BASWA Construction Details | Architectural Interfaces, Perimeters & Services Integration
Arthur Acoustics provides specialist technical guidance, CAD detailing, and certified UK installation for BASWA Construction Details. Achieving a flawless, monolithic acoustic ceiling requires careful planning at every junction, edge, and service penetration. From crisp shadow gaps and recessed lighting to invisible loudspeakers and concealed access hatches, our technical team ensures every architectural detail integrates cleanly into the acoustic plaster plane without compromising sound absorption or structural integrity.
Precision Detailing for Seamless Architecture
Modern architectural design relies on clean transitions and concealed building services. Because BASWA acoustic plaster systems are built up in thicknesses ranging from 30 mm to 70 mm, early coordination of perimeter junctions and ceiling penetrations guarantees sharp lines, crack-free performance, and uninterrupted acoustic control.
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Perimeter & Shadow Gap Junctions. Clean transitions against concrete walls, structural glazing, and conventional plasterboard using dedicated BASWA aluminium edge profiles, crisp shadow gaps, or flush abutting details.
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Recessed Lighting & Linear Slots. Seamless integration of downlights, plaster-in trimless fixtures, and continuous linear LED channels using bespoke backing boxes and reinforced plaster collars.
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HVAC Diffusers, Grilles & Sprinklers. Discreet coordination of slot diffusers, air-supply plenums, smoke detectors, and flush fire sprinklers without disrupting the monolithic aesthetic.
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Concealed Access Hatches. Custom acoustic plaster access panels engineered to receive the exact same marble-sand finish, keeping MEP valves and maintenance points hidden in plain sight.
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Invisible Plastered-In Speakers. Full structural and acoustic integration of invisible loudspeakers behind the BASWA surface for zero-compromise multi-room audio and cinema rooms.
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Movement & Expansion Joints. Carefully engineered control joints positioned across large-span ceilings (typically beyond 15–20 metre runs or at structural slab breaks) to prevent thermal or structural cracking.
Substrate & Structural Build-Up Requirements
Every BASWA system relies on a stable, airtight, and deflection-free substrate to ensure long-term durability and prevent dust-tracking or panel telegraphing:
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Solid Concrete Soffits. Must be dry, clean, structurally sound, and free from release agents or loose coatings prior to direct adhesive bonding.
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Suspended Metal Furring (MF) Grids & Plasterboard. Constructed to strict deflection limits (typically L/500) using airtight plasterboard layers, or direct-to-grid framing when specifying BASWA DTG.
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Curved, Vaulted & Coffered Geometries. Engineered using factory-slotted flexible acoustic panels and curved perimeter trims to follow domes, groin vaults, and sweeping ceiling profiles smoothly.
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Vapour & Air-Tightness Control. Maintaining an airtight barrier behind the acoustic panels is critical so air pressure differentials cannot draw dust through the microporous marble finish.
Technical Support for Architects, Specifiers & Contractors
Arthur Acoustics supports design teams from early RIBA Stage 2 and 3 concept detailing through to RIBA Stage 4 technical drawings and on-site installation:
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2D CAD & BIM Interface Details. Project-specific junction drawings covering perimeter shadow gaps, lighting housings, curtain tracks, and blind boxes.
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NBS Specification Clauses. Complete, tailored NBS Chorus and NBS Create specification wording for every BASWA system and finish grade.
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Reflected Ceiling Plan (RCP) Coordination. Pre-construction reviews with architects and M&E contractors to resolve service clashes before boarding begins.
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On-Site Benchmarking & Quality Assurance. Sample panel sign-offs and moisture/substrate checks conducted by our accredited site managers across London, Cambridge, Oxford, Manchester, and nationwide.
BASWA phon Typical Build Ups
Each system is available in the following four system thicknesses: 30 / 40 / 50 / 70 mm.
All systems can be applied directly to concrete or conventional drywall systems (mineral substrates).
The glued and grouted BASWA Phon acoustic panels can be coated with either one or two layers of microporous acoustic plaster. The following surface structures are available:
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BASWA Base
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BASWA Fine
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BASWA Top
Roughest surface structure (Grain 0,7 mm) Average surface structure (Grain 0,5 mm) Finest surface structure (Grain 0,3 mm)
BASWA Phon acoustic systems can be designed as single-layer or two-layer systems (“Classic”). BASWA Top can only be used as a two-layer system “CLASSIC Top”.
BASWA Access Hatches
The BASWA inspection opening flaps are individually height-adjustable and already RAL9010 PUR-coated. A special breathable acoustic inlay in the door frame pre- vents the surfaces from ageing differently. It is important that the side connection between the outer frame and the substrate is sealed airtight beforehand. This prevents air from flowing through the adjacent acoustic system.
In addition, the commercially available height-adjustable products, which must be powder-coated beforehand, can also be used. The lid is coated with the primer and top coat and thus initially receives the same surface as the ceiling. To prevent different ageing of the surfaces, the lid can be fitted with a breathable acoustic inlay from BASWA. (Include inlay thickness 16 mm plus 2 mm coating.)
BASWA Alumium L Profile
L-angle profiles made of chromium steel, burn-in painted sheet metal, plastic or powder-coated aluminum can also be used for edge formation.
The L-brackets must be aligned to the required system thicknesses (30, 40, 50, 70 mm). This application provides protection against mechanical damage. With angle profiles that are exposed to heat radiation, there is a risk of cracking between the profile and the acoustic plaster. (Note coefficient of expansion aluminum, PVC or steel!)
BASWA Installation Platform
The BASWA IP is used for the partial installation of built-in elements with expan- sion springs, which require low construction thicknesses for fastening. The pressure-resistant nature of the IP prevents the edge of the ceiling cut-out from breaking out and reduces the need for wide cover rings.
The BASWA IP is based on a pressure-resistant, open-pored panel. The installation platform is calibrated to the respective thickness of the BASWA Phon acoustic panel and is available with or without opening cut-out.
200 mm x 200 mm for d < 140 mm
300 mm x 300 mm for 90 mm < d > 220 mm Other dimensions are available on request.
They are glued to the respective substrate, screwed mechanically as required and sealed airtight all around. The acoustic panels are then fully connected to the installation platform, the joints and screw holes are filled with BASWA Fill and ground at the same level.
Request CAD Details or Book a Technical Review
Need project-specific construction details, perimeter profiles, or substrate guidance for an upcoming specification? Contact our technical team or arrange a consultation at our Henlow Specification Centre.Call us on 01462 534610 or email baswa@arthuracoustics.co.uk to speak with an acoustic specialist.