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Hush HD1033 LP/MF17 is a complete floor-and-ceiling acoustic treatment for converting older buildings with timber separating floors and retained lath-and-plaster ceilings. It combines a floating Hush Panel 17 floor, perimeter isolation, insulation within a suspended Hush-MF ceiling and two layers of Soundbloc plasterboard. That two-sided approach is important: treating only the floor or only the ceiling leaves sound paths through the structure and wall junctions. Hush presents the system for change-of-use projects and conversions into multiple properties, but the product code is not a performance guarantee for every existing building. The actual build-up, substrate condition, workmanship and junction details must be checked against the current project documentation.
What is the Hush HD1033 separating-floor system?
HD1033, also called the Hush Acoustic System LP/MF17, is Hush Acoustics’ refurbishment specification for separating floors in older buildings. “LP/MF” refers to the combination of a retained lath-and-plaster ceiling context and an MF (metal-frame) suspended ceiling treatment. The system is intended for timber floors where the original boards or another suitable structural deck remain above timber joists.
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Hush describes the assembly in its older-building conversion guidance as a complete acoustic treatment rather than a single proprietary board. Above the floor, Hush Panel 17 forms a resilient floating layer. Below, Hush-Slab 100 is installed in the Hush-MF ceiling system and finished with two layers of Soundbloc plasterboard. Perimeter isolation strips separate the floating floor from the surrounding walls, helping prevent impact energy from bypassing the floor through flanking paths.
That distinction matters on conversion projects. A separating floor has several possible transmission routes: directly through the floor, through the ceiling below, and sideways through joists, walls, ceilings and service penetrations. HD1033 addresses the principal floor and ceiling surfaces together, while the perimeter treatment deals with one of the most common junctions where a floating layer can otherwise touch the building fabric.
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Why is a two-sided treatment useful in an older conversion?
A floating floor reduces the direct transfer of impact energy from footsteps, dropped objects and moving furniture. The resilient layer decouples the new floor surface from the structural deck. The ceiling treatment adds absorption and mass below the joists, reducing the amount of airborne sound entering the room beneath and helping limit sound radiated by the floor structure.
Older buildings are rarely uniform. Joist depths, board condition, wall connections and previous alterations can differ from one room to the next. Lath-and-plaster ceilings may be sound, cracked, partially removed or already carrying several layers of paint and repair. A system that works as a coordinated floor-and-ceiling build-up is therefore more appropriate than assuming that one acoustic panel can solve every path.
Hush’s product information says perimeter isolation is used at wall junctions so impact noise is less likely to become flanking transmission. In practical terms, the floating layer must remain separated from the walls around its edge; a hard bridge at a skirting, partition or service opening can undermine the decoupling achieved across the main floor area.
What components make up HD1033?
The exact specification should come from the current HD1033 data sheet and system drawings, but the published description identifies these principal elements:
- Hush Panel 17: the resilient acoustic floor layer installed as a floating floor over the original boards or another suitable structural deck.
- Perimeter isolation strips: installed at wall junctions so the floating floor does not form a rigid edge bridge.
- Hush-MF ceiling system: the suspended metal-frame arrangement below the existing floor.
- Hush-Slab 100: insulation fitted within the ceiling system.
- Two layers of Soundbloc plasterboard: the ceiling lining used to add mass and complete the lower-side treatment.
- Optional insulation between joists: included only where the project specification calls for it; do not add or substitute materials without checking the system details.
Hush’s HD1033 product page also directs project teams to its technical support route. That is useful where joist geometry, existing ceiling retention, service routes or junctions differ from the standard drawings.
How should HD1033 be planned before work starts?
Start with a survey, not with material ordering. Confirm that the floor is a suitable timber separating floor, record joist direction and depth, inspect the original boards, and map every wall and service penetration that meets the floor. At ceiling level, determine whether the lath-and-plaster ceiling is in good enough condition to remain, requires local repair, or must be dealt with as part of a different build-up.
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- Record the existing construction. Photograph floorboards, joists, wall junctions, chimney breasts, stair openings and service penetrations. Note any areas where boards are loose or damaged.
- Check levels and loading. A floating floor and a suspended ceiling alter finished floor and ceiling levels. Confirm that doors, stairs, skirtings, sanitary fittings and services can accommodate the build-up, and obtain the project’s structural advice where required.
- Agree the system boundaries. Identify which rooms and partitions are included. A floor that stops at a lightweight partition or is bridged by a service chase may create a weak flanking route.
- Obtain current technical documents. Use the latest HD1033 data sheet and drawings, rather than relying on an old quotation or a component list copied from another Hush system.
- Coordinate trades. Decide who installs the floor layer, ceiling frame, insulation, plasterboard, skirtings and services. The acoustic separation must survive each trade’s work.
Do not assume that a retained lath-and-plaster ceiling is automatically suitable because it looks intact. Its condition, attachment and interaction with the proposed suspended frame should be addressed in the project design.
How is the floor side of HD1033 installed?
The floor-side principle is a floating layer over the original boards or a suitable structural deck. Hush’s installation notes call for tight, staggered panel joints and perimeter isolation at wall junctions. Those details are not cosmetic: open joints or a rigid edge contact can create a direct acoustic bridge.
- Prepare the deck. Remove loose debris and address defective boards or local irregularities identified by the survey. The deck must be structurally suitable and sufficiently even for the specified floating layer.
- Install perimeter isolation first. Place the specified isolation strip wherever the floating floor meets walls or other rigid boundaries. Keep the separation continuous around corners and interruptions.
- Lay Hush Panel 17. Position panels over the prepared deck with joints tight and staggered as directed by the system instructions. Avoid creating continuous joint lines through the floor.
- Protect the isolation zone. Do not allow adhesive, screws, skirting, pipes or temporary fixings to form a hard bridge between the floating layer and the wall.
- Complete the specified finish. Install the project’s floor finish and edge details without compressing or bypassing the isolation strip. Where a finish needs a special fixing method, confirm it with the technical adviser first.
The published notes do not authorise a generic substitute for the panel, adhesive or edge treatment. If the existing deck needs extensive levelling or partial replacement, stop and confirm that the revised build-up remains an HD1033 installation.
How is the ceiling side installed?
Below the floor, Hush describes Hush-Slab 100 within a Hush-MF ceiling system, finished with two layers of Soundbloc plasterboard. This creates a suspended, insulated and mass-loaded ceiling rather than simply fixing a board directly to the underside of the joists.
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- Fit the specified insulation. Install Hush-Slab 100 within the frame without gaps or compression that would alter the intended arrangement.
- Maintain edge separation. Ensure the ceiling perimeter and any service openings follow the acoustic detail. Rigid contacts to adjoining construction can transmit sound around the insulated field.
- Fix both plasterboard layers as specified. Stagger joints between layers and seal or detail penetrations according to the project drawings. Avoid aligning openings through both boards unless the detail allows it.
- Inspect before closing up. Photograph insulation coverage, frame clearances and perimeter treatment. Rectify missing or displaced components before the ceiling is concealed.
The two ceiling layers should be treated as part of the tested or specified assembly. Replacing them with a different board, omitting a layer or changing the frame arrangement means the finished work is no longer the same documented system.
What acoustic and fire performance does Hush report?
The HD1033 product page lists typical figures of 54 dB impact, 58 dB airborne and 50 dB airborne with Ctr. However, Hush states that these typical results are based on HD1030, minimum 200 mm joists and a full lath-and-plaster ceiling in good condition. They are therefore manufacturer-reported, qualified reference values—not an independent HD1033 guarantee for a particular property. Check the current HD1033 documentation and request project-specific advice before using them as a design prediction.
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Hush’s conversion article also says the complete system provides one hour of fire resistance at ceiling level. That is a manufacturer claim for the described assembly. Fire performance depends on using the specified components, fixings, joints and interfaces; it should not be transferred to a different ceiling or to a partial installation.
For context, Hush’s separate HD1050 technical sheet warns that measurements can vary with structural differences, site conditions and workmanship, and that indicative test results do not warrant performance in a particular situation. Although HD1050 is a different specification, the caution is relevant to how any refurbishment acoustic figure should be interpreted.
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Which UK building-regulation provisions does Hush associate with HD1033?
Hush says its complete HD1033 treatment is intended to meet the requirements it names as Approved Document E in England and Wales, Section 5 in Scotland, and Part G in Northern Ireland. These references differ by jurisdiction, so the applicable approval route depends on where the building is located and on the project’s use and scope.
This statement is not a site-specific compliance determination. Building-control acceptance can depend on the existing structure, separating-wall construction, room arrangement, junctions, fire strategy and the exact installed build-up. The designer and building-control team should verify the applicable provisions and retain the current system evidence in the project file.
How can you prevent flanking transmission?
Flanking is sound that travels around, rather than directly through, the principal floor or ceiling treatment. Typical risk points include the floating floor touching a wall, joists bearing into a separating wall, gaps around pipes and ducts, chimney breasts, stair enclosures and a suspended ceiling that is rigidly connected to adjoining construction.
- Keep perimeter isolation continuous at the floating floor edge.
- Do not let skirtings, thresholds, pipes or fixings bridge the resilient layer.
- Coordinate ceiling and wall perimeters so the MF lining does not create a rigid bypass.
- Seal service penetrations with the specified detail; do not improvise with a hard infill that connects both sides.
- Inspect junctions before finishes conceal them and record the installed details.
The system’s acoustic benefit is not determined by the panel alone. A neat central floor installation can still underperform if a wall junction or service opening provides a continuous rigid route.
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How does HD1033 differ from other Hush system codes?
These systems are not interchangeable product numbers. Choose by the retained substrate and the project context, then confirm the complete assembly:
| System | Published context | Why it is not a direct substitute for HD1033 |
|---|---|---|
| HD1033 LP/MF17 | Older-building conversions with timber floors and lath-and-plaster ceilings; floor and ceiling treatment | The system described for this article |
| HD1030 LP | Refurbishment where a timber deck is retained | Related refurbishment specification with its own build-up and evidence |
| HD1050 LP/MF | Separate lath-and-plaster/MF refurbishment specification | Distinct technical specification; do not transfer its components or results |
| HD1007 HDC | High-density concrete floor construction | Different substrate and therefore not a like-for-like timber-floor alternative |
Hush’s pages for HD1030, HD1050 and HD1007 describe their own contexts. They should be used for comparison of substrate and application, not as a basis for borrowing a layer, thickness or performance number for HD1033.
What are the most common HD1033 installation mistakes?
- Using Hush Panel 17 by itself: the panel is one component of a floor-and-ceiling treatment, not a complete separating-floor solution.
- Bridging the perimeter: a skirting, pipe or fixing that touches both the floating floor and wall can defeat edge isolation.
- Substituting materials: a different insulation, plasterboard or frame may change acoustic and fire behaviour.
- Quoting the headline figures without their basis: the published typical values are tied to HD1030, 200 mm minimum joists and a good full lath-and-plaster ceiling.
- Ignoring the existing ceiling: cracks, missing lath, loose plaster or previous openings can affect the suitability of the retained construction.
- Closing up before inspection: missing insulation or unsealed penetrations become expensive to correct once the ceiling and finishes are complete.
- Assuming a product code proves compliance: approval still depends on the actual property, jurisdiction and installed details.
What should be handed over at completion?
Keep the current HD1033 data sheet, system drawings, product delivery records and photographs of concealed work. Record the floor substrate, joist arrangement, perimeter isolation, insulation coverage, MF frame and plasterboard layers. Note any approved departures from the standard detail and obtain written technical confirmation for them.
A concise handover should also identify the locations of service penetrations, access panels and any areas where the existing ceiling was repaired. Future contractors then have a better chance of avoiding accidental acoustic bridges when installing shelves, lighting, pipes or replacement floor finishes.
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Is HD1033 a sensible choice for an older-building conversion?
It can be a sensible starting specification when the project has a timber separating floor, a retained lath-and-plaster ceiling and a need to treat both sides of the construction. Its strength is the coordinated assembly: floating floor, resilient perimeter, insulated MF ceiling and double plasterboard lining. That is more defensible than selecting a single “soundproofing” board without addressing flanking paths.
The decision should remain project-specific. Confirm the existing construction, use the current Hush documentation, coordinate all junctions and ask Hush technical support about unusual conditions. Treat the published acoustic and fire figures as qualified manufacturer information, not as a promise that every converted building will achieve the same result.
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How to specify HD1033 in a project brief
State the complete HD1033 LP/MF17 system and identify the rooms and separating elements covered. List the required floor-side and ceiling-side components, require continuous perimeter isolation, and make the installer responsible for following the current system drawings. Include a hold point for inspection before the ceiling is closed.
The brief should also say that substitutions require written approval, that service penetrations must follow the acoustic detail, and that regulatory acceptance is to be confirmed for the project’s UK jurisdiction. This prevents a quotation from quietly omitting the ceiling treatment or replacing a specified layer with a visually similar but unverified product.
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Frequently Asked Questions
Can Hush Panel 17 be installed without the suspended ceiling?
Hush identifies Panel 17 as the floating-floor component of HD1033, not as a standalone separating-floor treatment. Omitting the Hush-MF ceiling, Hush-Slab 100 or the specified plasterboard changes the assembly and means the published system description and performance references may no longer apply.
Will HD1033 work over a concrete slab?
HD1033 is described for older-building timber floors with lath-and-plaster ceiling conditions. Hush lists HD1007 separately for high-density concrete floor construction, so a concrete project should be assessed against the appropriate concrete-floor specification rather than adapting HD1033 by assumption.
Do the 54 dB and 58 dB figures guarantee my converted flat will pass?
No. Hush labels them typical results and says they are based on HD1030, minimum 200 mm joists and a full lath-and-plaster ceiling in good condition. Existing construction, junctions, workmanship and site conditions can change the outcome, so obtain current project-specific advice.
What should happen if the lath-and-plaster ceiling is damaged?
Document the damage and have the designer or technical adviser decide whether it can be repaired and retained. The published reference condition assumes a full ceiling in good condition, so a substantially missing or loose ceiling should not be treated as equivalent without a revised detail.
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Only if the change is reviewed and approved as part of the project design. HD1033’s acoustic and fire claims relate to the described assembly, and an apparently similar board, frame or insulation can alter mass, stiffness, junctions or fire performance.

