Words cannot describe how pleased we are with the performance of our Fibertec triple glazed casement and picture windows. Since installation we have gone through two brutal winters, heavy rains, scary winds and even a driving hailstorm with pellets the size of buckshot. We are amazed with the thermal performance including the desired solar gain during the winter. When it's cold outside the inside glass is warm to the touch even on the north face. This allows for a higher, more comfortable indoor humidity during the winter without condensation or frost like a typical window. There are no cold and drafty areas near any window. Sound transmission is nearly nonexistent...they even hush noisy crickets.
From a builder's perspective of almost 30 years in the residential trade, the fiberglass construction and the soft spacers are key to the performance. Over the years I have used numerous brands of windows. They were either wood, vinyl, aluminum, vinyl clad or aluminum clad. We even installed some composite materials more recently. Fiberglass is so thermally stable in comparison and it obviously can't rot like wood nor does it get brittle with age and temperature like vinyl. It doesn't need any maintenance or painting/staining inside or out, a labor intensive, costly task often overlooked. The soft spacers don't make the perimeter of the window cold from conductance like the dated aluminum edge banding still used by most window companies.
Ordering was easy and friendly. The knowledgable salesman recommended options based on our conversation. He had excellent foresight and wasn't condescending like a lumberyard employee. The custom order was processed on schedule and every unit fit perfectly. Thank you.