Selecting the right glass
Updated: Nov 16, 2021
The advantages of selecting the proper glass are not always obvious and are sometimes not considered. Understanding the impact of glass performance on your building, its inhabitants, and the environment is crucial when it comes to saving expenses and making the best decisions for your project.
The effect of glass quality
Glass is a vital aspect in building design, with over 40% of a building’s warmth lost and 87 percent gained through windows alone. The better the thermal performance of your windows, the better the building's internal temperatures will be regulated naturally. The higher the light transmission, the more natural light may penetrate the structure.
The temperature, elevation, surroundings, and building requirements all influence which glass type is best for reducing glare and heat gain, insulating, letting in natural light, or a mix of these.
Glass performance has a wide range of effects, including:
Benefits to the environment — reduce greenhouse gas emissions by lowering the amount of energy necessary to artificially cool, heat, or light a building.
Financial advantages — you will save money on your electricity bill.
Benefits to health — less artificial lighting and temperature management means a building's overall health and well-being is improved.
To keep buildings naturally cooler in cooling dominated and mixed climates where summer temperatures can rise, a glass that blocks a considerable percentage of the solar heat is recommended.
When the sun is high in the sky and at its warmest, a glass that reduces heat gain guarantees that air-conditioning systems don't have to work as hard to keep temperatures bearable. Look for a low Solar Heat Gain Coefficient (SHGC).
A glass that can harness the winter sun and re-radiate escaping heat back into the room helps preserve thermal comfort without the use of excessive artificial heating in heating-oriented regions and mixed climates with colder winters.
A glass that allows the sun to flow through and keeps it circulating long after it has passed is advised when the sun is lower in the sky and a welcome source of heat. Look for a low U-Value figure which indicates more effective insulation
In summer and winter, the way the sun rises and sets has a different effect on the various window orientations. Simply said, the amount of direct sunlight that reaches the windows during the day and seasons has an impact on passive heating and cooling.
As a result, when choosing the suitable glass and determining the necessity for shading devices, the height of the building and the orientation of the windows are important factors to consider.
For your windows, consider the "good, better, best" situation.
A single glazed low-E coated glass like LoE-i89 would be a fantastic starting point for your windows. For windows that receive a lot of sunlight, we propose a double glazed IGU, such as our EnerSave line, with clear and clear on both sides or grey on one side to block the sun even more, however this will reduce visibility.
For insulating properties and solar management, most buildings should consider a double glazed IGU with a low-E coating on surface 2 or 3.
A low-E coating like LoE-366 on surface 2 and a room side coating like LoE-i89 on surface 4 is the ultimate double glazed Low-E combo.
For a comparison, see the related goods below and download Glass Performance Chart.
Bird Friendly Glass
Bird friendly glass can be created during manufacturing or post-production to help birds in flight see the glass ahead. This also helps businesses and families avoid the glass on their property being damaged. Bird friendly glass is strategically designed to be more visible by incorporating lines, dots, or other visible patterns into the glass using glass printing techniques. Research shows that the most effective way of protecting birds is by using lines spaced two inches apart for horizontal rows or four inches apart for vertical rows. When printed correctly, bird-friendly glass is not visible to the human eye but is extremely visible to birds across North America.
Types of Coated Glass
Low-E: Blocks solar radiation to reduce cooling costs. Higher-performing glasses are applied or produced by a magnetron sputtered vacuum deposition (or MSVD) soft coat process.
Passive Low-E: Transmits solar radiation for passive heating applications. Reduces heating costs. Applied on products by a pyrolytic or MSVD soft coat process.
Commercial - Almost always on second
You want to find an efficient way of cooling the building by reducing the heat.
Laminated glass provides durability, high-performance and multi-functional benefits such as safety, security, sound control, solar energy performance and ultraviolet screening, while at the same time preserving the aesthetic appearance of the glass.
Learn more here: Laminated Glass
How HPG helps you select the right Glass:
By combining years of experience with state-of-the-art equipment and knowledgeable staff, HPG meets the most demanding expectations of strength, energy efficiency and aesthetic quality.
We are a member of IGMAC/IGMA and therefore can offer our customers products which will meet or exceed their glass specification needs.
We deliver results for commercial and residential architectural projects, both new construction and restorations, from small to large projects. HPG understands that for any successful project, turnaround time, quality, and exceptional customer service, will bring the projects to a successful completion.
At High Performance Glazing Inc. we are committed to consistently delivering the highest level of quality products, quick turnaround times and customer service.
Whether single silver low-e, double silver, or even triple silver low e, there’s big temperature difference on surface #4. For convenient requirement, it’s suggested to place coating on surface #2 to reduce the heat radiation.
The reasons for the SC and temperature difference is:
If place coating on surface #2, most near infrared radiation are reflected and reduce the direct radiation transmittance. The inner surface #2 of the outer piece glass has much lower than surface #1, so the outward radiation is higher than inward radiation causing lower radiation and thermal passed to the insulated glass space and the 2nd piece glass, thus the SC value and surface #4 temperature is much lower.
Under the same lighting condition, the light transmittance are same for these 2 glass but the 2nd thermal transmission are different caused the difference.
As we know most low-e coating reflect color are usually light grey, blue, and silver color, while the back side of the low-e coating are quite different, especially some double silver low-e will have red or purple colors even if the front color is blue, so if we place the coating on surface 3, the reflect the color will be much different, in addition to the interfere of the 1st piece glass reflect, the color will varies.
There is a significant temperature differential on surface #4, whether it is single silver low e, double silver, or even triple silver low e. On decrease heat radiation, it is recommended that a coating be applied to surface #2 for convenience.
The explanation for the difference in SC and temperature is that when a coating is applied to surface #2, the majority of near-infrared light is reflected, reducing direct radiation transmission.
Because the outward radiation is larger than the inward radiation on the inner surface #2 of the outer piece glass, the radiation and heat passed to the insulated glass space and the 2nd piece glass is lower, resulting in a lower SC value and surface #4 temperatures.
The light transmittance of these two glasses is the same under the same illumination conditions, but the second thermal transmission is different due to the change.
As we all know, most low-e coating reflect colours are light grey, blue, and silver, but the back side of the low e coating is quite different, especially some double silver low-e will have red or purple colours even if the front colour is blue, so if we place the coating on surface 3, the reflect colour will be much different, in addition to the interfere of the 1st piece glass reflect.