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A door can look completely closed and still allow unwanted noise and draughts through the gaps around it. Choosing the right seals can make a noticeable difference to comfort and privacy - but the best solution usually involves more than attaching a strip to the bottom of the door.
Fire and smoke protection require even more careful selection. A product that reduces draughts is not automatically a smoke seal, and a seal approved for use on certain fire doors does not turn an ordinary door into a fire-rated assembly.
At Keeler Hardware, we recommend starting with one question: what does this doorway need to achieve?
This guide explains the different types of door seals, how to choose a complete sealing solution, and what to check when acoustic performance, weather protection or building compliance matters.
Start With the Whole Doorway, Not Just the Bottom Gap
For sound reduction and draught control, examine the entire opening: the head at the top, the jambs down both sides, and the gap beneath the door. On double doors, the meeting point between the two leaves also needs attention. A well-sealed bottom edge cannot compensate for gaps elsewhere.
There can also be leakage between the frame and the surrounding wall. These gaps require an appropriate frame-to-wall treatment; fitting a seal between the door leaf and frame will not address them. In a fire-rated installation, that treatment must also suit the approved construction.
Think of door sealing as a continuous system rather than a collection of unrelated strips. The products need to work together while allowing the door to open, close and latch properly.
The Main Types of Door Seals
| Seal type | What it does | What to consider |
|---|---|---|
| Perimeter seal | Seals around the top and sides of the door. Options include flexible fins, compression gaskets and seals in adjustable carriers. | Match the profile, fixing method and working gap to the frame. Adhesive and screw-fixed products have different installation requirements. |
| Automatic drop seal | Lowers a sealing gasket when the door closes and retracts it as the door opens. | Available in concealed and surface-mounted designs. Check the available space, operating gap and permitted cut-back. |
| Fixed sweep or brush seal | Covers the bottom gap for applications such as draught or dust control. | Choose the particular product for the required duty. Do not assume that a brush or rubber strip has tested acoustic, fire or smoke performance. |
| Threshold plate | Provides a suitable surface for a bottom seal to close against. | A plate does not seal the opening by itself. Its profile needs to suit the seal, floor and doorway. |
| Meeting-stile seal | Treats the junction between the leaves of a double door. | Double doors need a coordinated arrangement across the perimeter, bottom edges and meeting stiles. |
Despite the name, an automatic drop seal does not mean a seal intended only for an automatically opening door. Many operate mechanically: a small actuator contacts the frame as the door closes, lowering the gasket without electricity. Correctly adjusted, the gasket retracts when the door opens instead of continually dragging across the floor.
Using Door Seals for Soundproofing
Seal the air paths first
For doorways, "soundproofing" is usually better understood as reducing sound transmission, rather than eliminating every sound.
Gaps around a door provide paths for airborne noise. An acoustic sealing arrangement normally addresses all four sides, combining suitable perimeter seals with a compatible bottom seal. This is particularly relevant where speech privacy matters, such as offices, consulting rooms and shared accommodation.
For a home office, a useful starting point is to assess the existing door, identify gaps around the frame, and consider a coordinated perimeter-and-bottom sealing arrangement. Adding only a bottom strip may leave the main leakage paths untreated.
The door itself still matters
Seals cannot compensate indefinitely for a lightweight or poorly performing door leaf. Once leakage around the edges is controlled, the construction of the door may become the limiting factor. Higher acoustic targets may require a purpose-designed acoustic door assembly, not simply a more substantial seal.
Noise can also travel through adjoining walls, ceilings, floors and other routes. This is known as flanking transmission. Where those paths dominate, improving the door seals alone will have limited effect.
Understand what an acoustic rating actually means
You may see an Rw rating, a laboratory measure of sound reduction. The important question is: what was tested?
A result achieved with a particular door leaf, frame and sealing arrangement is not a guaranteed improvement from fitting one of those seals to a different door. Do not add component ratings together or interpret a system rating as the number of decibels a seal will remove from your room. Laboratory results also do not guarantee identical performance on site.
For a project with a specified acoustic target, ask for evidence covering the proposed door construction and complete seal arrangement. For confidential rooms, studios or other demanding applications, obtain an acoustic specification before ordering.
Using Door Seals for Draught and Weather Protection
Draught seals help control unwanted airflow between conditioned rooms and outside or unconditioned areas. Treating gaps around external doors and doors to spaces such as garages can improve comfort during both heating and cooling seasons. The appropriate product depends on the gap, door operation and surrounding surfaces.
For an ordinary residential doorway, the solution may be a suitable perimeter weatherstrip combined with a compatible bottom seal. Where a door is exposed to weather, select a product intended for that exposure - not simply an indoor acoustic seal that happens to fit. Raven, for example, distinguishes between general draught seals, door sweeps and products designed for weather or storm protection.
At exposed entrances, check the manufacturer's weather-performance information and the required sill or threshold arrangement. Treat water management as a separate selection question rather than assuming that "draught sealed" means "rainproof".
Do not seal away necessary ventilation
Uncontrolled draughts and planned ventilation are different things. Improving airtightness needs to be balanced with adequate fresh air and moisture removal. Before closing an internal under-door gap, check whether it provides a necessary air-transfer path, including make-up air for an exhaust system.
Take particular care around gas appliances. Fixed ventilation associated with open-flued or flueless gas heaters must not simply be blocked. Seek advice from a licensed gas fitter before draught-proofing a space where combustion-air requirements could be affected.
The aim is to remove unwanted leakage without compromising a ventilation or combustion-air requirement.
Fire Door Seals: Protect the Approved Assembly
A fire door is not just a heavy door with a special strip attached. Its performance depends on the door assembly, including its construction, frame, hardware, seals and installation.
Two important Australian standards are: AS 1905.1, which addresses the construction and installation of fire-resistant doorsets; and AS 1530.4, which provides fire-resistance test methods for elements of construction. The relevant evidence must support the proposed assembly and permitted configuration.
What does an intumescent seal do?
An intumescent material expands when exposed to sufficient heat. Within an appropriate fire-door system, this expansion helps close gaps and restrict the passage of fire and hot gases.
That does not mean an intumescent strip will make an ordinary door fire-rated. The material, dimensions, location and installation must suit the door system for which it is approved.
"Suitable for fire doors" does not always mean "intumescent"
Some acoustic or smoke seals are approved for use on particular fire doors because their inclusion does not reduce the established fire-resistance level, or FRL, of that construction. They do not necessarily achieve this through intumescent expansion.
Kilargo's product guidance makes the distinction explicit: approval must be checked with the relevant fire-door manufacturer for the particular door construction. A general product description is not a substitute for that confirmation.
Before adding or replacing seals on a fire door, establish the existing door system and the permitted sealing arrangement. Do not select a replacement solely because it looks similar or covers the same gap.
Smoke Seals: A Different Performance Requirement
Fire resistance and smoke leakage are separate characteristics.
A fire-resistant door is not automatically a smoke-control door. Smoke sealing needs to limit leakage under the conditions required by the project, which may include ambient and elevated temperatures.
Flexible smoke-sealing fins or gaskets can provide contact before an intumescent material activates. An intumescent-only strip should not be assumed to provide ambient-temperature smoke control simply because it is described as a fire seal.
Some products combine these functions. For example, a seal may use flexible fins for acoustic and smoke sealing alongside an intumescent section for fire performance. Each claimed function still needs appropriate supporting evidence.
Which smoke standards matter?
AS 1530.7 addresses smoke-leakage testing of door and shutter assemblies at ambient and medium temperatures.
AS 6905 addresses smoke-door requirements, including construction, installation and performance criteria, where specified or applicable to the project.
Check the full requirements - not merely whether a product description mentions a test standard. The tested door configuration, temperature, pressure and acceptance criteria matter.
A useful question for a supplier or specifier is:
"What evidence shows that this seal arrangement meets the smoke-leakage requirement on this particular door?"
That is more meaningful than asking whether a loose strip is "smoke rated". The objective is verified limitation of smoke leakage, not an unsupported promise that no smoke can ever pass.
Australian Compliance: Check Before Altering an Apartment or Commercial Door
Fire and smoke requirements depend on the building, doorway location, approved design and applicable regulations. The relevant NCC edition also needs to be checked: adoption and transition arrangements can differ between jurisdictions.
For a regulated building, the approved fire-safety documentation and required performance should guide the work. For example, NSW council guidance explains how fire-safety schedules identify required measures and their standards of performance.
For an apartment entry or commercial fire door, our recommended starting point is to consult the building manager or owners corporation and the relevant fire-door specialist, building surveyor or certifier.
Before work proceeds, establish whether routing, trimming, new fixings or a different seal are permitted. Also check that the finished installation will preserve the required closing, latching and access performance. Seal manufacturers identify both door-system approval and operating-force considerations as part of appropriate selection.
Easy to attach does not mean automatically approved. This applies to adhesive seals as much as concealed products requiring machining.
Examples From Keeler Hardware's Door Seal Range
The following illustrate different product categories available through Keeler. They are starting points for selection - not a universally approved combination for every doorway. Keeler's range includes perimeter weatherstrips, acoustic seals, automatic bottom seals and specialist fire-sealing products.
| Product example | Where it may fit |
|---|---|
| Raven R48 EPDM weatherstrip | A self-adhesive perimeter weatherstrip for suitable door and window gaps. An example of a basic draught-sealing option, rather than a reason to assume fire or smoke compliance. |
| Raven RP120 perimeter seal | A discreet acoustic and smoke-sealing profile for suitable rebated frames. Check its working gap and the suitability of the surface for adhesive fixing. |
| Raven RP8Si automatic bottom seal | A concealed, morticed bottom seal for applications where the door construction can accommodate it. Check the permitted machining and relevant system evidence before use on a regulated door. |
| Kilargo IS8011si automatic bottom seal | A face-fixed or semi-rebated option that may suit a retrofit where a fully concealed seal is impractical. Confirm the required configuration and any fire-door approval. |
| Kilargo KG4002 intumescent fire seal | A specialist retrofit product for upgrading certain existing fire-door perimeter arrangements. Its use depends on the applicable door-system approvals; it is not a general-purpose substitute for an acoustic or ambient smoke seal. |
For higher-performance applications, choose the complete, documented arrangement first and the individual components second.
How to Measure, Select and Check a Door Seal
1. Identify the door and the performance required
Record whether the door is internal or external, single or double, and whether it has acoustic, fire, smoke or access requirements. Note its material, thickness, opening direction, frame profile and finished floor surface.
For a regulated door, obtain its identification and approved specification before selecting a substitute product.
2. Measure the actual gaps - not just the door width
Measure at several points along the top, sides and bottom, with the door closed. Record the smallest and largest gaps. Check for uneven clearances or a floor that changes level through the opening swing.
A seal must suit the gap it is expected to bridge. Significant fit problems may need door adjustment or carpentry rather than a larger strip.
Importantly, a seal's stated operating range is not permission to use that same clearance on any fire door. The approved door construction remains the governing consideration.
3. Check fitting space, seal length and cut-back limits
A concealed drop seal needs space within the door bottom. A surface-mounted model needs suitable fixing positions and clearance.
Do not assume every automatic seal can be shortened by the same amount, or from either end. Manufacturers specify permitted cut-backs, and these can vary with the supplied length.
Also check whether the specified bottom seal needs a threshold plate or another suitable landing surface.
4. Prepare the fixing surfaces properly
Self-adhesive seals need a suitable clean, dry surface and correct positioning. Surface finish matters: Raven notes that certain oiled and easy-clean paint finishes can prevent effective adhesion of its RP120 seals. Follow the particular product's instructions rather than assuming all adhesive strips behave alike.
For fire and smoke doors, installation should follow the approved system instructions - not a generic draught-proofing method.
5. Check contact without over-compressing the seal
The aim is consistent contact, not maximum pressure.
Raven recommends checking perimeter contact with a sheet of paper and ensuring automatic bottom seals contact the sill or threshold correctly. Excessive adjustment can cause wear or dragging. These are useful fit checks, but they do not establish an acoustic rating or certify fire and smoke performance.
Finally, confirm that the door still operates as required. A seal should solve the leakage problem without creating a new usability problem.
Maintenance: A Good Seal Must Keep Working
Periodically inspect seals for damage, detachment, loss of contact and debris. Check that automatic seals lower and retract correctly, and replace worn components with appropriate replacements.
Follow the manufacturer's cleaning guidance. Raven recommends a damp cloth with a mild detergent solution and warns against solvents that can damage seal materials.
For fire and smoke doors, include seals in the building's required inspection and maintenance process. Requirements vary by jurisdiction and building; these checks are not replaced by an occasional homeowner inspection.
Choose the Right Seal for the Job
The best door seal is not necessarily the thickest, the most expensive or the easiest to attach. It is the one that suits the doorway, delivers the required performance and works as part of the complete installation.
For sound reduction, assess the whole opening and the door itself. For draught control, address unwanted leakage without blocking necessary ventilation. For fire and smoke protection, start with the approved assembly and supporting evidence - not a generic product label.
Keeler Hardware's Door Seals Section is a useful starting point, alongside advice from our team. When making an enquiry, provide photographs of the door, frame and threshold, measured gaps, and a clear description of what you need to achieve. For a fire or smoke door, include its identification or approved specification wherever available.
Choose for the performance of the whole doorway - not simply the gap you can see.
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