Steel Building Roof Systems
Throughout history man has had to satisfy the basic need of a “roof over his head” to shelter himself, his family, and his possessions from cold, heat, rain, and snow. At first, this protection from the elements was very simple, even crude in form; but as man became more and more civilized he demanded better and more elaborate protection. Through succeeding centuries he learned many things about shielding himself from the elements. Through trial and error, he has sorted through a multitude of different materials, trying to find the ideal combination for roofing materials that were strong, but not too heavy, and materials that were long-lasting and resistant to weathering, and materials that would not leak, blow away, or fall apart.
Today, we see many kinds of roofs and roofing materials: wood shingle, plastic or composition shingles, tar paper, tile, slate, built-up roofs, and various kinds of metal roofs. For our purposes we need only study the types most frequently used for nonresidential use: Metal Roofs, Built-Up Roofs, and Single-Ply Roofs.
Even though we have frequently pointed to metal buildings as the “modern way to build,” it is interesting to observe that metals have long been recognized as the best roofing materials.
In order to obtain the many advantages offered by metal at a reasonable price, today’s building owner can now turn to roof panels made of either aluminum, aluminum-zinc alloy coated steel, or aluminum clad steel; all of which are available at relatively economical prices.
Originally, metal sheets used for roofing were flat and it was necessary to join them by either welding or soldering, or to introduce lap seams and joints. To facilitate this type of installation, it became a common practice to crimp or flange the edges of the panels. Later, in order to provide panels with greater strength, the metal sheet was formed so as to have ribs or corrugations.
The illustration below represents an early application of this principle of the continuous corrugated panel. Although largely replaced by more appealing configurations, it is still available through our components division and is known as the “C” and “D” panel. The “D” panel has the extra purlin bearing leg for roof application.
Standard Screw Down Roof Panel
To help achieve just the look you want in your new building, we have a selection of attractive, long-life, low-maintenance panel systems.
The deep-ribbed “PBR” panel is ideal for roof and wall applications. It provides an even-shadowed look designed for commercial and industrial applications.
Description: This purlin bearing leg panel is used for the roof, deep ribs create an even-shadowed appearance. The area between the ribs is reinforced.
Gauge: 26 and 24
Length: 45′ maximum is standard but longer lengths available by special request.
Fasteners: Standard coated, zinc- aluminum cast head, or stainless steel head screw.
Dimensions: 36″ coverage x 1 ” deep.
Finish: Galvalume Plus® and Commercial – Industrial Series Paint.
Usage: Roof or wall panel applications. As a roof panel the “PBR” panel offers the extra purlin bearing leg and offers more leakage protection.
Limitations: Not designed for coverage over bar joist. Not designed to be used as rigid secondary. Five foot on center purlin spacing.
Features and Benefits of the “PBR” Panel:
- 36″ coverage allows ease of installation.
- Die formed ridge saves time on installation.
- The panel is manufactured at all plants allowing low freight to any location.
- Start installation at either end; therefore, allows flexible installation.
- The economical profile is cost effective.
- Finish Warranty available. The panel has a 20-year life span when used with long life fasteners.
- Profile light transmitting panels are available for the “PBR” Panel.
- Extra Purlin Bearing Leg ensures flush fit for better sidelap connections, and fewer leaks.
PBR Roof Panel Installation
It is recommended that both sides of the ridge of a building be sheeted simultaneously. This will keep the insulation covered for the maximum amount of time, and the panel ribs can be kept in proper alignment for the ridge panel or cap. As the sheeting progresses, check for proper coverage. See illustration for panel sheeting sequence.
The ridge of the building is the horizontal line formed by opposing sloping sides of a roof running parallel with the building length. The ridge is covered by a transition of the roofing material, often called a Ridge Panel or Ridge Cap. When a ridge panel matches the configuration of the roof panel, it is called a die formed ridge panel.
Die formed ridge panels are to be installed as each side of the roof is sheeted. This aids in keeping both sides of the roof aligned. See illustration for clarification.
Standing Seam Roof Panel Systems
We offer four different Standing Seam Roof Panel Systems:
- BattenLok® Architectural Panel
The screw down roof is obviously the most economical choice for a roofing system. However, at times a roof may require a standing seam panel system, especially on a building with a roof slope of 1/2:12 or less. Overall benefits and selling points of a standing seam roof system are:
1.Unique Floating Clip
The standing seam system is designed to cope with the forces of expansion and contraction with a unique floating steel clip that allows the roof panels to move freely up and down the roof slope. The floating clip is also self-centering, insuring thermal expansion capability in either direction.
2.Virtually Leak Proof
The Standing Seam Systems are virtually leak proof, since the only penetration made in the roof during installation is in the eave panel, which is located outside the building shell. Standing Seam eliminates penetrations elsewhere in the roof, which are the major causes of leaks.
3.Ideal Retrofit Roof System
Standing Seam systems are ideal for new building roofs, and as a replacement roof for older buildings having either a metal or built-up roof. In some cases standing seam panels can be installed without interrupting normal business operations. When retrofitting with standing seam, building owners also have the opportunity to install additional insulation that can result in significantly lower heating and cooling costs.
4.Energy Efficient/Lower Operating Costs
Standing Seam roof systems easily accommodate insulation material to provide a building that is highly energy efficient. When special insulation requirements occur, thermal barrier materials are available for use over the purlins in order to effectively reduce heat transfer and maintain the thermal integrity of the roof system.
Properly installed, a building with a standing seam roof system can mean lower initial heating and cooling equipment costs, as well as lower fuel costs over the life of the structure.
The Manufacturer’s technical staff supports the needs of architects, contractors and owners by providing detailed product specification information and engineering or design assistance. The standing seam roof systems are designed to meet the ever-changing AISI specifications and other industry codes. This technical support ensures that each roof is right for each building.
6.Longevity of Materials
To ensure long life, all standing seam roof systems are formed from 24 gauge Galvalume Plus®, an aluminum-zinc alloy coating applied to the steel substrate by the hot-dip process in accordance with ASTM A-792.
When a painted finish is desired, we offer the superior Royal K-70® fluorocarbon paint coating, formulated with 70% polyvinyulidene fluoride resins. The Manufacturer stands behind Royal K-70® painted panels with a comprehensive optional warranty assuring protection for up to twenty years against blistering, peeling, cracking, chipping, excessive color fade and chalk.
7.System Quality and Performance
The standing seam roof systems eliminate the need for through fasteners by interlocking panel edges at a raised seam, utilizing a factory applied sealant. This, in conjunction with the floating action of the concealed clip assembly, is the basis of the superior performance of The Manufacturer’s standing seam roof systems. Combined with weather tight construction, excellent materials and overall strength these qualities result in a versatile, efficient and maintenance free roof system with a lasting appearance and structural integrity.
Ultra-Dek® and Double-Lok®
Panel Size: 24″ wide, 3″ high standing seam
Configuration: The female leg is suitable to accept the other male leg and form a locking assembly or seam.
Gauge: 24 gauge structural quality aluminum alloy coated. Minimum yield stress of 50,000 psi. 22 gauge available upon request but not a standard offering.
Substrate: Galvalume Plus®
Standard Colors: Architectural Series
Warranty: 20-year available
Sealant: Factory applied mastic
Insulation: Can accept up to 6″ of fiberglass and 1″ rigid thermal blocks
Endlaps:Prepunched endlaps ensure proper placement of fasteners. Mastic is applied between panels and secured with #1/4 – 14 x 1 1/4″ self-tapping fasteners through the panels and into the backup plate to form a compression joint.
Fasteners: Standard coated, zinc- aluminum cast head, or stainless steel head screw.
Light Transmitting Panels: Optional insulated or non-insulated
Usage: New and retrofit applications
Limitations: Recommended for roof slopes of 1/4:12 or greater. When using the fixed clip we recommend for double slope buildings 200′ wide or less, and single slope buildings 100′ wide or less. (May vary upon extreme weather conditions).
Features and Benefits of Ultra-Dek®:
1.No panel penetration is required inside the building envelope other than at the endlaps connected by a compression joint, which seals out the elements.
2.Panel side laps arrive at the job site containing factory-applied sealant, which contributes to the system’s weather tight construction.
3.Optional weather tightness warranty that assures that the roof system will remain weather tight for extended service life.
4.May be factory notched at both ends, allowing for field installation to commence or finish from either end of the building.
5.Endlaps have a 16 gauge backup plate with prepunched holes allowing for a solid connection at endlaps and proper fastener spacing.
6.High or low clips accommodate a variety of insulation systems, with up to 1″ thermal spacers at the purlin.
7.Does not use the mechanically seamed system. This panel interlocks when snapped together; therefore, there is no need for seaming equipment, allowing ease of installation.
8.Economical standing seam roof panel.
Usage: New and retrofit applications.
Limitations: Recommended for roof slopes of 1/4:12 or greater. When using the fixed clip we recommend for double slope buildings 200′ wide or less and single slope buildings 100′ wide or less (May vary upon extreme weather conditions). Oil canning is not a reason for rejection.
Features and Benefits of Double-Lok®:
1.No panel penetration is required over the building envelope other than at the end laps, which are connected by a compression joint, which is specially designed to seal out the elements.
2.Panel side laps arrive at the job site containing a factory pre-applied sealant, which contributes to the system’s weather tight construction.
3.Optional product and weather tightness warranty is available, contributing to additional customer confidence.
4.May be factory notched at both ends allowing for field installation to commence or finish from either end of building or on both sides simultaneously
5.Endlaps have a 16 gauge backup plate with prepunched holes allowing for a solid connection at endlaps and proper fastener spacing.
6.High or low clips can accommodate a variety of insulation systems, including 1″ thermal spacers at the purlins.
7.80% less exposed fasteners than traditional side lap panels and all fasteners are long life allowing for increased weather tightness.
8.Panels available in low-gloss Kynar® paint with a 20-year finish warranty, which minimizes appearance of oil canning.
9.The side lap has been tested for air infiltration and water penetration under ASTM E283 and E331 methods. Minimal air infiltration and water penetration and acceptability among specifiers.
BattenLok® – Architectural Standing Seam Panel
Panel Size: 16 inches wide, 2 inch high standing seam
Gauge: 24 gauge, 22 gauge available on request but not standard
Substrate: Galvalume Plus®
Standard Colors: Architectural Series
Warranty: 20-year available
Sealant: Factory applied
Insulation: Can accept up to 6 inches blanket fiberglass and 1 inch rigid board thermal blocks
Seamed: Roof is mechanically seamed in the field
Concealed Clips: A choice of concealed fastening clips is available for this panel system including UL rated clips. These clips hold the panel firmly in place without unsightly exposed fasteners. Each clip system offers the ability to accommodate thermal movement.
Ideal Retrofit Roof System
Usage: This panel is a structural panel that spans up to five feet on purlins, or can be used as an architectural panel over a solid deck. This flat panel is designed with striations to minimize oil canning. It is designed to meet the ever-changing AISI specification and other industry codes.
Limitations: Recommended for roof slopes of 1/2:12 or greater. Oil canning is not a reason for rejection.
Advantages of BattenLok®:
1.Aesthetically pleasing architectural design with vertical ribbed seams, which are easily custom flashed.
2.A great product for hip and valley, and turndown mansard application. The panels can be turned down over the eaves to form a wall panel appearance.
3.A feature of the BattenLok® is that the sidelaps are mechanically seamed with an electric seamer for a sure lock.
4.This system features easy to handle 16″ wide panels with over 50 years of service in the marketplace. The proven durability and performance of the BattenLok® panel, with the factory-installed mastic and swaged endlaps, ensures weather tightness.
5.BattenLok® is a structural panel that spans up to five feet on purlins, or can be used as an architectural panel on plywood and felt substrate.
6.BattenLok® is a flat panel with vertical ribs creating no voids, therefore, no eave closure plugs are required
7.BattenLok® is designed to meet the ever-changing AISI specifications and other industry codes
8.The natural forces of expansion and contraction can cause roof leaks with conventinal roof materials. The BattenLok® system is installed using special clip assemblies that allow for roof movement. This system is designed to handle thermal shock; therefore, it won’t crack, blister, absorb moisture or require painting, patching, or caulking usually needed with ordinary nonmetal roof system.
Description: The SuperLok® standing seam roof system blends the aesthetics of an architectural panel with the strength of a structural panel. This panel has earned uplift ratings that are the highest in the industry for standing seam roofs, assuring the reliability of performance. This panel is Factory Mutual approved to satisfy stringent code requirements and is ICBO approved.
Gauge: 22 and 24 (Minimum quantity may be required)
Finish: Galvalume Plus® and Architectural Series
Lengths: Recommended 50′ 0″ maximum.
Fasteners: Concealed fastening system. A choice of concealed fastening clips is available for this panel system including UL rated clips. These clips hold the panels firmly in place without unsightly exposed fasteners. Each clip system offers the ability to accommodate thermal movement.
Dimensions: 12″, or 16″ wide and 2″ high
Usage: SuperLok® is a field-seamed panel that combines a slim rib with exceptional uplift resistance. This panel has been designed to withstand the most rigorous conditions. This system was designed to be installed over open framing, 5/8″ plywood, or a composite roof assembly may be used as alternate substructures.
Limitations: Minimum recommended slope: 1/2 on 12.
Features and Benefits of SuperLok®:
1.Can be installed over purlins and bar joists.
2.Factory notched for endlaps allowing ease of installation.
3.Clip allows 2″ panel movement allowing for expansion and contraction.
4.Sealant factory applied for less field labor and longer life.
5.Weather tightness warranty available
6.Metal Closures for longevity
7.Machine seamed which meets stringent code requirements, such as, Factory Mutual
BattenLok® and SuperLok® panels have striated surfaces to meet the demand of any design challenge. While the Manufacturer has recognized and responded to this requirement we have a responsibility to point out that a wide and perfectly flat appearance is not possible. In some wide products, panel distortion, called oil canning, will occur and tolerance and/or additional support behind the panel may be more visible under certain lighting conditions. Minimizing foot traffic during and after installation can eliminate the need for additional support behind panel faces.
The Built-Up Roof
Built-up roofing is so called simply because it is a combination of layers of various materials built-up into a composite covering from a base or roof deck. This type of roof is particularly suitable for flat surfaces; and when made of good materials and properly installed, it may provide satisfactory protection from the elements for many types of commercial, community, and industrial buildings.
Presenting general information about built-up roofs is difficult because so many types are available. A comparison of any two built-up roofs must take into consideration the relative quality of materials and workmanship, as well as any differences in basic design.
Built-up roofing can be laid on decking made of wood, steel, gypsum, or concrete slab. Probably the most common roof in use today is installed on steel decking, which is supported by a bar joist system. Steel roof decking is usually made of 22 or 24 gauge steel and is fastened to the bar joists by welds or screws. Although different applicators might use a variation of materials and procedures, here is one example of a built-up roof on a metal deck.
The first step involves the installation of rigid board roof insulation with screws or nails through disks or plates. If a second layer of insulation is specified the joints are staggered and a recommended adhesive or asphaltic bitumen bonds the two layers together. Once in place the insulation is mopped or strip coated in preparation for the next layers.
Next, several layers of roofing felt are laid between mopped-on layers of heavy bitumen. Roofing felt is made of heavy paper or cloth, impregnated with waterproofing materials. Generally from 3 to 5 layers are applied. The number of layers properly installed determines the permanence of the roof system.
Finally, a protective-wearing surface of gravel, slag, marble chips, or a roof coating material is often spread over the topcoat of tar. Built-up roofs represent an area of considerable competition, and you will find it beneficial to become knowledgeable on the various types and methods used in your area.
Advantages of a Built-Up Roof
- Built-Up roofs accommodate roof penetrations with relative ease.
- Built-up roofs have enjoyed public acceptance for many years.
- Built-up roofs are well adapted to the construction of flat or very low pitch roofs.
Disadvantages of a Built-Up Roof
- Due to ultra-violet breakdown, the life cycle expectancy of this type of roof system is very limited.
- Maintenance is often necessary and expensive. Tars and asphalts gradually lose their natural oils, dry out and crack with exposure to the natural elements.
- The bonds or warranty on built-up roofs have many limiting conditions.
- They are not usually fire-safe.
- Trouble spots and damage are not easily detected until it is too late to correct them economically.
Single-Ply Roofing Membranes
A new generation of roofing membranes has established itself along side the traditional built-up roofs. Made of synthetic elastomers, the new materials are generally provided in preformed sheets. The preformed sheets are delivered to the site in rolls. The rolls are sometimes large enough to cover an entire roof area, but most of the time; successive strips are placed adjacent to one another and sealed where they overlap.
The ability of elastomeric to elongate, even in subfreezing temperatures, may be their greatest asset as roofing membranes. Substrate movement, a by product of normal building movement, is accommodated by elastomeric roofing systems with its physical characteristics and installation techniques. Elastomeric roofing membranes are in general single-layered, synthetic polymer materials with elastic properties.
Types of Single-Ply Roofing Membranes:
Neoprene: The first synthetic rubber. Neoprene exhibits good resistance to petroleum oils, solvents, heat and weathering.
EPDM: An elastomer synthesized from ethylene, propylene and a small proportion of a diene monomer. It has good resistance to ozone and is inexpensive, and lightweight.
PVC (polyvinyl chloride): Through plasticizing and proper formulation, PVC materials can be obtained which show elastomeric properties and ease of installation.
ECB: This thermoplastic material is a mixture of ethylene, copolymer, bitumen, and anthracite micro-dust. The membrane resists aging and the effects of weathering, and can be repeatedly heat formed without detriment to its original qualities.
PVC and EPDM currently dominate the preformed sheet market.
Methods of Erection Elastomeric Roofing Membranes Can Be Installed in One of Three Ways:
- Loose Laid
- Partially Adhered
- Fully Adhered
The loose laid system directly illustrates the principle behind elastomeric membrane design: floating free, the roofing membrane expands to accommodate substrate movement at any part of the roof.
A typical loose laid system is held in place with ballast, preferably river bottom gravel. Insulation is placed directly on the substrate without attachment. There is no bonding between the loose laid membrane and the substrate, except at the perimeter of the roof and at the roof penetrations. These areas require careful design and installation. If the membrane consists of more than one section, a sealing technique is applied to achieve a band at the laps. The ballast weight is typically specified between 5 and 10 pounds per square inch, depending on the size and shape, and protects the membrane from the ultra violet rays of the sun and wind uplift.
The partially adhered is a modification of the loose laid system. The partially adhered system provides for a restricted amount of movement and partial bonding is achieved with the use of adhesive or with a combination of adhesive and mechanical fasteners. If adhesive is the bonding agent, it is applied in strips to allow for a specified percentage of unbonded area. To separate sections of the membrane from the substrate, a bond breaker such as masking tape is sometimes used.
If bonding with mechanical fasteners, generally nails or screws with disks or plates, are installed on top of the insulation and serve to attach the insulation to the roof deck (substrate). The membrane is then bonded to the disks or insulation board with the adhesive.
The fully adhered system bonds the entire membrane to substrate with an adhesive and often with mechanical fasteners as well. The fully adhered system functions very much like a conventional built-up roof.
The decks (substrates) commonly used with elastomeric systems are metal deck, concrete, and plywood.
The integrity of elastomeric roofing systems is directly related to the proper installation of seams. Two types of seams are performed with elastomeric sheets, most commonly lap seams and very infrequently, butt seams.
Both sealants and sealing techniques must be compatible with the membrane materials. The following is a list of sealing methods and materials:
Adhesive is used with thermosetting materials such as neoprene and EPDM. The adhesive is usually applied to both substrate and to the bottom surface of the membrane. The sheets bond directly to the substrate, and mechanical pressure is usually applied to assure bond strength.
Heat welding is used with thermoplastic materials such as PVC. A controlled source of heat melts the material until it welds itself together.
Solvent welding is again used with materials such as PVC and is a technique interchangeable with heat welding. The material becomes soluble in solvent cement and the seams are fused together. Immediately afterward mechanical pressure should be applied to achieve proper bond strength.
Other methods are utilized with other materials, but the methods just described are primarily used.
Advantages of Single-Ply Membranes
- Economical Installation
- Roof Penetrations are Easily Accommodated
- Expansion and Contraction
Disadvantages of Single-Ply Membranes
- Short Life Cycle (Ultra-Violet Breakdown)
- Dependency Upon Workmanship
- Susceptible to Foot Traffic Punctures
- High Cost of Material
- Material is Combustible
By studying the details of various roof systems you will acquire basic product knowledge that makes you familiar with the specifications, types of material, fastening systems, options and applications of our different metal roof systems. The objective is to provide you with the best possible roof protection, equal with your needs and your budget.
One of the most important functions of a building is to keep out the elements: rain, ice, snow, and wind.
Built-up roofs can, of course, be quite satisfactory, but organic materials must eventually decay; therefore, it is necessary to establish a budget for periodic maintenance to assure the lasting weather tightness of built-up roofs. On the other hand, many building systems manufacturers make roofs of materials such as coated galvanized steel, aluminum, copper, aluminum coated and aluminum zinc alloy. Inorganic materials take a firmer stand against the elements.
Even an inorganic roof that is weather tight at the time of construction may cause the owner inconvenience and costly maintenance if the original design failed to consider the effects of wind uplift and expansion and contraction.
When the wind blows over the roof of a building, suction is created. Similar to the airfoil effect on the wing of an airplane, this exerts an upward pull, or wind uplift, on the roof. Therefore, the stronger the wind, the stronger the upward force wanting to separate the roof from its supporting framework.
Expansion and Contraction
Every roof moves due to expansion and contraction. Unlike the forces of wind uplift, you cannot resist the forces of expansion and contraction without impairing the weather tightness of your roof. Therefore, your roof must be designed to allow for that movement.
Both the Manufacturer’s screw down and standing seam roof systems allow for roof movement horizontally (across the width of the building) and longitudinally (along the length of the building).
The screw down roof system allow for the horizontal movement by the panel corrugation, while the natural roll of the purlin handles the movement in the other horizontal direction. When the roof contracts due to the cold, the purlins have a natural tendency to roll toward the ridge. When the roof expands due to the heat, the purlins have a natural tendency to roll away from the ridge. The forces of expansion and contraction would cause fasteners to be loosened, requiring annual maintenance if the Manufacturer did not allow for the horizontal movement.
The standing seams roof systems allow for horizontal movement in a much different fashion. The horizontal movement in one direction is again handled by panel corrugation, and the movement in the other direction is accomplished with a floating clip, which joins the panels to the purlins without the need of any holes through the panel’s roof surface. The floating clip allows the roof to move horizontally 2″ in each direction, accommodating for the expansion and contraction imposed on the roof.
However, with a standing seam roof, the purlins have a bracing system of knock-in-bridging to reduce the natural roll of the purlins. The standing seam roof clip is attached to the purlins via self-drilling fasteners, and the clip is attached to the panel leg. The knock-in-bridging helps the purlin system to be more rigid. If the purlins were to move the standing seam roof system would not resist wind uplift or live load forces and the clips would not stay fastened correctly.
When a building length gets over 500 feet, it may be necessary to also accommodate for longitudinal movement. Expansion and contraction of a buildings roof system causes lengthwise movement. The Manufacturer may accommodate for longitudinal movement with an expansion joint and transition trim. An expansion joint is basically an extra slotted clip attached to the purlins, allowing the purlins to move in the longitudinal direction. If longitudinal movement is not accommodated for the sidelap of the panel system, it may have the tendency to tear apart.
All roofs are subjected to these different forces of nature; wind uplift, horizontal movement and longitudinal movement due to expansion and contraction, live load, or snow load. The optimum roof system is one that is designed and constructed so that it is anchored securely to the building (to support wind or live load). However, the roof system should be able to move in any horizontal or longitudinal direction (to allow for the horizontal and longitudinal pushing and pulling of expansion and contraction). It should also maintain the complete weather tight integrity of the roof. Few built-up or traditional roofs can do that. We have unique and patented roof systems that are designed and tested to withstand these forces.
Retrofit Roofing Solutions
A significant market for SBS has become available utilizing the Retro-R®, BattenLok®, Ultra-Dek®, and Double-Lok® roof systems as not only a re-roofing solution, for both built-up and metal roofs, but also a new roof solution for ordinary construction.
Built-up Roof being Retrofitted with Standing Seam Roof System and added insulation.
Completed Retrofit using Standing Seam Roof System.
Re-roofing has often been thought of as a last resort. Only after a present roof has been patched, repaired, resealed and repaired again, will a building union consider installing a new roof on his/her present building.
Description: Retro-R®, the patented retrofit roof system is the fastest and most economical solution to your re-roofing dilemma. This one-step setup is designed for easy installation over your existing metal roof. Retro-R® is cost effective with savings up to 50% over other roofing solutions. And because it is so easy to install, Retro-R® will not interrupt the normal course of your business. Retro-R® is available in a wide variety of colors or with a Galvalume Plus® finish. Let Retro-R® save the day, by saving time and money.
Finish: Galvalume Plus®, and Commercial Industrial Series
Fasteners: The manufacturer recommends a “Long life fastener”. The manufacturer does not recommend self-drilling fasteners.
Advantages of Retrofit Roof Systems:
1.Get rid of leaks for the long term. Compared to traditional roofing systems, Retrofit roofs provide superior weather tightness, effectively draining rain and snow. Unlike flat built-up roofs, Retrofit roof systems are sloped, so water doesn’t stand. They also drain to the building’s exterior, further decreasing the chance of leaks. In certain environments, the life cycle of a Retrofit roof system can extend 40 years or more when properly maintained.
2.Save on Maintenance. Materials in built-up roofs expand and contract at different rates during temperature changes, causing cracking, flaking and shrinking. Retrofit roof systems expand and contract at the same rate, minimizing damage. They also resist corrosion thanks to the aluminum-zinc alloy coating.
3.Save on Energy Bills. When installed correctly with the proper insulation, Retrofit roof systems can lower climate control costs, saving more money.
4.Fast, easy installation. Because the Retrofit roof systems simply cover your existing built-up roof, installation is fast, convenient and economical. There is no need to interrupt daily business activities, and in some cases, can be installed with no on-site modification.
5.Update Building’s Exterior. With a Retrofit roof system, you can enhance an outdated roof, or simply dress up the building’s appearance, quickly and easily. Retrofit roof systems feature innovative design details and adapt to facades and light transmitting panels.
Fact is, even the best built-up roofs can leak, but a retrofit metal roofing system substantially lowers chances of roof failure due to atmospheric conditions. With proper installation, these durable, weather tight roofs can provide years of trouble-free protection. They go up over the existing roof so there’s no troublesome material tear-off or costly interruption of daily operations. What’s more, a Retrofit system is an economical way to enhance the facility’s exterior.