Lorient LAS4011 100mm Threshold Plate is a low-profile aluminium threshold plate designed to provide a firm, even sealing surface beneath single and double swing doors.
Measuring 100mm wide and 6mm high, the LAS4011 can improve the effectiveness of automatic drop seals and face-fixed door-bottom seals by giving the sealing gasket a smooth and consistent surface against which to close.
Its gently sloping profile is suitable for wheeled traffic, while the durable anodised aluminium finish provides a neat and practical threshold for residential, commercial and public-building doorways.
The LAS4011 is installed on the floor or sill directly beneath a 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, tiles, timber boards and changes between different floor finishes can prevent a drop seal from making consistent contact across the full width of the doorway.
The LAS4011 creates a durable aluminium contact surface beneath the door. When the door closes, the automatic drop seal or door-bottom gasket rests against the threshold plate rather than the uneven floor beneath it.
This helps reduce open gaps and creates more consistent gasket contact across the doorway.
No. The LAS4011 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 LAS4011 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 LAS4011 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 LAS4011 can support an acoustic door-sealing system by improving contact beneath a suitable automatic drop seal.
The gap beneath a door is often a significant sound-leakage path. 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 LAS4011 does not have a standalone decibel rating.
Any quoted acoustic performance will apply to a complete tested door assembly and specified sealing arrangement, including:
The current Lorient technical datasheet lists fire-test evidence for the LAS4011 to BS EN 1634-1:2014+A1:2018 in FD30 and FD60 applications.
This does not mean that the threshold plate independently provides 30 or 60 minutes of fire resistance.
Fire performance applies to the tested doorset construction and component arrangement. Where the LAS4011 is being installed on a fire-resisting door, confirm that its use is covered by the door manufacturer’s test evidence, assessment or certification.
Do not substitute threshold components on a certified fire doorset without confirming compatibility.
An automatic drop seal may not make reliable contact when it closes directly onto a soft or uneven floor.
Common problems include:
The LAS4011 provides a fixed aluminium surface across the doorway, helping the gasket maintain more uniform contact.
The LAS4011 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 LAS4011 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 LAS4011 provides a 100mm-wide threshold surface and sits between the narrower LAS4010 and wider LAS4012 options.
The 100mm width can be useful where:
The correct width should be selected according to the doorway, floor finish, gasket position and doorset specification.
Measure the doorway and the clearance beneath the door before ordering.
Lorient states that the LAS4011 requires at least 8mm clearance between the door and floor for effective operation.
The threshold plate itself is 6mm high, so the available clearance must allow the door to pass over the profile without scraping or preventing the door from closing.
Also confirm:
The LAS4011 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 LAS4011 is a low-profile aluminium threshold plate measuring 100mm wide and 6mm high. It provides a firm and even sealing surface beneath single and double swing doors.
| Product Name | Lorient LAS4011 100mm Threshold Plate |
| Manufacturer | Lorient |
| Product Reference | LAS4011 |
| Product Type | Low-profile aluminium threshold plate |
| Width | 100mm |
| 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 |
| Fire-Test Standard | BS EN 1634-1:2014+A1:2018 |
| Fire-Test Evidence | LAS4011 listed by Lorient for FD30 and FD60 applications within the relevant tested doorset arrangements |
| Certification Reference | UL R27972 |
| Fixing Methods | Screw fixing or suitable construction adhesive, depending on the floor substrate and application |
| Supplied Fixings | Stainless steel screws and plastic plugs are listed in the current Lorient 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 floor substrate |
| External Installation | Apply suitable sealant where the plate meets the door stops to help prevent water ingress |
| Standalone Acoustic Rating | None stated — acoustic performance depends on the complete tested door and sealing system |
| Standalone Smoke Rating | None stated — smoke containment depends on the associated seal and complete doorset arrangement |
| Standalone Fire Rating | No — the FD30 and FD60 evidence applies to relevant tested door assemblies and should not be treated as an independent rating for the plate |
| Complete Seal? | No — the LAS4011 is a threshold plate and requires a suitable drop or door-bottom seal |
| Option | Width | Height | Typical Use |
|---|---|---|---|
| LAS4011 1m | 100mm | 6mm | Standard single-door openings, subject to the measured doorway width |
| LAS4011 2.1m | 100mm | 6mm | Wider openings, double doors or cutting into project-specific lengths |
| Special-Order Length | 100mm | 6mm | Non-standard doorways and project-specific requirements |
| Product | Width | Height |
|---|---|---|
| LAS4010 | 75mm | 6mm |
| LAS4011 | 100mm | 6mm |
| LAS4012 | 125mm | 6mm |
| LAS4013 | 150mm | 6mm |
The LAS4011 can be installed beneath:
Lorient states that the LAS4011 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 LAS4011 requires at least 8mm clearance between the door and floor for effective operation.
The plate itself is 6mm high. The additional clearance allows the door to travel over the threshold without rubbing or preventing correct operation.
The door must continue to:
Measure the clearance at several positions across the doorway and throughout the swing path, as the floor may not be level.
Lorient’s current V5 datasheet lists the LAS4011 with fire-test evidence to BS EN 1634-1:2014+A1:2018 for FD30 and FD60 applications.
This evidence should not be interpreted as an independent 30-minute or 60-minute fire rating for the threshold plate.
The final fire performance depends on the complete tested doorset, including:
For fire-resisting doors, confirm that the proposed LAS4011 installation is permitted by the door manufacturer’s evidence or certification before beginning work.
A threshold plate can support acoustic sealing by giving an automatic drop seal a firm and consistent contact surface.
However, the LAS4011 does not have a standalone Rw or decibel rating.
Final sound reduction will depend on:
Do not specify or advertise the LAS4011 as independently achieving a particular acoustic rating.
Store the LAS4011:
Take care around freshly cut edges and remove sharp burrs before installation.
Lorient LAS4011 100mm 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 beyond the closed-door position.
Remove the threshold plate 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 fit around the door stops, measure each side carefully. Do not assume that the door frame is square or that both stops are identical.
Transfer the doorway measurement onto the LAS4011 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 plate fully 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 LAS4011 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 threshold securely along its complete length.
Countersink each hole so that the screw heads will finish flush with the upper surface of the plate.
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 position of the plate and all hole centres before removing it for drilling.
Remove the threshold plate 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 LAS4011 back into position.
Install the supplied screws and tighten them evenly along the threshold.
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.
For fire-resisting doorsets, confirm that adhesive fixing is permitted by the relevant installation evidence before proceeding.
Apply a suitable construction adhesive to the back of the LAS4011.
Use enough adhesive to support the threshold securely without applying so much that it spreads onto the visible surface or beyond the edges.
Place the plate carefully into its final position and press it firmly against the floor.
Check the alignment 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.
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 LAS4011 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 LAS4011 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 LAS4011 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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