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

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

 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.

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 8×2^1/2-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.

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 8×21/2-inch exterior grade screw at each remaining hinge location do not drive the screws in completely at this time.

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.

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.

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 10×2^1/2-inch screws into the stud to anchor the door frame and to prevent sagging.

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.

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

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.

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.