Facings as Vapor Barriers

The main function of facings is to act as a vapor barrier. While a vapor barrier may not necessarily be able to stop the flow of water vapor, it does an excellent job of minimizing the rate and volume of the flow. This prevents moisture from accumulating within the insulation blanket and the structure, which translates into consistent thermal values and lower heating and cooling costs.

Facings intended to serve as vapor barriers should be installed on the inner, heated surface of the insulation, where vapor pressure is the highest. This helps in preventing vapor from reaching the cooler air and condensing.

VAPOR BARRIERS PREVENT VAPOR FROM REACHING COOLER AIR AND CONDENSING.

Commercial Buildings

It is said that close to 90% of all new commercial construction is a steel building system. The ease of construction makes a new steel building system more attractive to builders and owners alike. From carwashes to skyscrapers steel has, and will continue to lead the way. Steel buildings are great for workshops or manufacturing facilities, classrooms or church buildings, metal buildings are fast replacing less adaptable building systems. Today, more than ever our world is growing faster and more competitive. Architects and professional building designers are becoming more aware of the benefits of steel from a construction and economical standpoint. As new steel building systems are introduced, we see the bottom line improving on construction projects of all kinds. The ease of construction and versatility makes a steel building attractive for a variety of uses.

Condensation Control

The condensation process occurs when warmer moist air comes in contact with cold surfaces such as framing members, windows and other thermally conductive accessories, or the colder region within the insulation itself (if moisture has penetrated the vapor retarder). Warm air, having the ability to contain more moisture than cold air, loses that ability when it comes in contact with cooler surfaces or regions. When this happens, excessive moisture in the air is released in the form of condensation. If this moisture collects in the insulation, the insulating value is decreased.

In dealing with condensation, air may be considered to be a mixture of two gases-dry air and water vapor. One thousand cubic feet of air at 75°F can hold up to 1.4 pints of water. At 45°F, it can hold only 0.5 pints.

Relative Humidity is a percentage measurement of the amount of water vapor present in the air in relation to the amount it is capable of holding at that temperature. Therefore, 50% Relative Humidity would mean that the air is carrying only one-half of the total amount of moisture that it could be holding at that particular temperature. Cold outside air is usually much drier than warm inside air. Therefore, you can lower the Relative Humidity by bringing in outside air to mix with and dilute the moist inside air. At 100% Relative Humidity, the air is "saturated."

The temperature at which the air is saturated and can no longer hold additional moisture is called the dew point temperature. Whenever air temperature drops below its dew point, excess moisture will be released in the form of condensation. Condensation problems are most likely to occur in climates where temperatures frequently dip to 35°F or colder over an extended period of time.

Steel Buildings Are Economical

A steel building is an economical choice and will save you money in construction costs. We make it easy for you to design the building that's just right for you. We have implemented years of steel building design and engineering experience into our system, and you can be confident in your design requirements without worries. The "design it yourself" concept was designed to reduce costs. When you design your own steel building, we use the information you submit online to detail your steel building, just as you designed it. You can design endless steel building combinations without anyone trying to sell you a thing or make a commission. Take all the time you need, making changes to your building configurations are a snap. And of course, we are here to help you, when and if you need it. You can speak to a customer service representative, designer, engineer or project administrator at your convenience. We have no commissioned sales personnel, just experienced steel building professionals waiting to serve you.

Recommended Installation Methods of Insulation

Roof insulation rolls are cut to lengths that will cover the distance from eave to eave, leaving a one-foot overhang on each side of the building.

1) Start at the end of the building and temporarily secure one end of the roll by attaching the insulation to the eave strut with double-faced tape.

2) Pull the insulation across the purlins with the vapor barrier toward the building interior. Double-faced tape attached to the opposite end of the insulation will keep tension on the roof roll while the metal panels are being attached over the insulation.

3) Install the next roll in the same manner, making sure the rolls are stretched tight, aligned properly and closely butted.

4) Fasten tabs using one of the methods described on the following page. Any rips or tears must be covered with matching facing tape to ensure a tight vapor seal.

5) Trim excess insulation flush to prevent it from acting as a wick and moving water into the building.