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Homebuilding experts and top consumer magazines rank Therma-Tru among the best entry door brands for quality, beauty and energy efficiency.

We’re proud to offer doors that our customers love — and that are respected in the building industry.

About Therma-Tru Doors

A History of Innovation

It was a bold innovation for the home-building market when we introduced an entryway door that looked as beautiful as wood and was more durable. At Therma-Tru, we have been revolutionizing the industry from the start—a spirit you can continue to expect from the leading entry door brand most preferred by building professionals.


Our legacy of innovation continues with an investment in our new Innovation Center, which opened in early 2018. Located in Monclova, Ohio, just minutes from our corporate headquarters, the Innovation Center is a 30,000-square-foot facility that houses our Research and Development and Product Management teams.

We are the nation's leading manufacturer of fiberglass and steel exterior door systems, and we are the most preferred brand of entry doors among building professionals.* Our attention to detail in styling, including our glass innovations, have brought improved curb appeal and value to our customers' homes, and the security and durability features built into every Therma-Tru door brings home comfort and security.


As we’ve expanded our product offerings, we’ve also joined additional communities. Today our corporate headquarters is just outside of Toledo in Maumee, Ohio, and our new Innovation Center is in Monclova, Ohio. We have two manufacturing facilities: One in Butler, Indiana, and one in Matamoros, Mexico. Fypon has manufacturing locations in Yantai, China, and Matamoros, Mexico. Our vast selection of products is available throughout North America.

We are committed to advancing the industry with quality products that hinge on performance and open the door to style and comfort.


Frequently Asked Questions

Why choose Therma-Tru for Entry Doors?
  • More than five decades of proven business track record
  • The Therma-Tru is the brand used by most building professionals for more than 20+years.
  • The Complete Door System is tailored to work seamlessly at the most critical points.
  • The most comprehensive lifetime limited warranty a door company can offer.
  • Thousands of Door Designs for any type of architectural style
  • Wide assortment of handcrafted glass designs to complement contemporary home design trends.
  • Interactive tools are provided to help - customers visualize the ideal door for their homes.
  • Award-winning designs
What are the tools needed to install replacement entry doors?
  • Cut Resistant Gloves
  • Safety Glasses
  • Pry Bar
  • Hammer
  • Reciprocating Saw
  • Power Drill and 1/8-inch drill bit
  • 2-foot and a 6-foot level
  • Measuring tape
  • Framing Square
  • Caulking gun and elastomeric caulk
  • Seal Pan
  • A number 2 and number 3 Phillips bit
  • Shims
  • Sight Pack
  • Number 8x1/2-inch exterior grade screws
  • Putty Knife
How do I install a Therma-Tru entry or patio door system?

Step 1. Prepare to remove the exterior – with the blade pointing away from you use a utility knife to score along the line between the trim and the siding. This will help prevent damage to the siding, do this on the sides of the door.

Step 2. Remove the exterior and interior trim – starting from the bottom where the door inserts a small pry bar between the edge of the trim and jamb and carefully ease the trim away work up to them until the trim is loose. Do this to both sides and the top of the unit is removed. Remove the interior trim in the same way.

Step 3. Remove door slab from the frame – remove the hinge pins from the hinges. After the pins are removed lift the door slab away from the framing and set it aside.

Step 4. Cut Fasteners – to locate the existing fasteners run a putty knife between the existing jamb and the wall studs. as each fastener is located, use a reciprocating saw to cut through them until all fasteners have been cut.

Step 5. Remove the original jamb from the opening – from the inside carefully push the jamb towards the exterior until it comes free of the opening.

Step 6. Check the rough opening – check the subflooring to ensure that it is level. Also, check the rough opening to be sure it is square and plumb. Make any adjustments as needed.

Step 7. Caulk the subfloor and install both ends of sill the pan – on the subfloor opening with three large beads of elastomeric caulk along the entire width of the opening. Place each end of the seal pan on the beads of the caulk and press tightly against the sides of the opening.

Step 8. Install the center of the sill pan – liberally coat the overlap and recessed areas of the end pieces with the PVC cement provided. Place the center section of seal pan and position and hold it long enough to ensure a good bond. To prevent air infiltration run a bead of caulk along the lower interior edge of the seal pan.

Step 9. Remove the check plug or transport clip – if the unit is equipped with a screw-type check plug for transportation remove the screw portion from the exterior of the jamb. If the unit is equipped with a transport clip remove the clip from the door only after the unit has been secured.

Step 10. Caulk along the brickmould – apply caulk to the back of the brickmould around the entire perimeter of the unit 5/8-inch bead of elastomeric caulk is essential.

Step 11. Place the unit in the opening – lift the unit with the top away from the opening center unit and place the seal down into the seal pan as the unit is tilted in.

Step 12. Temporarily secure the unit in the opening – mark the jam face near the door edges on both sides of the door. Pre-drill 1/8-inch hole at these locations for screw placement. A countersunk hole will help you conceal the screw heads. Install number 8x21/2-inch exterior grade screw only in the center hole of both jambs to temporarily secure the unit. Do not drive the screws completely in at this time.

Step 13. Plumb the hinge-side jamb – use a 6-foot level plumb the hinge-side jamb both right to left and inside to outside. Place the number 8x21/2-inch exterior grade screw at each remaining hinge location do not drive the screws in completely at this time.

Step 14. Shim and secure the hinge-side jamb – leave the door closed, shim the above screws behind each location between the opening and the jamb. Use the six-foot level and recheck the hinge jamb to ensure it is plumb and straight. Finish driving the screws in tightly starting in the middle first then the top and the bottom last.

Step 15. Check the weatherstrip contact – from the exterior check the margin and the weatherstrip contact make any frame adjustments to ensure that the weatherstrip contacts the door surface equally at the top the middle and the bottom.

Step 16. Install the long hinge screws – in the top hinge drill eight-inch pilot holes into the two screw hole locations closest to the weatherstrip then install the number 10x21/2-inch screws into the stud to anchor the door frame and to prevent sagging.

Step 17. Adjust the sill – check the adjustable sill by performing the dollar build test. When the sill is properly adjusted it should be snug and slightly difficult to pull a dollar bill out when the door is fully closed, adjust the saddle screws if necessary.

Step 18. Trim the weatherstrip – inspect the weatherstrip length and trim if it is not flushed with the top of the seal saddle.

Step 19. Install the corner pads – apply a bead of elastomeric caulk at the joints where the seal saddle meets the door jambs. And install the corner seal pads.

Step 20. Weatherproof the exterior of the door unit – it is important to apply caulk around the exterior of the unit. Areas that need to be caulk include the seal to the subfloor, the seal to the jamb joints, any exterior trim to the jambs, and any trim to the siding.

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