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Patio Doors Help & Information

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glossary section 'N' glossary section 'O' glossary section 'P' glossary section 'Q' glossary section 'R' glossary section 'S' glossary section 'T' glossary section 'U' glossary section 'V' glossary section 'W' glossary section 'X' glossary section 'Y' glossary section 'Z'

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AAMA: American Architectural Manufacturers Association.  A national trade association that establishes voluntary standards for the window, door, storefront, curtain wall and skylight industries.

Absorptance: The ratio of radiant energy absorbed to total incident radiant energy in a glazing system.

Acrylic: A thermoplastic with good weather resistance, shatter resistance, and optical clarity, used for glazing.

Active: In paired or double doors, the hinged door leaf that is primarily operated.

Aerogel: A microporous, transparent silicate foam used as a glazing cavity fill material, offering possible U-values below 0.10 BTU/(h-sq ft-° F) or 0.56 W/(sq m-& C)

Air Infiltration: Air passing through a door system when the door is under pressure, usually from wind.

Air Leakage Rating: A measure of the rate of air-leakage around a window, door, or skylight in the presence of a specific pressure difference. It is expressed in units of cubic feet per minute per square foot of frame area (cfm/sq ft). Formerly expressed as cubic feet per minute per foot of window perimeter length (cfm/ft) but not now in use. The lower a window's air-leakage rate, the better its air tightness.

Annealed Glass:  Regular glass which has not been heat strengthened or tempered.

ANSI: American National Standards Institute. Clearing house for all types of standards and specification.

Architectural Style: The characteristic form and detail of buildings from a particular historical period or school of architecture. Some examples include Colonial, Contemporary, Craftsman, Old World, Victorian, or Cottage.

Argon Gas:  An inert, nontoxic gas used in insulating glass units to reduce heat transfer.

ASHRAE: American Society for Testing and Materials. Organization that sets standards for testing of materials.

ASTM: American Society for Testing and Materials. ( http://www.astm.org/index.html ) A voluntary organization concerned with development of consensus standards, testing procedures and specifications.

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BOCA: Building Officials and Code Administrators.

BTU:  Abbreviation for British Thermal Unit, the heat required to increase the temperature of one pound of water one degree Fahrenheit.

Butyl: A rubber material that seals the glass to the spacer, creating an airtight and water tight insulated glass unit.

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Casing: Exposed molding or framing around a window or door, on either the inside or outside, to cover the space between the frame or jamb and the wall.

Caulking: a mastic compound for filling joints and sealing cracks to prevent leakage of water and air, commonly made of silicone, bituminous, acrylic, or rubber-based material.

CFM: Cubit feet per minute.

ClarityOne Glass: A chemical treatment that when applied to glass, helps to create a smoother surface that won't attract or hold dirt and dust. Established b PPG industries.

ClimaTech®: The brand name for teh insulated glass unit that is present in Alside's insulting glass package. A ClimaTech unit will containe eitehr two or three panes of glass, with one or two of those panes being a Low-E surface. It will utilize the SST warm edge spacer system and contain either argon or krypton gas.

Composite Frame: A frame consisting of two or more materials, for example, an interior wood element with an exterior fiberglass element.

Condensation: The deposit of water vapor from the air on any cold surface whose temperature is below the dew point, such as a cold window glass or frame that is exposed to humid air.

Conduction: Heat transfer through a solid material by contact of one molecule to the next. Heat flows from a higher-temperature to a lower temperature one.

Convection: A heat transfer process involving motion in a fluid (such as air) caused by the difference in density of the fluid and the action of gravity.  Convection affects heat transfer from teh glass surface to room air, and between two panes of glass.

CRF:  Condensation Resistance Factor.  An indication of a window's ability to resist condensation. The higher teh CRF, the less likely condensation is to occur.

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Degree Day: A unit that represent a one-degree Fahrenheit deviation from some fixed reference point (usually 65° F) in the mean, daily outdoor temperature. See also heating degree day.

Desiccant: An extremely porous crystalline substance used to absorb moisture from within the sealed air space of an insulating glass unit.

Dewpoint: The temperature at which water vapor in air will condense at a given state of humidity and pressure.

Double Glazing:  In general, two thicknesses of glass separated by an air space within an opening to improve insulation against heat transfer and/or sound transmission. In factory-made double glazing units, the air between the glass sheets is thoroughly dried and the space is sealed airtight, eliminating possible condensation and providing superior insulating properties.

Double-strength Glass: Sheet glass between 0.115" and 0.133" (2.92-3.39 mm) thick.

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Edge Effects: Two-dimensional heat transfer at the edge of a glazing unit due to the thermal properties of spacers and sealants.

Electromagnetic Spectrum: Glazing with optical properties that can be varied continuously from clear to dark with a low-voltage signal. Ions are reversibly injected or removed from an electrochromic material, causing the optical density to change.

Electromagnetic Spectrum:  Radiant energy over a broad range of wavelengths. 

Emittance: The ratio of the radiant flux emitted by a specimen to that emitted by a blackbody at the same temperature and under the same conditions.

ENERGY STAR®: The ENERGY STAR program is a joint venture between the US Environmental Protection Agency (EPA) and the US Department of Energy (DOE) designed to encourage homeowners to purchase energy-efficient products. Using less energy in our homes reduces the amount of CO2 emissions released into the atmosphere from burning fossil fuels such as coal, oil and natural gas. The advanced components and design in the ClimaTech insulated glass packages exceed all performance criteria required by the ENERGY STAR program.

Evacuated Glazing: Insulating glazing composed of two glass layers, hermetically sealed at the edges, with a vacuum between to eliminate convection and conduction. A spacer system is needed to keep the panes from touching.

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Fenestration: An architectural term for the placement of window, skylight and door openings in a building wall, one of the important elements in controlling the exterior appearance. Also a window, door or skylight and it's associated interior or exterior elements, such as shades or blinds. 

Fixed Panel: An inoperable panel of a sliding glass door or slider window.

Fogging: A deposit of contamination left on the inside surface of a sealed insulating glass unit due to extremes of temperature or failed seals.

French Patio Doors: A two-panel glass door where both panels operate and swing either inward or outward.

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Gas Fill: A gas other than air, usually argon of krypton, placed between window or skylight glazing panes to reduce the U-factor by suppressing conduction and convection.

Glass:  An inorganic transparent material composed of silica (sand), soda (sodium carbonate), and lime (calcium carbonate) with small quantities of alumina, boric, or magnesia oxides.

Glazing: The glass or plastic panes in a window, door or skylight.

Glazing Bead: A molding or stop around the inside of a window frame to hold the glass in place.

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Head Track: The track provided at the head of a sliding glass door. Also, the head member incorporating the track.

Heat-Strengthened Glass: Glass that is reheated, after forming, to just below melting point, and then cooled, forming a compressed surface that increases its strength beyond that of typical annealed glass.

Hinged Patio Doors: A two-panel glass door where one panel is stationary or fixed, while the other operates and swings either inward or outward.

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ICC: International Code Council, A national organization that publishes model codes for adoption by states and other agencies. Codes include the International Building Code (IBC) and the International Energy Conservation Code (IECC).

IECC: International Energy Conservation Code published by the ICC. The successor to the Model Energy Code, which is cited in the 1992 U.S. Energy Policy Act (EPAct) as the baseline for residential Energy Codes in the United States.

Inactive: A term for a door panel fixed in its frame. Inactive door panels are not hinged and are not operable.

Insulating Glass: Two or more pieces of glass spaced apart and hermetically sealed to form a single glazed unit with one or more air spaces between. Also called double glazing.

Interlocker: An upright frame member of a panel in a sliding glass door which engages with a corresponding member in an adjacent panel when the door is closed. Also called interlocking style.

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Jamb: A vertical member at the side of a window frame or the horizontal member at the top of a window frame as in a head jamb.

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Krypton Gas: An inert, non-toxic gas used in insulating windows to reduce heat transfer.

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Laminated Glass: Two or more sheets of glass with an inner layer of transparent plastic to which the glass adheres if broken. Used for safety glazing and sound reduction.

Light-To-Solar-Gain Ratio: A measure of the ability of a glazing to provide light without excessive solar heat gain. It is the ratio between the visible transmittance of a glazing and its solar heat gain coefficient. Abbreviated LSG.

Long-Wave Infrared Radiation: Invisible radiation, beyond red light on the electromagnetic spectrum (above 3.5 micro meters), emitted by warm surfaces such as a body at room temperature radiating to a cold window surface.

Low-Conductance Spacers: An assembly of materials designed to reduce heat transfer at the edge of an insulating window. Spacers are placed between the panes of glass in a double or triple glazed window.

Low E Glass:  (E-emissivity) Microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor (ultra-violet) by suppressing radiative heat flow. A typical type of Low-E coating is transparent to the solar spectrum (visible light and short-wave infrared radiation) and reflective of long-wave infrared radiation.

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Meeting Rail: The part of a sliding glass door, a sliding window or a hung window where two panels meet and create a weather barrier.

Micron: One millionth (10‾6 ) of a metric meter.

Mil.: One thousandth of an inch, or 0.0254 millimeter.

Molded Energy Code (MEC): The Model Energy Code is cited in the 1992 U.S. Energy Policy Act (EPAct) as the baseline for residential Energy Codes in the United States. It has been succeeded by the International Energy Conservation Code (IECC) published by the International Code Council (ICC).

Mylar: A weatherstripping material that is present where the sash frame meets the master-frame.  Adds increased resistance to air infiltration.

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NFRC: Initial for National Fenestration Ratings Council, an industry association which sets standards for testing, rating, and labeling doors and windows with heat transmission and energy information.

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Obscure Glass: Any textured glass (frosted, etched, fluted, ground, etc.) used for privacy, light diffusion, or decorative effects.

Outswing: A door assembly in which the door panel swings outside the building.

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Panel: A major component of a sliding glass door, consisting of a light of glass in a frame installed within the main (or outer) frame of the door. A panel may be sliding or fixed.

Plumb: A position or measurement that is truly and exactly vertical 90° from a level surface.

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R-Value A measure of the resistance of a glazing material or fenestration assembly to heat flow. It is the inverse of the U-factor (R=1/U) and is expressed in units of hr-sq ft-°/BTU. A higher R-value glass has a greater resistance to heat flow and a higher insulating value than one with a low R-value.

Radiation: The transfer of heat in the form of electromagnetic waves from one separate surface to another. Energy from the sun reaches the earth by radiation, and a person's body can lose heat to the cold window or skylight surface in a similar way.

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Safety Glass: A strengthened or reinforced glass that is less subject to breakage or splintering.

Screen: Woven mesh of metal, plastic, or fiberglass stretched over a window or door opening to permit air to pass through, but not insects.

Sealant: A compressible plastic material used to seal any opening or junction of two parts, such as between the glass and a metal sash, commonly made of silicone, butyl tape, or polysulfide.

Shade Screen: A specially fabricated screen of sheet material with small narrow louvers formed in place to intercept solar radiation striking the glass; the louvers are so small that only extremely small insects can pass through. Also called a sunscreen. Also, an awning with fixed louvers of metal or wood.

Shading Coefficient (SC):  A measure of the ability of a glass unit to transmit solar heat, relative to that ability for 1/8-inch clear, double-strength single glass. It is being phased out in favor of the solar heat gain coefficient and is approximately equal to the SHGC multiplied by 1.15. It is expressed as a number without units between 0 and 1. The lower a window's solar heat gain coefficient or shading coefficient, the less solar heat it transmits, and the greater its shading ability.

Short-Wave Infrared Radiation: Invisible radiation, just beyond red light on the electromagnetic spectrum (bewteen0.7 and 2.5 microns), emitted by hot surfaces and included in solar radiation.

Sill: The horizontal, bottom section of the master-frame.

Sill Track: The track provided at the sill of a sliding glass door. Also, the member incorporating such a track.

Simulated Divide Lights: A glass unit that has the appearance of a number of a number of smaller panes of glass separated by muntins, but actually is a larger glazing unit with the muntins placed between or on the surfaces of the glass layers.

Sliding Patio Doors: A combination of fixed and sliding glass door panels that operate solid brass roller trucks, moving horizontally on a track or in grooves. Available in 2-3 or 4 lite configurations with the operable panel available in any position.

Solar Control Coatings: Thin film coatings on glass or plastic that absorb or reflect solar energy, thereby reducing solar gain.

Solar Heat Gain Coefficient (SHGC):  The fraction of solar radiation admitted through a window or skylight, both directly transmitted and absorbed and subsequently released inward. The solar height gain coefficient has replaced the shading coefficient as the standard indicator of the glass's shading ability. It is expressed as a number between 0 and 1. The lower the solar heat gain coefficient, the less solar heat it transmits and the greater its shading ability. SHGC can be expressed in terms of the glass alone or can refer the entire assembly.

Solar Radiation: The total radiant energy from the sun, including ultraviolet and infrared wave lengths as well as visible light.

Solar Screen: A sun shading device, such as screens, panels, louvers, or blinds that are installed to intercept solar radiation.

Solar Spectrum: The intensity variation of sunlight across its spectral range.

Sound Transmission Class (STC): The sound  transmission loss rating of a material over a selected range of sound frequencies. The higher the number, the less sound transmitted.

Spacer: An object placed between two or more pieces of glass which helps to maintain a uniform width between the glass, and prevent sealant distortion.

Spectrally Low-E: Glazing that is transparent to some wavelengths of the solar spectrum and reflective to others. Typical spectrally selective coatings are transparent to visible light and reflect short-wave and long-wave infrared as well as U V radiation. Spectrally selectivity can be achieved with low-E coatings and/or high performance tints.

SST non-metal spacer: A solid silicone foam spacer covered with Mylar. It is sealed to the edge of the glass and then sealed with butyl for greater energy efficiency.

STC: Abbreviation for Sound Transmission Coefficient. A value which describes in relative terms the ability of a door to dampen the passage of noise. Doors with higher STC values permit less noise to pass through.

Stile: The upright or vertical edges of a door, window or screen.

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Tempered Glass: Glass sheet which has been strengthened by heat processing. Tempered Glass when broken, shatters into small pieces without sharp edges. See Safety Glass.

Thermal Expansion: Change in dimension of a material as a result of temperature change.

Thermal Mass: Mass in a building (furnishings or structure) that is used to absorb solar gain during the day and release the heat as the space cools in the evening.

Thermochromics:  Glazing with optical properties that can change in response to temperature changes.

Thermogram: An image of an object taken with an infrared camera that shows surface temperature change.

Thermoplastic Elastomer (TPE):  Abbreviation for thermoplastic elastomer; a class of copolymer or a physical mix of polymers (usually a plastic and rubber) which consist of material with both thermoplastic and elastomeric properties. Generally low modulus, flexible materials that can be stretched repeatedly to at least twice their original length at room temperature with an ability to return to their approximate original length when stress is released. TPEs are used to make weather-stripping and gasketing parts.

Threshold: Another term for sill - the horizontal part of a door assembly, fixed under the door panel and bearing on the floor.

Transmittance: The percentage of radiation that can pass through glazing. Transmittance can be defined for different types of light and energy, e.g., visible light transmittance, UV transmittance, or total solar energy transmittance.

Transom: A framed glass assembly mounted atop a door assembly. Transom are rectangular in shape or have curved or arched tops. One design of a curved top transom has the shape of a half-ellipse.

Triple-Glazed: An insulated glass assembly made of three thicknesses of glass, with air spaces between the outer and inner thickness.

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UBC: Uniform Building Code.

UV (Ultraviolet light): The invisible rays of the spectrum that are outside of the visible spectrum at its short-wavelength violet end. Ultraviolet rays are found in everyday sunlight and can cause fading of paint finishes, carpets and fabrics. 

UV reflection: The percentage of ultraviolet rays being blocked rather than being transmitted through a glass unit. The higher the number, the lower the percentage of ultraviolet rays being transmitted through.

U-Value:  A measure of the rate of non-solar heat loss or gain through a material of assembly. It is expressed in units of BTU/hr-sq ft-°F (W/sq m-°C) Values are normally given for NFRC/ASHRAE winter conditions of 0°F (18°C) outdoor temperature, 70° F(21° C) indoor temperature, 15 mph wind and no solar load. The U-factor may be expressed for the glass alone or the entire assembly, which includes the effect of the frame and spacer materials. The lower the U-Factor, the greater a unit's resistance to heat flow and the better its insulating value.

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Visible Light: The portion of the electromagnetic spectrum that produces light that can be seen. Wavelengths range from 380 to 720 nanometers.

Visible transmittance (VT): The percentage or fraction of the visible spectrum (380 to 720 nanometers) weighted by the sensitivity of the eye that is transmitted through the glazing.

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Warm Edge Technology: The use of low-conductance spacers to reduce heat transfer near the edge of insulated glazing.

Weatherstripping: Material used to form a weather-resistant seal around operable sash.

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Yellow Zinc Dichhromate:

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Diagram of a French Door

french door set up image

For further information or to request a quote, contact us..

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Diagram of a Sliding  Door

sliding door set up image

For further information or to request a quote, contact us..

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About Patio Doors

The sliding glass door was introduced as a significant pre-war International style of architecture in North America and Europe, patterned from the Japanese panel door.

Traditional Patio Doors have two panel sections, one fixed panel and one operable panel, but today you can expand that in multiple configurations.  When people talk about the door 'handing', they are referring to which panel moves, i.e., right handed means the right panel slides left.

Sliding Patio doors offer many options and are a beautiful way to enlarge your view of the outside.

French Doors, used both as exterior or interior doors, are sometimes called casement doors. They are hinged and can swing inward or outward. They traditionally have a molded panel at the bottom of the door.


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Care and Maintenance

All Iossi Door systems and components should be inspected on an annual basis for the following conditions:

  • Looseness
  • Weather-strip seal inadequacies
  • Screen cuts, holes or tears
  • Track functioning/ hardware functioning

General Cleaning: As part of your normal cleaning routine, simply wipe down the glass panels using a mild window cleaner and soft lint-free cloth.  The bottom track should be vacuumed periodically and kept free of debris and dirt to ensure continued ease of use.

General Maintenance:  Swing-out doors should have their hinges checked and lubricated if they are squeaking or sticking. Hardware should periodically be checked and any dirt build up removed. 

Weather-stripping: If the weatherstripping fails to perform (i.e., not sealing the door system properly, cracking, tearing, etc.) the weather-strip needs to be replaced. Remove the existing weatherstripping and replace.

Vinyl Thresholds: If the vinyl threshold fails to perform (i.e., splitting, cracking etc.), the vinyl threshold needs to be replaced. Remove the existing threshold and replace.

Sealing/Resealing Areas: If a caulk seal fails to perform (i.e., water leakage) remove existing seal and reseal areas.

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Our Policy

We put our customers first.


Our Thoughts

We earn our customers trust, it is part of what has kept us a successful business for so many years.  We know the area and we offer products and services that have proven to provide excellent results. 

Contact Us

4374 State Street
Bettendorf, Iowa 52722


Monday-Friday: 8-4
Other times available by appointment