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Frequently asked questions

What is low-E glass?

On which surface would you recommend applying a ‘Low-E’ coating to achieve the best solar performance?

What is the difference between heat-strengthened and fully tempered glass?

What are the important values to consider when specifying glass for my project?

What is the difference between U-value and R-value?

Should I use an argon- or an air-filled IG unit?

What is the difference between solar factor and shading coefficient?

How do I order samples of your glass?

Is laminated glass available from Guardian?

What is a strain pattern?

Does Guardian supply spandrel glass? How do I get my spandrel glass and vision glass to match in appearance?

Does Guardian produce fire-rated glass?

What is roller wave distortion?