A drop sill is a smart solution to block draughts and noise at doors. One such solution is an integrated strip placed invisibly in the bottom of a door. As soon as the door closes, the sill automatically lowers. The sill thus closes the gap between door and floor.

How does a drop sill work?

A sill consists of an additional aluminium strip at the bottom of the door. It contains a spring mechanism with a sealing strip made of rubber or silicone. As soon as the door closes, a small pin presses against the frame. This causes the strip to slide downwards. This seals the gap between the door and the floor.

When the door is opened, the strip automatically springs back into the profile. This keeps the door moving freely and prevents the seal from dragging on the floor.

The advantages of a drop sill

A drop sill completely closes the gap on doors as soon as they close. This increases comfort in the home. Draughts and cold do not have the chance to migrate to another room. As a result, the temperature remains more stable. This helps with home insulation.

A sill is completely concealed in the aluminium profile, preserving the door's sleek design. When opening, the sill automatically springs up, allowing the door to move across the floor without touching it. As the system works automatically, ease of use is optimal.

When is a drop sill used?

A drop sill is useful in places where you want to control the temperature in the house room by room. Think, for example, of a hallway that often feels colder than the living room. Without a seal under the door, the cold draws directly into the living room. By closing this gap at the bottom, you prevent this heat loss and the temperature in the living room remains more stable.

Also at aluminium doors of a bedroom or study, it is a practical addition. This is because a drop sill not only stops draughts but also subtly dampens noise from other rooms.

Because aluminium doors are lightweight and turn smoothly, you won't notice the sill while opening and closing the door. A sill is an effective solution in rooms where peace and quiet and a pleasant climate are important.

This is how a drop sill is used

A door should always fit properly to prevent heat loss. Many doors often leave a small gap open at the bottom to prevent friction. However, that gap, among other things, causes heat loss.

A lintel prevents the door from dragging: the strip only lowers as soon as the door closes, leaving no permanent gap. This keeps a aluminium door of Aluwdoors opens and closes smoothly while still completely sealing the door. So you won't be bothered by draughts either.

Installation and maintenance of a drop sill

A drop sill is adjusted so that the strip connects smoothly and completely to the floor. The system is designed to be durable and last as long as the door itself. Maintenance on lintels is minimal. Keep the rubber seal clean by occasionally removing dust and dirt with a cloth.

Alternatives to a drop sill

The drop sill is often used in situations where you want to completely close off a space. This can also be done with thresholds, but these are more difficult to install. A sill is then a better solution. Think of a meeting room, where you want to block drafts and noise.

Want to know which option is most suitable in your situation? Drop by one of our showrooms. These are located in Nunspeet, Veghel, Mijdrecht or Barendrecht. Otherwise, take direct contact us on for personal advice.