Lorient LAS4002 40mm Threshold Plate is a gently curved, low-profile aluminium threshold plate designed to provide a firm and even sealing surface beneath single and double swing doors.
Measuring 40mm wide and 5mm high, the LAS4002 can improve the effectiveness of automatic drop seals and face-fixed door-bottom seals by giving the sealing gasket a smooth, consistent surface against which to close.
Its slim, curved profile is suitable for wheeled traffic and creates a neat transition across the doorway without introducing a large or abrupt threshold.
The LAS4002 is installed on the floor or sill directly beneath the door.
It is commonly used to:
Door-bottom seals work most effectively when their gasket closes against a firm, smooth and continuous surface.
Carpet, grout joints, uneven tiles, timber boards and changes between different floor finishes can prevent a gasket from making consistent contact across the full width of the doorway.
The LAS4002 creates a durable aluminium contact surface beneath the door. When the door closes, the automatic drop seal or door-bottom seal rests against the threshold plate rather than the uneven floor beneath it.
This helps create more uniform gasket contact and reduces open paths beneath the door.
No. The LAS4002 is a threshold plate and does not contain a flexible sealing gasket.
It should be used with a suitable automatic drop seal or face-fixed door-bottom seal where containment beneath the door is required.
Lorient states that the LAS4002 can be used with practically any suitable drop or door-bottom seal.
The correct combination will depend on:
When used with a suitable threshold seal, the LAS4002 can contribute towards:
The threshold plate does not provide these functions independently. Its purpose is to improve the surface against which the associated gasket seals.
The LAS4002 can form part of an acoustic door-sealing system by supporting consistent contact beneath an automatic drop seal.
Gaps beneath doors are a common sound-leakage path. Providing a smooth threshold surface can help the selected door-bottom seal close that path more effectively.
However, the LAS4002 does not have a standalone acoustic rating. Any quoted decibel performance applies to the complete tested door assembly and sealing arrangement, not to the threshold plate in isolation.
Acoustic performance will depend on:
An automatic drop seal may not make consistent contact when it closes directly onto an uneven or soft floor.
Possible problems include:
The LAS4002 provides a fixed aluminium surface across the doorway, helping the gasket maintain more consistent contact.
The LAS4002 is designed for use beneath single and double swing doors.
Suitable applications can include:
For exterior installations, suitable sealant should be applied where the threshold plate meets the door stops to help prevent water ingress.
Yes. Lorient identifies the LAS4002 as suitable for wheeled traffic.
Its gently curved profile rises to only 5mm, creating a smoother transition than a threshold with abrupt vertical edges.
Project-specific accessibility requirements should still be checked before installation, particularly where the doorway forms part of an accessible route or compliance-led design.
The LAS4001 and LAS4002 use a similar gently curved, low-profile design but are available in different dimensions:
The LAS4002 provides a wider sealing surface and may be more suitable where the drop-seal contact area, floor transition or doorway layout requires additional width.
Measure the doorway and the clearance beneath the door before ordering.
Lorient states that the LAS4002 requires at least 6mm clearance between the door and floor for effective operation. The LAS4002 itself is 5mm high, so the door must have enough clearance to pass over the profile without rubbing.
Also confirm:
The LAS4002 should be treated as one component within a complete door-sealing arrangement. It does not independently soundproof, smoke-seal or weather-seal a doorway.
Lorient LAS4002 is a gently curved, low-profile aluminium threshold plate measuring 40mm wide and 5mm high. It is designed to provide a smooth sealing surface beneath single and double swing doors.
| Product Name | Lorient LAS4002 40mm Threshold Plate |
| Manufacturer | Lorient |
| Product Reference | LAS4002 |
| Product Type | Gently curved, low-profile threshold plate |
| Width | 40mm |
| Overall Height | 5mm |
| Material | Aluminium |
| Standard Finish | Silver anodised aluminium |
| Alternative Finishes | Bronze anodised and other powder-coated colour finishes may be available subject to non-standard charges, minimum order quantities 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 or sill-mounted beneath the door |
| Minimum Door-to-Floor Clearance | 6mm |
| 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 Methods | 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 |
| Plate Drilling | 4.5mm fixing holes drilled through the plate and countersunk so the screw heads finish flush |
| Masonry Drilling | 6mm masonry holes where the supplied plastic plugs are suitable for the substrate |
| External Installation | Apply suitable sealant where the plate meets the door stops to help prevent water ingress |
| Certification Reference | UL R27972 is shown in Lorient’s current combined LAS4001 and LAS4002 product literature |
| Standalone Acoustic Rating | None stated — performance depends on the complete tested door and sealing system |
| Standalone Smoke Rating | None stated — containment depends on the associated threshold seal and complete doorset |
| Standalone Fire Rating | No independent fire-resistance rating is stated for the threshold plate in the current product datasheet |
| Complete Seal? | No — the LAS4002 is a threshold plate and requires a suitable drop or door-bottom seal |
| Option | Width | Height | Typical Use |
|---|---|---|---|
| LAS4002 1m | 40mm | 5mm | Standard single-door openings, subject to the measured doorway width |
| LAS4002 2.1m | 40mm | 5mm | Wider openings, double doors or cutting into project-specific lengths |
| Special-Order Length | 40mm | 5mm | Non-standard doorways and project-specific requirements |
| Product | Width | Height | Profile |
|---|---|---|---|
| LAS4001 | 25mm | 4mm | Gently curved, low-profile aluminium threshold plate |
| LAS4002 | 40mm | 5mm | Gently curved, low-profile aluminium threshold plate |
The LAS4002 can be installed beneath:
Lorient states that the LAS4002 can be used with practically any suitable drop or door-bottom seal.
The selected seal must be suitable for:
Where a particular acoustic, smoke or fire performance is required, use the complete component arrangement stated within the relevant test evidence or doorset certification.
The current Lorient fitting guide states that the LAS4002 requires at least 6mm clearance between the door and floor for effective operation.
The threshold plate itself is 5mm high. The remaining clearance allows the door to travel over the plate without binding.
The door must continue to:
Measure the clearance at multiple points across the doorway and throughout the door’s swing path, as floors may not be level.
The LAS4002 has been included within selected Lorient tested acoustic door-sealing systems.
This does not give the threshold plate an independent decibel rating. The quoted rating for any tested arrangement applies to the complete door assembly and specified combination of components.
Final sound reduction will depend on:
Do not advertise or specify the LAS4002 as independently achieving a particular Rw or decibel rating.
The LAS4002 is a supporting threshold component and should not be treated as an independent fire or smoke seal.
Where it is proposed for use with a fire-rated or smoke-control door:
Store the LAS4002:
Take care around freshly cut edges and remove sharp burrs before installation.
Lorient LAS4002 40mm Threshold Plate can be installed beneath single or double swing doors using suitable screw fixings or construction adhesive.
The plate should be measured and cut to suit the opening, positioned beneath the selected drop or door-bottom seal 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 door, frame and floor before cutting or fixing the threshold plate.
Check that:
Measure the door clearance at several positions across the doorway and through the complete swing path. The floor may rise at one side or immediately beyond the closed-door position.
Measure the width of the doorway between the jambs or door stops to determine the required threshold length.
Take the measurement at the exact position where the threshold plate will be installed.
If the profile must fit around the door stops, measure each side carefully. Do not assume that the frame is square or that both stops are identical.
Transfer the doorway measurement onto the LAS4002 using a pencil or suitable marker.
Clearly mark:
Check the measurements before cutting.
Cut the aluminium threshold plate using a suitable hand or power saw.
Support the plate fully while cutting to prevent vibration, bending or damage to the anodised surface.
Cut slowly and accurately, particularly where the ends are being shaped around the door stops.
After cutting:
Position the threshold plate on the sill or floor in the required location before drilling or applying adhesive.
Check that:
Carefully open and close the door while the unsecured plate is held safely in position.
The Lorient fitting guide provides two installation methods:
Choose the method that is appropriate for the floor construction, site conditions and project specification.
Screw fixing creates a mechanical connection but requires confirmation that the floor can be drilled safely.
Adhesive fixing avoids drilling but requires a sound, clean substrate and a construction adhesive compatible with both aluminium and the floor material.
Mark suitable fixing positions along the centre area of the threshold plate.
Using a power drill and a 4.5mm drill bit, drill fixing holes through the plate.
Space the holes sufficiently to hold the profile securely along its full length. Keep the holes away from the thin outer edges of the curved profile.
Countersink each hole so that the screw heads will finish flush with the surface.
Raised screw heads could:
Return the threshold plate to its final position and mark the fixing-hole centres onto the floor.
Remove the plate and drill the marked positions.
Lorient specifies a 6mm masonry drill bit where the supplied plastic plugs are suitable for the substrate.
Before drilling, confirm that:
Use substrate-specific fixings where the supplied plugs are not suitable.
Remove all dust and debris before inserting the plugs.
Insert the plugs where appropriate and place the LAS4002 back into position.
Install the supplied screws and tighten them evenly along the plate.
Check that each screw head finishes flush within its countersunk hole.
Do not overtighten the fixings, as this could distort the curved aluminium profile or pull it unevenly against the floor.
The finished plate should be:
Where adhesive fixing is appropriate, prepare the floor and underside of the threshold plate in accordance with the adhesive manufacturer’s instructions.
The contact surfaces should normally be:
Do not bond the threshold plate onto loose carpet, unstable finishes or contaminated surfaces.
Apply a suitable construction adhesive to the underside of the LAS4002.
Use enough adhesive to support the profile securely without applying so much that it spreads onto the visible surface or obstructs the curved edges.
Position the plate carefully and press it firmly into its final location.
Check the alignment immediately, as adjustment may become difficult once the adhesive begins to grip.
Keep the plate firmly in position while the adhesive cures.
Use suitable weights or temporary restraint where permitted by the adhesive manufacturer, taking care not to bend or mark the aluminium profile.
Do not allow normal foot or wheeled traffic over the plate until the adhesive has achieved the required curing strength.
Curing time will depend on:
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 compatible with:
Apply the sealant neatly without blocking any required drainage paths.
Once the threshold plate is secure, adjust the associated automatic drop seal or door-bottom seal according to its own fitting instructions.
The gasket should contact the LAS4002 consistently across the full width of the doorway.
Check for:
Do not over-adjust the seal. Excessive compression can increase opening forces, damage the gasket and place unnecessary strain on the drop-seal mechanism.
Open and close the door several times.
Confirm that:
The threshold plate must not impede the opening or closing of the door.
Inspect the LAS4002 periodically as part of the door’s normal maintenance programme.
Check for:
Clean the plate with a soft cloth and a suitable mild cleaning product.
Avoid abrasive pads, wire brushes and aggressive chemicals that could damage the anodised finish.
Remove dirt and debris from the sealing surface so the door-bottom gasket can continue to make consistent contact.
The LAS4002 is a supporting threshold component. It does not provide complete acoustic, smoke, weather, draught or light containment by itself.
Final performance depends on:
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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