Residential metal roofing system
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In today's highly competitive roofing market, a contractor to achieve success must walk in front of professional and quality, for example, the correct choice of roofing systems and products. Residential metal roofing system is very good - the kinds of programs will help to improve the status of contractors in the competition.
In recent years, STONE COATED metal roofing products in residential applications has increased. In some areas, such as coastal and mountainous areas, the use of metal roofing system than in the past become more prevalent. Experience has shown that metal roofing is used more and more extreme climate.
STONE COATED Metal Roofing Association (MRA) is expected to metal roofing in the residential roofing market share each year will be 20% to 25% the speed of growth. To achieve this goal, the metal roofing industry must continue to focus on improving the user's awareness, but also to intensify training on commercially available products and their use for roofing contractors and distributors. Perhaps the most fundamental thing is to clarify the role of the difference between the different metal roofing products, and these differences in the metal roofing system to meet the owners' request to build a successful.
Application
A misunderstanding of residential metal roofing is that most of this roof for new construction. In fact, the NRCA annual market survey, 11% of residential metal roofing in 2004 for the new 56% renovation, 11% for maintenance and repair. Visible, metal roofing is more for the refurbishment of one of the reasons is that many metal roofing products can be laid on the existing roof, such as various metal tile and standing seam product.
Commercially available product variety and often will do a muddle. In North America, there are more than one hundred kinds of vinyl tile panels, imitation shingles, slate and clay tile, cement tile other tile material. Each product is the exclusive production and sales, and can not be interoperable. Is necessary to understand some product knowledge to ensure the proper construction and application.
Product
Determine the form of metal roofing systems, it is necessary to select the product of the roof slope and geometry. For example, the most tile product is suitable for roofing minimum slope of 3/12. Low sloping roof, the main site mechanical or hand joints standing seam panels, such as "Twill" or "buckle plate.
Modulus products for interlocking panels, ranging in size from 203 mm × 305mm to 610mm x 914 mm. This problem of thermal expansion and contraction of the roofing system has a variety of approaches. Some in the construction, expansion or sliding clip, and thermal expansion board "floating" up; "folding effect", and some products are designed with use of the board of the board of the S-shaped equivalent to many fold to withstand thermal expansion and contraction. Such products can be made of imitation stone or imitation glass tile, vinyl tile, and other imitation Tongwa or tile.
The stiffness of these products plus the space between the metal plate and the grass roots to make them in a renovated since then shop in the existing roof. Fact, such a system even through the shingle bar or specialized fixed spread on the shingle.
In addition to the special form of modulus board, there are many products can be used for residential vertical joints. These products from the house along the shop to the roof rafters or parallel or perpendicular. The vertical seam roofing products include a variety of penetrating the fixed waveform panels and standing seam product.
Penetrate the board roof with a variety of standard length, laying with horizontal seams and end laps, size can also be off-site in order to avoid the end of the lap. Vertical slit the length of the products are generally customized to meet the actual size of the roof.
A key factor in the laying of all vertical seam product must ascertain that the manufacturer requires board shop on the lath or solid board. Although these products were originally laid in the lath, but the manufacturer for application in agriculture, often with solid plate and cushion.
Fixed-length penetrate the fixed or standing seam roofing product safety and transportation is very important, because sometimes plate length up to 8 m or even longer. In order to avoid such transportation problems, and sometimes movable roll forming machine to the live production. Even so, the board in the field transportation still be careful and require specialized knowledge, because many board transportation is upright.
Type of metal
Discussed above, a variety of metal roofing products with a different metal in order to obtain specific effects and features. MRA's survey shows that the metal roofing products with the main materials are steel, there are two forms, galvanized and Galvalume.
Galvanized steel are zinc coated to improve corrosion resistance, Galvalume steel-plated aluminum alloy, and also for the purpose of preservative. Both steel of various grades. The level is determined on the basis of both sides of the zinc plating on steel or aluminum coating thickness. Accordance with the quality standards of the Metal Construction Association, if the metal surface coating, G90 is the recommended lowest level of the galvanized steel, AZ50 Galvalume the recommended lowest grade. Level of surface finishing or impose transparent coating is recommended for Galvalume AZ 55.
There are some metal can be used, such as aluminum, copper, zinc, stainless steel and tin-lead alloy. Aluminum is mainly used for corrosion protection purposes and to use its malleability, can be processed into fine grain tile effect. The aluminum roof is always made of coated or anodized to get the special color and better durability. Copper, zinc and stainless steel for uncoated occasions. Copper is the use of its good durability and rich features of the patina. Zinc is also used for preservative purposes, and its malleability, low-gloss gray appearance. The stainless steel used to obtain long-lasting, shiny silver appearance or the need to meet specific corrosive environment.
Product Compatibility
Metal roof construction according to the electrochemical point of view, all the materials used in the system must be compatible, otherwise, even between different metals and other materials between the occurrence of electrolysis and corrosion. This includes fasteners, flashings, gutters and adjacent to the parapet wall materials, they must be compatible to avoid contact.
As mentioned above, for aesthetic reasons, many metal surface has a coating or overlay. The coating has several, including acrylic, polyester, silicone polyester, and polyvinylidene fluoride (PVDF). Registered trade name of the PVDF coating Kynar and Hvlar, and they always applied to the metal on the roof molding. More durable coating also includes the performance of the color fastness and resistance to chalking, which - point, consultation with customers is very important.
Familiar with the paint industry, people know that the most difficult to fading pigments are inorganic ceramic pigments, it is more expensive than organic pigments, the use of this pigment coating inorganic pigments. PVDF coatings to improve coating adhesion of the resin is a fluoride, can produce a strong molecular bond the pigment firmly grasp to prevent chalking. Some modulus of metal tile in forming later and then apply the coating, known as "painted", to ensure that the metal surface can be stretched in the molding process to get full coverage. The most common type of post-coated stone cladding, stone bonded to the steel surface of the ceramic surface. The alternative is to apply powder coatings, molding board of PVDF powder coating. These coatings product has a texture and a variety of colors.
Specifically for metal coatings to improve the durability of metal roofing, steel roofing products, coated with high-quality coatings can protect the grassroots from the effects of climate, is to make products with the durability of a way. In addition, metal roofing system, there are many other advantages.
Advantage
One of the advantages of metal shore surface is light weight - like aluminum tile roof weighs only 4.84 kg/m2, stone surface covered tile is 16.15kg/m2 significantly lower than other roofing materials such as fiberglass shingles to 25 .8 ~ 40 4kg/m2. Light weight, this product is available in the original roof, reducing the weight applied to the roof structure.
In addition, the interlock characteristics of the metal roofing system or a non-interlock between the metal plate fixed and the fixed characteristics of the roof to make the most of the metal roofing system with a good wind exposing. In many cases, the products can reach UL 580 "roof wind exposing test standard provides the UL 90 or UL1897 roof covering system wind exposing" provision.
The high wind exposing give priority to the use of a metal roof in many places, but some places the system is to use its fire resistance. In fact, vinyl tile, aluminum and steel products in the United States some of the favorite place of shingles in the last century, the sixties and seventies as a fireproof roof. The past decades various types of metal roofing with a lot of is out of this consideration.
2003 International Building Code requires roofing system fire performance test shall be conducted, but does not include the steel and copper tile roof (board), taking into account their inherent good fire performance. Of course during the metal roofing pre-construction best to check local building codes.
Another advantage of the metal system is the coating of the above make it a "cold" roof system. Coating on the metal roof because of its smooth surface does not set gray often than the coating on a porous or rough roof surface can longer be kept clean and light colors. Owners can periodically hosed down to keep clean. In addition, the coating for most metal roofing with a high radiation, depending on the coating, the minimum radiation rate of 0.75, can be as high as 0.95, so that the roof absorb heat quickly release Back to the atmosphere.
As technology progresses, many metal roofing products with coatings in the infrared reflective pigments, these specially treated pigments, even dark colors can also have very high solar reflectance performance. For example, nonreflective brown paint on the metal surface of the solar reflectance of only 6% to 8%, after joining the reflective pigment, the total solar reflectance can be increased to 25% to 30% or even higher. This meets the government agencies and the public sector "cold" roof reflectivity requirements of the initial value.
In addition, the design of metal roofing system set between the metal and cushion between the metal and roof still air space to further improve the efficiency of energy-efficient suspension of heat conduction. , Compared with the use of traditional roofing materials in accordance with the trial of the Florida Solar Energy Center, the imitation of the traditional metal tile roof still air space in the attic heat to reduce the 30% or more of a factor. Laying on battens modulus and standing seam metal roofing products, as well as possible through the ventilation space so that a further increase in energy efficiency.
Another advantage is the content of recycled materials in the metal products. Metal used in most of the steel roof contains 25% to 35% recycled materials. In the non-ferrous metals such as aluminum, copper, the content of recycled materials can be as high as 95%.
On the other hand, the modulus of metal roofing panels There are different ways to adapt to the special roof. Many watts the cross section is curved, for the round roof. In addition, exposure of 381 mm or smaller modulus board it is easy for most of the roof curve. Of course, the most fundamental is to get the manufacturer's information and help to decide how to live doing the best.
Attachment
Although some of the special shape of the roof need to custom-made metal plate and a pan of water, and residential metal roofing manufacturers to provide a wide range of standardized accessories, for the eaves, gables, roof drains, roof and slope changes and the roof wall junction . In some cases, manufacturers may also provide drawings of the site making attachments. The detail of many residential roof, including rainwater from the roof-oriented sink dripping along.
Standing seam roofing system, the bottom edge of each board around the start or dripping along the rolled up. Standing seam panels clamped with a clip and roof, and then the upper plate is fixed to live. For the penetration of fixed vertical plate, and some can not be locked to the starting tile board, manufacturers will usually provide the sealing strips and finally the roof fixed steps.
Gable disposal of a variety of methods, usually depends on the shape of the roof. There are three basic forms of the roof gutter, used in conjunction with a variety of metal roofing: flat discoid drains, l or 2 gutter pan of water, and the so-called Ming roof drains (open valley).
The disposal of the ridge there are several ways. Most of the perpendicular plate of the long roof and roof cover - as long 3 m or 4 m.
The slope change and the roof wall handover processing often require on-site production of the pan of water to conform to the shape of the roof. The manufacturers recommend a pan of water in the form of production in the small bending molding machine or in the local metal processing plant. Skylights and chimneys often need a special pan of water, and also some well-known brand manufacturers provide supporting pan of water.
Skylights and chimneys is important to remember that should not be over-reliance on the sealant. Although the need for the appearance of the sealant, as an auxiliary water means any metal roofing system pan of water, a line of defense should be a pan of water. Sealant and the cushion is only an additional waterproofing measures.
Skylights should be done in the skylight circle, so that the skylight was significantly higher than the height of the metal plate. Whenever possible, the chimney at the pan of water should be embedded in masonry. The roof wall junction flashings should be inserted or up out into the wall.
Attic ventilation and piping shall be the manufacturer's requirements for construction. Designed specifically for the metal roofing system pan of water for many species, and sometimes even the color can be equipped with well.
Of course, experienced roofing contractors know, when you think you have met all of the roof, new problems again. It should be remembered that the basic principles of the pan of water to let the water is always in the top surface of the metal plate flow. Good the flashings design often in the roof under the auxiliary water channel, in order to increase water reliability. Another point is not to make the roof on the trash, leaves, snow and ice blocking the path of the water. In addition, the design of special flashings to the roof should consult the manufacturer of architectural metal roofing reference NRCA manual (The NRCA of Architectural SheetMetal and MetalRoofine by Manu al).
Ventilation
The manufacturers recommend the practice of roof ventilation, roof ventilation products may include the patented product and market sale. Many vertical slit ventilation is through the use of specially crafted closed with the air can flow between the last rib of the roof, cornice care pull the vent as the air inlet.
Many people have a wrong perception, thought STONE COATED metal roofing system needs to increase attic ventilation. In fact, attic ventilation, whether what roofing materials are very critical, metal systems, the use of this and without the slightest change. Should also be considered in the choice of roof ventilation. Must be remembered that the production of condensate as a result of warm moist air in contact with cold surfaces. The purpose of attic ventilation is to remove condensation from happening.

In the past, residential metal roofing, the owners lack of awareness and contractors, lack of training is a major obstacle to this roof to promote, and now the situation has greatly improved. EDITED BY STONE COATED ROOFING TILES