How to Install an Exterior Door
Time Required: Over 1 day
By learning how to install an exterior door, you effectively update one of the key features of your home’s appearance. This guide reviews how to install an entry door, including how to remove the old door, position the new one and update such hardware as the hinges and door knob.
Exterior doors are the most prominent feature of a home's curb appeal. As a DIY project, installing a new door can make a huge impact for a small investment.
The first step you need to accomplish before you learn how to install an exterior door is that you must prepare the rough opening of the door, if necessary, and remove the new door and frame from their packaging.
- Leave the retaining brackets in place that hold the door closed while you’re working on it.
- Measure both the door and rough opening to make sure the door is the right size.
Tip: Installing an exterior door that is insulated and made of steel can be heavy and cumbersome due to the weight of the materials. If you choose to install an exterior door made of steel, you will need a helper. Certain wood front doors will also be heavier than others, so take that into consideration before starting this project.
- Center the door and frame in the rough opening as a test-fit.
- Use a level to make sure the door is plumb.
- If necessary, shim under the lower side jamb until the door is plumb.
- Adjust as necessary to keep the door jambs square with each other.
- Double check to make sure the door is centered.
- Trace the outline of the moulding onto the siding.
- If you have vinyl or metal siding, be sure to enlarge the outline to make room for the extra trim required.
- Remove the door and frame after finishing the outline.
- Cut along the outline down to the sheathing.
- With your safety glasses on, start the cut with the blade clear of the siding, and then lower the moving blade into it.
- Stop just short of the corners to prevent damaging the siding that will remain.
- Finish the corners with a sharp wood chisel.
- Cut a piece of the drip edge to fit the width of the rough opening.
- To provide a moisture barrier, apply building paper to the exposed areas of the walls and door frame.
- Cut the drip edge to fit the width of the rough opening and slide it underneath the siding at the top of the opening.
- Do not nail the drip edge.
- Check the fit before installing a new door, and enlarge the opening as necessary.
- Once you are satisfied with the fit of the door, remove it and apply several thick beads of silicone caulk to the bottom of the doorsill.
- Caulk underneath the spots where the bottom of the jamb and brick moulding will be.
- Check that the door jamb on the hinge side is plumb and shim as necessary.
- Temporarily screw the hinge jamb in place by driving two #8 3-inch drywall screws through it: One about 2 inches above the top hinge and the other about 2 inches from the center hinge.
- Loosen the screws if necessary to bring the jamb back into plumb.
- Cut pairs of wedge-shaped cedar shims together to form flat shims.
- Using another entrance, go inside and insert them into the gaps behind the hinges and between the jamb and framing to stabilize the jamb.
- Cedar shims are preferable to pine because they are more weather-resistant.
- Remove two of the screws on the top hinge and replace with long anchor screws. These anchor screws will penetrate the framing members to strengthen the installation.
- Do not use longer screws than the manufacturer calls for on doors with sidelights — the screws might break the glass.
- Apply paintable caulk and insulate around the entire door frame.
- Fill all nail holes with caulk and insulate with weather stripping where applicable.
- Finish the door as directed by the manufacturer.
- Adjust the threshold for a tight seal (as long as it is adjustable) as directed by the manufacturer.
Tip: If you set the threshold too high, it will make the door difficult to open and eventually could damage either the door or the weather stripping.
- Install a new door lock and door knob by inserting the latch through the hole for the new parts.
- Insert the lockset tailpieces through the latch bolt, and screw the handles together by tightening the retaining screws.
- Avoid damage to the screws by using a hand screwdriver.
- Complete the installation by attaching the strike plate to the door jamb to fit the latch bolt.