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Frequently Asked Questions

Will MI Windows and Doors contact me if my package was damaged during the shipping process?

If we receive notification from Federal Express for a damaged shipment, MIWD will place another order for the damaged package.  If you have not received your replacement package, please email us at

Why do I have condensation on my windows?

Windows do not cause condensation, but excessive humidity levels can.  Condensation is a visible evidence of excessive moisture in the air.  For more information on condensation, please visit our Product Care page or visit AAMA's website.

What is the difference between tempered and laminated glass?

Laminated Glass

Two or more panes of glass are bonded together by a durable plastic interlayer with a resin called PVB (polyvinyl butyral). This technique is used to create single sheets of glass with multiple layers. The PVB keeps the glass from breaking apart easily and provides high sound insulation. However, if it should break, the glass will tend to remain in its frame, minimizing the risk of injury from sharp edges and flying or falling glass particles.

Tempered Glass

Tempered glass is often referred to as safety glass because it is more resistant to breakage than normal float glass. Yet if it is broken, it usually breaks into relatively small pieces, which are less likely to cause serious injury. Tempered glass is known to be several times stronger than laminated glass. Tempered glass is created using chemical and thermal treatments.

More information from Guardian Glass

What is STC?

Sound Transmission Class is a single-number system used to rate the airborne sound transmission performance of a window, wall, panel, ceiling, etc. The higher the STC number, the better the product's ability to block sound transmission.