Garage Doors decision guide
Reviewed and updated September 24, 2026
Light at the sides or top calls for a perimeter-seal and door-fit check, not automatically a bottom-seal replacement. DASMA distinguishes header seals, jamb seals and stop moulding from bottom weatherseal. These parts address different edges of the opening.
With the door closed and controls left alone, photograph whether the light forms a continuous line, appears at one corner, or differs between the two sides. Give that pattern, the door model, and any recent seal or track work to a trained door professional, and ask them to compare the perimeter seal with the door’s fit before naming a replacement part.
Light at a side or across the top points the next inspection toward that edge of the opening. It does not automatically mean the bottom weatherseal should be replaced. Industry terminology distinguishes header seals, jamb seals, stop moulding, and bottom weatherseal because they serve different edges.
With the door fully closed and controls left alone, photograph the visible light from inside. Record whether the gap is continuous, concentrated at a corner, or different from one side to the other. Do not place hands near moving sections or attempt to bend track, alter spring tension, or force the door into the opening.
Ask a door professional to compare the perimeter seal with the door's fit and the exact construction of the opening. Describe the affected edge rather than ordering a generic seal by name. The terminology source does not establish that every door uses the same seal design or that the visible gap identifies one failed component.
Notice next: Use the completed record to request the exact review described below.
Prepare a factual record before asking for a product-specific or property-specific decision.
The record narrows the decision; it does not prove a diagnosis, approval, price, or scope.
No. Identify whether light enters at a side, header, corner, or bottom.
Photograph the closed door's exact light pattern from outside its travel path.
Ask for a perimeter-seal and door-fit check for the actual opening.
This decision guide does not inspect or approve the installed product or service.
Current product instructions, provider terms, property rules, and local requirements still control.
A ZIP code does not prove compatibility, jurisdiction, price, availability, or job acceptance.
Terminology does not prove which seal or fit condition needs correction.
This page does not inspect the installed system or make a remote diagnosis.
No local result, price, provider availability, offer, phone, or routing claim is made.