Lorient LAS4012 125mm Threshold Plate is a low-profile aluminium threshold plate designed to provide a firm, level sealing surface beneath single and double swing doors.
Measuring 125mm wide and 6mm high, the LAS4012 can improve the effectiveness of automatic drop seals and face-fixed door-bottom seals by giving the gasket a consistent surface against which to close.
Its gently sloping profile is suitable for wheeled traffic, while the durable anodised aluminium finish makes it suitable for residential, commercial and public-building doorways.
The LAS4012 is installed on the floor directly beneath a door. It creates a smooth and consistent surface for a drop seal or door-bottom seal to contact when the door closes.
It is commonly used to:
Door-bottom seals perform most effectively when they close against a firm, smooth and continuous surface.
Soft floor coverings, grout lines, uneven tiles and changes between different flooring materials can prevent a seal from making consistent contact across the full width of the doorway.
The LAS4012 creates an aluminium sealing surface beneath the door. When the door closes, the selected drop seal or door-bottom seal contacts the threshold plate rather than the uneven floor beneath it.
This can help reduce open paths beneath the door through which smoke, draughts, weather and light may otherwise pass.
No. The LAS4012 is a threshold plate, not a flexible door seal.
It must be combined with a suitable automatic drop seal or door-bottom seal where perimeter containment is required.
Lorient states that the LAS4012 can be used with practically any suitable drop or door-bottom seal.
The correct combination will depend on:
When installed with a suitable threshold seal, the LAS4012 can contribute towards:
The threshold plate does not have a standalone acoustic, smoke or weather rating. Final performance depends on the complete door assembly and the seal used with it.
The LAS4012 has also been included as a component within selected Lorient tested acoustic sealing systems. This does not give every door fitted with an LAS4012 the same acoustic rating.
Even a high-quality automatic drop seal may not perform consistently when it closes onto an uneven surface.
Common problems include:
A correctly fitted threshold plate gives the seal a consistent surface across the doorway, helping it maintain more uniform contact.
The LAS4012 is designed for use beneath single and double swing doors.
Suitable applications can include:
For external installations, suitable sealant should be applied where the threshold plate meets the door stops to help prevent water ingress.
Yes. Lorient describes the LAS4012 as a low-profile threshold plate suitable for wheeled traffic.
Its profile rises to only 6mm and has sloping sides rather than an abrupt vertical edge.
Project-specific accessibility requirements should still be checked before installation, particularly in accessible routes, public buildings and compliance-led projects.
At 125mm wide, the LAS4012 provides a broader threshold surface than the narrower LAS4010 and LAS4011 options.
The additional width can be useful where:
The required width should be selected according to the doorway, floor construction, seal position and project design.
Measure both the width of the doorway and the available clearance beneath the door before ordering.
Lorient states that the LAS4012 requires a minimum clearance of 8mm between the door and floor for effective operation. This allows for the 6mm-high threshold profile and correct door movement.
Also confirm:
Do not assume that fitting the threshold plate alone will soundproof or smoke-seal a door. It should form part of a correctly specified door-sealing system.
Lorient LAS4012 is a medium-duty, low-profile aluminium threshold plate measuring 125mm wide and 6mm high. It is designed for use beneath single and double swing doors with a suitable automatic drop seal or door-bottom seal.
| Product Name | Lorient LAS4012 125mm Threshold Plate |
| Manufacturer | Lorient |
| Product Reference | LAS4012 |
| Product Type | Low-profile aluminium threshold plate |
| Duty Classification | Medium duty |
| Width | 125mm |
| Overall Height | 6mm |
| Material | Aluminium |
| Standard Finish | Silver anodised aluminium |
| Non-Standard Finishes | Other colour finishes may be available subject to minimum order quantities, non-standard charges and additional lead times |
| Standard Lengths | 1m and 2.1m |
| Special Lengths | Other lengths may be available to special order |
| Door Types | Single and double swing doors |
| Installation Position | Floor-mounted beneath the door |
| Minimum Door-to-Floor Clearance | 8mm |
| Compatible Seals | Practically any suitable automatic drop seal or face-fixed door-bottom seal |
| Main Function | Provides a firm and even surface against which a door-bottom gasket can seal |
| Containment Characteristics | Contributes towards smoke, weather, draught and light containment when fitted with a suitable threshold seal |
| Wheeled Traffic | Suitable for wheeled traffic |
| Fixing Method | Screw fixing or suitable construction adhesive, depending on the substrate and application |
| Supplied Fixings | Stainless steel screws and plastic plugs are listed in the current fitting guide |
| Screw-Fixing Preparation | 4.5mm holes through the plate, countersunk for flush screw heads; 6mm masonry holes where the supplied plugs are appropriate |
| External Installation | Apply suitable sealant where the plate meets the door stops to help prevent water ingress |
| Manufacturer Certification Reference | UL R27972 shown in Lorient product literature |
| Standalone Acoustic Rating | None stated — performance depends on the complete tested door and sealing system |
| Standalone Smoke Rating | None stated — use with a suitable tested threshold seal and doorset configuration |
| Standalone Fire Rating | No fire rating is stated specifically for the LAS4012 in the current V5 datasheet |
| Complete Seal? | No — the LAS4012 is a threshold plate and requires a suitable drop or door-bottom seal |
| Option | Width | Height | Typical Use |
|---|---|---|---|
| LAS4012 1m | 125mm | 6mm | Standard and smaller single-door openings, subject to the measured doorway width |
| LAS4012 2.1m | 125mm | 6mm | Wider openings, double doors or cutting into multiple project-specific lengths |
| Special-Order Length | 125mm | 6mm | Non-standard doorways and project-specific requirements |
| Product | Width | Height |
|---|---|---|
| LAS4010 | 75mm | 6mm |
| LAS4011 | 100mm | 6mm |
| LAS4012 | 125mm | 6mm |
| LAS4013 | 150mm | 6mm |
The LAS4012 can be used beneath:
Lorient states that the LAS4012 can be used with practically any suitable drop or door-bottom seal.
The selected seal must be suitable for:
Where a specific tested acoustic, smoke or fire performance is required, use only the component arrangement covered by the relevant evidence.
The current Lorient fitting guide states that the LAS4012 requires a minimum clearance of 8mm between the door and floor for effective operation.
The door must continue to open, close and latch properly after the threshold plate and associated seal have been installed.
Check the clearance across the complete width and swing path of the door. Floors may not be level, and a measurement taken at only one point may not identify the tightest clearance.
A threshold plate can support acoustic sealing by giving an automatic drop seal a smooth and consistent contact surface.
However, the LAS4012 does not carry a standalone decibel rating. Any stated acoustic performance applies to the complete tested doorset and component arrangement.
Final sound reduction will depend on:
The current Lorient V5 datasheet lists specific fire test evidence for the LAS4011 in FD30 and FD60 applications. It does not assign that fire evidence to the LAS4012.
Do not assume that the LAS4012 has an independent fire-resistance rating or can be substituted into a certified fire doorset without approval.
For a fire-rated door, confirm the permitted threshold arrangement against the door manufacturer’s evidence, fire-door specification and relevant certification before installation.
Store the threshold plate:
Handle cut edges carefully and remove any sharp burrs before installation.
Lorient LAS4012 125mm Threshold Plate can be installed beneath single or double swing doors using suitable screw fixings or construction adhesive.
The threshold plate must be measured and cut to suit the opening, positioned beneath the door and securely fixed without preventing the door from opening, closing or latching correctly.
Always follow the current Lorient fitting guide and check the requirements of the complete doorset before installation.
Inspect the doorway, door and floor before cutting or fixing the threshold plate.
Check that:
Measure the clearance at several positions across the doorway and through the door’s swing path. The floor may rise or fall across the opening.
Measure the width of the doorway between the jambs or door stops to determine the required threshold length.
Take measurements at the exact position where the threshold plate will be installed.
If the plate must fit around the door stops, mark the required profile carefully. Do not assume that both sides of the frame are identical.
Transfer the doorway measurement onto the LAS4012 threshold plate using a pencil or suitable marker.
Clearly mark:
Check the measurement before cutting.
Cut the aluminium threshold plate using a suitable hand saw or power saw.
Support the threshold plate fully while cutting to prevent vibration, distortion or damage to the anodised surface.
Cut slowly and accurately, particularly where the plate is being profiled around the door stops.
After cutting:
Position the threshold plate on the floor in the required location before drilling or applying adhesive.
Check that:
Open and close the door carefully while the unsecured plate is held safely in position.
The Lorient fitting guide provides two installation methods:
Select the method appropriate for the floor construction, site conditions and project specification.
Screw fixing provides a mechanical connection but requires confirmation that the floor can be drilled safely.
Adhesive fixing avoids drilling through the floor but requires a clean, stable substrate and an adhesive suitable for both aluminium and the floor material.
With the fixing positions marked, drill holes through the aluminium plate using a 4.5mm drill bit.
Space the fixings so that the plate is held securely along its complete length. Keep the fixing positions clear of the thin outer edges of the profile.
Countersink each hole so that the screw heads will finish flush with the top of the threshold plate.
Raised screw heads can:
Return the threshold plate to its final position and mark the fixing-hole centres onto the floor.
Remove the threshold plate and drill the marked floor positions.
The Lorient fitting guide specifies a 6mm masonry drill bit for installation using the supplied plastic plugs.
Before drilling, confirm that:
Use alternative substrate-specific fixings where required.
Clean all dust and debris from the holes and surrounding surface before inserting the plugs.
Insert the supplied plugs where appropriate and place the threshold plate back into position.
Install the screws and tighten them evenly along the length of the plate.
The screw heads must sit flush within the countersunk holes.
Do not overtighten the screws, as this could distort the aluminium profile or pull it unevenly against the floor.
Check that the plate is:
Where adhesive fixing is appropriate, clean and prepare the floor and underside of the threshold plate in accordance with the adhesive manufacturer’s instructions.
Both surfaces should normally be:
Apply a suitable construction adhesive to the underside of the threshold plate.
Use sufficient adhesive to support the profile securely without applying so much that it spreads onto the visible surface or interferes with the edges.
Position the plate carefully and press it firmly into place.
Keep the threshold plate in its correct position while the adhesive cures.
Use suitable weights or temporary restraint where permitted by the adhesive manufacturer, taking care not to distort or mark the aluminium.
Do not allow normal traffic over the plate until the adhesive has reached the required curing strength.
Curing times will depend on the adhesive, temperature, humidity and substrate.
For exterior applications, Lorient states that sealant should be applied where the threshold plate meets the door stops to help prevent water ingress.
Use a suitable external-grade sealant that is compatible with:
Apply the sealant neatly and continuously without blocking drainage paths or interfering with the operation of the door seal.
Once the threshold plate is secure, adjust the automatic drop seal or door-bottom seal according to its separate fitting instructions.
The gasket should make consistent contact with the LAS4012 across the full width of the doorway.
Check for:
Do not over-adjust the door-bottom seal. Excessive pressure can make the door difficult to operate and may shorten the life of the gasket or seal mechanism.
Open and close the door several times after installation.
Confirm that:
The installation must not impede the opening, closing or latching of the door.
Inspect the threshold plate periodically as part of the door’s normal maintenance programme.
Check for:
Clean the plate using a soft cloth and a suitable mild cleaning product. Avoid abrasive tools or aggressive chemicals that could damage the anodised finish.
Remove debris from the sealing surface so the door-bottom gasket can continue to make consistent contact.
The LAS4012 is a supporting threshold component. It does not provide complete smoke, weather, draught or acoustic containment by itself.
Performance depends on the associated drop or door-bottom seal, the perimeter seals, the door construction, the threshold adjustment and the installation quality.
Where the door forms part of a certified acoustic, smoke or fire-resisting assembly, install only the threshold and seal arrangement permitted by the relevant test evidence or doorset certification.
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