Vinyl Siding - How To Put Vinyl Siding On A House

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Vinyl siding is plastic exterior siding for a house, used for decoration and weatherproofing, imitating wood clapboard, and used instead of other materials such as aluminum or fiber cement siding. It is an engineered product, manufactured primarily from polyvinyl chloride (PVC) resin. In the UK and New Zealand a similar material is known as uPVC weatherboarding.

Approximately 80 percent of its weight is PVC resin, with the remaining 20 percent being ingredients that impart color, opacity, gloss, impact resistance, flexibility, and durability. It is the most commonly installed exterior cladding for residential construction in the United States and Canada.

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History

Vinyl siding was introduced to the exterior market in the late 1950s as a replacement for aluminum siding. It was first produced by an independently owned manufacturing plant called Crane Plastics in Columbus, Ohio. The process was originally done through mono-extrusion, a process of forming the profile from a single material into the desired shape and size. At that time, blending of colors was done manually.

This original process made it difficult to produce and install a consistent, quality product. Beginning in the 1970s, the industry changed its formulation to improve the product's production speed, impact resistance, and range of colors.

In the following decade, vinyl siding grew steadily in popularity in large part due to its durability, versatility, and ease of maintenance. However, in many European countries, for instance Germany, vinyl (PVC) is rarely used or phased out because of its negative environmental profile.

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Modern manufacture

Today, vinyl siding is manufactured by co-extrusion. Two layers of PVC are laid down in a continuous extrusion process; the top layer is weatherable and durable material, which comprises up to 25% of the siding thickness. This capstock can include about 10% titanium dioxide, depending on the color, which is a pigment and provides resistance to breakdown from UV light. Vinyl siding, like anything that is exposed to the sun, will inevitably fade over time, but the fade rate is a lot slower with vinyl than most other claddings. Most manufacturers offer 50 year warranties that their products will only fade a little over that period of time. In the past darker colors tended to fade more than lighter ones, but advancements in technology and materials this is no longer the case. With these advancements darker colors like dark reds or blues show very little change in color, but they do cost a little more. The lower layer, known as substrate, is typically about 15% ground limestone (which is largely calcium carbonate). The limestone reduces cost, and also balances the titanium dioxide, keeping both extrusion streams equally fluid during manufacturing. A small quantity of tin mercaptan or butadiene is added as a stabilizer to chemically tie up any hydrochloric acid that is released into the PVC material as the siding ages. Lubricants are also added to aid in the manufacturing process.

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Specs and product variables

Vinyl siding can be observed in a wide range of product quality realized in a substantial difference in thickness and lasting durability. Thickness can vary from .035" in cheaper grade siding products up to .052" in the highest grade products which vary from manufacturer to manufacturer. Today, the thinnest vinyl siding commonly used is .040", and is known as "builder's grade". Vinyl product can vary in thickness even within one manufacturer up to .010" of thickness through varying product lines offered that range from basic to premium-grade products. Thicker vinyl products, usually realized in higher cost, are more rigid which can add to the aesthetic appeal and look of the installed, inherently flexible product and also add to durability and life expectancy. Thicker grades of vinyl siding may, according to some, exhibit more resistance to the most common complaint about vinyl siding - its tendency to crack in very cold weather when it is struck or bumped by a hard object while others feel that a thinner product may allow more 'flex before cracking' and is a subject of debate. However, at "This Old House" website, this assertion about thickness and crack resistance is disputed. They claim to know of test results that indicate chemical makeup has a greater influence on impact resistance than does thickness.

Chemical formulas can also vary somewhat from manufacturer to manufacturer which can impact life expectancy as formulas and possibly manufacture process can be one of the most important in terms of product quality and durability. One important advent was a UV "coating", utilized by some manufacturers that was applied to the surface of the product that filters out UV spectral light from the sun which would otherwise degrade the PVC more quickly. As a rough general rule, the higher the grade (and price) of the siding, the more resistant it is to fading (intensity of the color being taken into consideration, as mentioned above).

Vinyl siding is manufactured with its own partial fastening or locking system that is coupled with nails that 'loose' fasten the product to the exterior wall. This locking system can be either a rolled or an extruded lock depending on the manufacturing process, either of which has its own design considerations. This locking system, either extruded or rolled has a bottom lock which locks into either a start piece or onto the top lock of the panel below. The top lock is then 'loose' nailed to hold the panel to the wall. This 'loose' nailing allows for float which is created by expansion and contraction from varying temperature and weather conditions. With well designed siding, and proper 'loose nailing' installation, the siding can easily expand up, down, in and out, and left and right without restriction. Vinyl siding, by its nature, will tend to expand and contract more with temperature extremes than any other common type of cladding.

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Environmental aspects

Vinyl siding, like natural wood siding, is flammable. The natural fire retardancy of PVC is a double-edged sword in that building materials may smolder, giving off hydrogen chloride gas, for long periods of time before visible signs of fire appear. When PVC burns, many toxic compounds are produced, including the extremely hazardous hydrogen chloride and dioxin.

Concerns by Organizations

Because of its thin profile, vinyl siding may be more likely to ignite due to exterior fire; for example, the National Institute of Standards and Technology found that, in tests involving vinyl-clad structures in close proximity, fire was observed to spread between two vinyl-clad test structures located six feet apart in fewer than five minutes. Additionally, vinyl siding can release toxic fumes when burning, particularly dioxins. This is not only an environmental concern, but the fumes can be dangerous to firefighters and bystanders, and the toxic fumes released may increase the likelihood of fatality from smoke inhalation for anyone trapped in the burning structure.

The National Association of Home Builders (NAHB) recommends using building materials that require "no additional finish resources to complete application on site" for green home builders as they reduce waste and materials used. Installing vinyl siding involves neither paint, stain, nor caulk and thus meets this NAHB requirement. Though vinyl siding does actually require caulk to seal seams where the siding J (border trim that the sliding slides into) meets windows and doors.

The Environmental Building News validated the issues raised by Greenpeace and said it was not the only organization with environmental and health concerns about vinyl. They emphasized the risks of additives like the plasticizer DEHP.

The position of the International Association of Firefighters, which represents fire fighters in the U.S. and Canada is: "Due to its intrinsic hazards, we support efforts to identify and use alternative building materials that do not pose as much risk as PVC to fire fighters, building occupants or communities."

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Health Concerns

The PVC used in vinyl siding used to be produced in open vats until 1971, when angiosarcoma, a rare cancer of the liver, was traced to vinyl chloride exposure among PVC workers, and strict workplace exposure limits were established by the Occupational Safety and Health Administration. These changes required all vats to be tightly sealed, which led to greater capital costs and a concentration in the number of producers.



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