Lorient LAS4010 75mm Threshold Plate is a low-profile aluminium threshold plate designed to provide a firm and even sealing surface beneath single and double swing doors.
Measuring 75mm wide and 6mm high, the LAS4010 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 sloping, low-profile design is suitable for wheeled traffic and provides a practical threshold for residential, commercial and public-building doorways.
The LAS4010 is installed on the floor or sill directly beneath a door.
It is commonly used to:
Automatic drop seals and other 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 floor finishes can prevent the gasket from making consistent contact across the full width of the doorway.
The LAS4010 creates a durable aluminium contact surface beneath the door. When the door closes, the selected automatic drop seal or door-bottom gasket contacts the threshold plate instead of the uneven floor beneath it.
This helps create more uniform gasket contact and reduces open paths beneath the door.
No. The LAS4010 is a threshold plate and does not contain a flexible sealing gasket.
It should be combined with a suitable automatic drop seal or face-fixed door-bottom seal where containment beneath the door is required.
Lorient states that the LAS4010 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 LAS4010 can contribute towards:
The threshold plate does not provide these functions independently. Its purpose is to give the associated sealing gasket a firm and even surface against which to close.
The LAS4010 can form part of an acoustic door-sealing system by improving contact beneath a suitable automatic drop seal.
The gap beneath a door can be a significant sound-leakage path. Installing a smooth threshold plate can help the door-bottom gasket close this gap more consistently than it would against carpet, grout joints or uneven flooring.
However, the LAS4010 does not have a standalone acoustic rating.
Any quoted acoustic performance applies to the complete tested door assembly and specified sealing arrangement, including:
An automatic drop seal may not make reliable contact when it closes directly onto a soft or uneven floor.
Common problems include:
The LAS4010 provides a fixed aluminium surface across the doorway, helping the gasket maintain more consistent contact.
The LAS4010 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 LAS4010 as suitable for wheeled traffic.
Its profile rises gradually to a maximum height of 6mm, providing 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 LAS4010 is the narrowest option within Lorient’s LAS4010 to LAS4013 threshold-plate range.
Its 75mm width can be useful where:
The correct threshold width should be selected according to the floor transition, door configuration, gasket position and project requirements.
The Lorient threshold-plate range is available in four widths:
The LAS4010 provides the narrowest floor coverage, while the wider models are useful where a broader transition or gasket contact area is required.
Measure the doorway and clearance beneath the door before ordering.
Lorient states that the LAS4010 requires at least 8mm clearance between the door and floor for effective operation.
The threshold plate itself is 6mm high, so sufficient clearance must remain for the door to pass over the profile without scraping or preventing correct operation.
Also confirm:
The LAS4010 should be treated as one component within a complete door-sealing system. It does not independently soundproof, smoke-seal, weather-seal or fire-rate a doorway.
Lorient LAS4010 is a low-profile aluminium threshold plate measuring 75mm wide and 6mm high. It provides a firm and even sealing surface beneath single and double swing doors.
| Product Name | Lorient LAS4010 75mm Threshold Plate |
| Manufacturer | Lorient |
| Product Reference | LAS4010 |
| Product Type | Low-profile aluminium threshold plate |
| Width | 75mm |
| Overall Height | 6mm |
| Material | Aluminium |
| Standard Finish | Silver anodised aluminium |
| Alternative 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 or sill-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 Methods | Screw fixing or suitable construction adhesive, depending on the substrate and project requirements |
| 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 appropriate for the substrate |
| External Installation | Apply suitable sealant where the threshold plate meets the door stops to help prevent water ingress |
| UL Certification Reference | R27972 |
| Positive-Pressure Classification | 5DL3 classification shown in the current fitting guide |
| Standalone Acoustic Rating | None stated — acoustic performance depends on the complete tested door and sealing arrangement |
| Standalone Smoke Rating | None stated — containment depends on the associated threshold seal and complete doorset |
| LAS4010-Specific FD30 or FD60 Evidence | Not stated in the current Lorient V5 datasheet; the listed BS EN 1634-1 FD30 and FD60 evidence applies specifically to the LAS4011 |
| Complete Seal? | No — the LAS4010 is a threshold plate and requires a suitable drop or door-bottom seal |
| Option | Width | Height | Typical Use |
|---|---|---|---|
| LAS4010 1m | 75mm | 6mm | Standard single-door openings, subject to the measured doorway width |
| LAS4010 2.1m | 75mm | 6mm | Wider openings, double doors or cutting into project-specific lengths |
| Special-Order Length | 75mm | 6mm | Non-standard doorways and project-specific requirements |
| Product | Width | Height |
|---|---|---|
| LAS4010 | 75mm | 6mm |
| LAS4011 | 100mm | 6mm |
| LAS4012 | 125mm | 6mm |
| LAS4013 | 150mm | 6mm |
The LAS4010 can be installed beneath:
Lorient states that the LAS4010 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, assessment or doorset certification.
The current Lorient fitting guide states that the LAS4010 requires at least 8mm clearance between the door and floor for effective operation.
The threshold plate itself is 6mm high. The additional clearance allows the door to travel over the profile without rubbing or preventing correct operation.
The door must continue to:
Measure the clearance at several positions across the doorway and throughout the door’s swing path, as the floor may not be level.
A threshold plate can support acoustic sealing by giving an automatic drop seal a firm and consistent contact surface.
However, the LAS4010 does not have a standalone Rw or decibel rating.
Final sound reduction will depend on:
Do not specify or advertise the LAS4010 as independently achieving a particular acoustic rating.
The current Lorient V5 datasheet lists fire-test evidence to BS EN 1634-1:2014+A1:2018 for the LAS4011 in FD30 and FD60 applications.
It does not assign this specific FD30 or FD60 evidence to the LAS4010.
The current LAS4010 fitting guide also displays positive-pressure gasketing classification information. This should not be interpreted as a standalone UK fire-resistance rating for the threshold plate.
Where the LAS4010 is proposed for installation beneath a fire-resisting door:
Store the LAS4010:
Take care around freshly cut edges and remove all sharp burrs before installation.
Lorient LAS4010 75mm 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 automatic 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 throughout the complete swing path. The floor may rise at one side or immediately beyond the closed-door position.
Remove the LAS4010 from its packaging and measure the width of the doorway between the jambs or door stops.
Take the measurement at the exact position where the threshold plate will be installed.
If the plate must be cut 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 LAS4010 using a pencil or suitable marker.
Clearly mark:
Check all measurements before cutting.
Cut the aluminium threshold plate using a suitable hand saw or power saw.
Support the profile securely while cutting to prevent vibration, bending or damage to the anodised surface.
Cut slowly and accurately, particularly where the ends must be profiled around the door stops.
After cutting:
Position the LAS4010 on the door 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:
Select the fixing method according to the floor construction, site conditions, doorset evidence and project specification.
Screw fixing creates a mechanical connection but requires confirmation that the floor can be drilled safely.
Adhesive fixing avoids drilling through the floor but requires a sound, clean substrate and a construction adhesive compatible with aluminium and the floor material.
Mark suitable fixing positions along the threshold plate.
Using a power drill and a 4.5mm drill bit, drill the required fixing holes through the aluminium profile.
Space the holes sufficiently to hold the plate securely along its full length.
Countersink each hole so that the screw heads finish flush with the upper surface.
Raised screw heads could:
Return the threshold plate to its final position.
Using the drilled holes as a guide, mark the fixing-hole centres onto the floor.
Check the plate position and gasket alignment before removing it for drilling.
Remove the LAS4010 and drill the marked floor positions.
The Lorient fitting guide specifies a 6mm masonry drill bit where the supplied plastic plugs are suitable for the substrate.
Before drilling, confirm that:
Use alternative substrate-specific fixings where the supplied plugs are not suitable.
Remove all drilling dust and debris before inserting the plugs.
Insert the supplied plastic plugs where appropriate and place the LAS4010 back into position.
Install the supplied screws and tighten them evenly along the plate.
Check that every screw head finishes flush within its countersunk hole.
Do not overtighten the fixings, as this could distort the 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 flooring or contaminated surfaces.
Apply a suitable construction adhesive to the underside of the LAS4010.
Use enough adhesive to secure and support the plate without allowing it to spread beyond the edges or onto the visible anodised surface.
Position the plate carefully and press it firmly into its final location.
Check the alignment beneath the door-bottom gasket immediately, as repositioning may become difficult once the adhesive begins to grip.
Keep the threshold 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 permit 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 separate fitting instructions.
The gasket should contact the LAS4010 consistently across the full width of the doorway.
Check for:
Do not over-adjust the seal. Excessive compression can increase operating forces, damage the gasket and place unnecessary strain on the drop-seal mechanism.
Open and close the door several times.
Confirm that:
The installation must not impede the opening or closing of the door.
Inspect the LAS4010 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 LAS4010 is a supporting threshold component. It does not provide complete acoustic, smoke, weather, draught, light or fire 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, assessment or doorset certification.
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