Exterior Door Installation Guide

Door installation has gotten complicated with all the weatherstripping options, threshold requirements, and security considerations flying around. As someone who has installed exterior doors in every situation, I learned everything there is to know about getting it right. Today, I will share it all with you.

Why Proper Installation Matters

Probably should have led with this section, honestly—proper installation enhances security, improves energy efficiency, and ensures weather resistance.

Preparation

That’s what makes thorough prep endearing to us door installers—it prevents problems:

1. Measure opening height and width
2. Check for level and plumb
3. Remove old door and frame if replacing
4. Inspect rough opening for damage

Materials Needed

• Pre-hung exterior door
• Shims
• Screws and nails
• Weatherstripping and sealant
• Threshold
• Level and tape measure

Installation Steps

1. Apply sealant to subfloor where threshold sits
2. Set door in opening and check fit
3. Insert shims at hinge locations
4. Verify level and plumb
5. Secure hinges with screws
6. Shim and secure latch side
7. Check door operation
8. Install lockset and deadbolt
9. Apply exterior trim and caulk

Weatherproofing

• Install proper weatherstripping around frame
• Ensure threshold creates tight seal
• Apply caulk at exterior trim joints
• Use flashing tape above door

Common Issues

• Door doesn’t close properly: Check plumb and adjust shims
• Air leaks: Add or adjust weatherstripping
• Water infiltration: Check threshold seal and flashing