Glazing Materials 

Glazing materials are used to maximize heat gain while minimizing heat loss. Commercial greenhouses use special plastics capable of withstanding UV degradation, but more durable materials are popular with home owners who value efficiency, longevity and appearance more than cost. Methods of mounting, cost, transmittance, reflectance, conductance, durability, longevity, appearance, and workability are factors to consider when choosing a glazing material.

Covering

Advantages

Disadvantages

Light Transmission

"U" Factor

Insulating Value "R"

Estimated Lifetime

Cost per Sq./Ft.**

Single Polyethylene Film

Inexpensive

Easy to install

Short life

85 %

1.2

.83

1 year

$.06

Double Polyethylene Film

Inexpensive

Saves on heating costs

Easy to install

Short life

77%

.70

1.43

1 year

$.12

Corrugated Polycarbonate

High transmittance

High impact resistance

 

Scratches easily

91%

1.2

.83

15 plus years

10 year warranty

$1.00

Glass Double Strength

High transmittance

High UV resistance

Resists scratching

 

High cost

Difficult installation

Low impact resistance

High maintenance

88%

1.1

.91

25 plus years

$2.00

Glass Insulated

High transmittance

High UV resistance

Resists scratching

Very high cost

Difficult installation

Low impact resistance

78%

.70

1.43

25 plus years

$5.00

8mm Twin Wall Polycarbonate

High impact resistance

Saves on heating costs

Requires glazing system to install

Scratches easily

82%

.62

1.61

15 plus years

10 year warranty

$1.50

16 mm Double Wall Polycarbonate

High impact resistance

Saves on heating costs

Requires glazing system to install

Scratches easily

81%

.55

1.82

15 plus years

10 year warranty

$3.10

16 mm Triple Wall Polycarbonate

High impact resistance

Saves on heating costs

Requires glazing system to install

Scratches easily

81%

.42

2.38

15 plus years

10 year warranty

$3.10

 

CONTACT

 

HERE ARE A FEW LINKS TO GET YOU STARTED

http://www.uark.edu/~mrevans/4703/learning_units/unit_03/unit_03_printable.html

http://www.patent-glazing.com/glass%20solar%20control%20intro.htm

http://attra.org/attra-pub/solar-gh.html#glazing

http://www.solar-components.com/default.htm