Quick answer: Locate the exterior door gap and distinguish worn weatherstripping from alignment, threshold or water-entry problems. Choose compatible replacement parts that seal while allowing the door to open, close and latch correctly. A gap does not establish a fixed monthly energy loss.
Describe the gap
- Note whether it is at the top, sides or bottom.
- Photograph missing, torn or compressed seals without pulling them out.
- Record rubbing, latching problems, drafts and any water entry separately.
- Find the door model and existing seal profile if accessible.
Match the material to the location
The Building America weatherstripping guide discusses choosing and installing weatherstripping for windows and doors. Check the door manufacturer's requirements as well: one adhesive strip or sweep is not suitable for every groove, sill or door material.
For straightforward replacement on an identified, sound door, follow the compatible product's preparation and installation instructions. Do not stack seals until the door becomes difficult to operate, or assume a fixed number of threshold-screw turns is correct.
Do not seal designed drainage openings
Andersen's glossary distinguishes weatherstripping from weep holes, which allow water drainage. Identify designed drainage and ventilation openings before adding sealant. Water entry may require assessment of the sill, installation or surrounding assembly rather than simply more weatherstripping.
Check alignment and operation
If the door rubs or the latch no longer aligns, address that issue rather than using thicker seals to conceal it. See the door-operation checklist. After approved work, check normal opening, closing, latching and seal contact. Energy savings depend on the home and conditions; this guide does not promise a dollar saving.
Frequently Asked Questions
Should every visible opening be caulked?
No. Identify intended drainage and ventilation openings and follow the door system's instructions.
Can thicker weatherstripping fix a misaligned door?
Not reliably. Establish the cause of poor fit and preserve normal operation rather than forcing the door against added material.
Will a new sweep solve water entering at the sill?
Not necessarily. The source and drainage arrangement need assessment before choosing a repair.
Manufacturer and public-agency sources checked September 22, 2026. This guide supports project planning, not a universal repair or wiring procedure. Follow the exact product instructions and applicable requirements.
Request help with your project
Describe your repair for an initial estimate. Include your ZIP code, model and symptoms. Confirm the assigned professional, qualifications, scope, price and appointment before work begins. Availability depends on project and location. A booking deposit is not the total repair price.
