on any building is the roof.

One hazard most building owners can expect to face at some time is hail damage.  As we all know, hail can hammer the Midwest, and when it does, the potential for damage is high.  Hailstorms can shatter windows, damage a buildings exterior, and destroy or damage the roof.  One bad hailstorm is all it takes to cause severe damage and expose the weaknesses in your built up roofing.

At United Roofing & Remodeling, we have been installing and repairing commercial built up roofing “BUR” systems”, for over 20 years.  United Roofing & Remodeling can provide all your commercial roofing needs.  We are a GAF Master commercial roofing contractor, are certified with Versico, and install Johns Manville products.  We hope you will consider United Roofing & Remodeling for your next project-and see what 20 years of experience and dedication have to offer.

Contact United Roofing & Remodeling today to learn how we can help you!  We are fully licensed and insured and offer free estimates with no obligation.  612-617-1717