Therma-Tru Doors is a leading manufacturer of fiberglass and steel exterior door systems. The company invented fiberglass doors and is continually developing new, high-performance products designed to meet today’s construction trends.


Therma-Tru Doors are Tough and Beautiful

Therma-Tru fiberglass doors look as beautiful as wood but have the strength and durability of steel. The doors are the ultimate combination of energy efficiency, performance, security, and aesthetics. They are low maintenance doors that resist dents and scratches and are available in lots of designs. Therma-Tru’s lines of steel doors deliver affordable style options for entryways, patios, and more. Whether you choose a fiberglass or steel door, you can rest assured that with Therma-Tru, you will have a reliable door that will last for years.


Long Island and New England’s Riverhead Building Supply is the best place to shop for Therma-Tru doors, including:

  • Fiberglass and steel entry door systems
  • French and sliding patio door systems
  • Multi-family door systems including fire-rated entry doors and noise reduction doors