Acoustic Insulation in Old Palma Buildings

Palma buildings built between 1900 and 1970 have an original Rw of 35-42 dB on party walls, far below the threshold of CTE DB-HR §2.1 (DnT,A ≥ 50 dB between dwellings). A self-supporting acoustic wall lining with CW48 framing + Isover Arena 45 mm + Placo BA13 (UNE-EN 520) board + Knauf KGT resilient band already reaches 48-52 dB; with Placo Silence on Stil F 530 chassis + Rockwool Alpharock 60 kg/m³ it rises to 52-62 dB for €58-95/m².

If you live in an old flat in Santa Catalina, the Casc Antic, El Terreno, Pere Garau or El Molinar and hear conversations, footsteps or music from your neighbour, the problem is not the volume: the original wall has insufficient mass (150-250 kg/m²) and no acoustic decoupling. At Plaquistas y Acabados SL we have delivered 6,000+ projects since 2004 and around 254 acoustic interventions/year (≈50% of our 508 projects in 2025), most on irregular marés walls in these districts.

This guide details Rw values, Placo/Knauf systems, €/m² prices and real results for 1900-1970 buildings. For a wider overview, see acoustic insulation in Mallorca.

Why Old Palma Buildings Have Low Rw

Walls built between 1900 and 1970 were not designed with acoustic criteria. NBE-CA-88 only arrived in 1988 and CTE-HR (DB-HR) came into force in 2007.

Build types and original Rw

1900-1940 (Historic Centre, La Lonja, Es Molinar): marés-stone masonry walls 30-40 cm. Mass 400-600 kg/m². Original Rw: 40-46 dB. Good in mid-low frequencies, but untreated blind boxes and shafts cut real Rw to 35-40 dB.

1940-1960 (historic Santa Catalina, upper El Terreno): mixed walls of 25-30 cm masonry plus 12 cm solid-brick partitions. Rw: 38-42 dB. Timber or steel joist floors with ceramic infill and no absorber.

1960-1970 (tourism boom, Son Espanyolet, Pere Garau): single hollow-brick party walls 4-5 cm (≈65-80 kg/m²). Rw: 33-38 dB. Pre-stressed joist and pot slab, 4 cm compression layer, no mineral wool.

For the regulatory detail, see our guide on the CTE-HR regulations in the Balearic Islands.

Common weak points

Roller blind boxes: 8-12 dB acoustic leak below the façade's theoretical Rw.
Pass-through socket boxes between dwellings: up to -5 dB per point.
Uninsulated downpipe shafts: flanking transmission of sanitary noise (30-38 dBA).
Wall-slab junctions with no resilient band: vibration bridge.

Palma Neighbourhoods with the Worst Issues

Santa Catalina

Housing stock 1960-1975, reinforced concrete frame, 4 cm hollow-brick party walls (Rw 33-38 dB). Bar and restaurant density 2015-2024 yields an ambient LAeq of 58-68 dBA at night (23:00-03:00), against the 45 dBA limit of Palma's Noise By-law for mixed residential zones.

El Terreno

1960-1980 buildings, many with ground-floor commercial units. The steep slope raises traffic noise by 3-5 dBA. Nocturnal LAeq measured in 2024: 55-62 dBA. Combined problem: weak party wall + exposed façade.

Casc Antic (Historic Centre)

17th-19th-century buildings with 50-80 cm marés walls (original Rw 48-55 dB by sheer mass). Interior refurbishments from the 1980s-90s with hollow-brick partitions drop Rw to 38-45 dB. The irregular marés calls for a self-supporting wall lining with CW48 set 10 mm off the wall + Isover Arena 45 mm + Placo BA13 + Knauf KGN perimeter band: it regularises the surface, restores the 50 dB DnT,A required by DB-HR §2.1 and needs no extra heritage permit (the façade is not touched).

Son Espanyolet, Pere Garau, El Vivero

Boom-era 1965-1980. Typical profile: concrete frame, 4-5 cm hollow brick, joist-pot slab, aluminium windows without thermal break and 4 mm glazing. Party-wall Rw: 33-38 dB. Impact L'nT,w: 72-78 dB.

Placo/Knauf Solutions for Old Buildings

A drywall lining weighs 25-40 kg/m² versus 100-150 kg/m² for a second brick leaf: critical on old slabs with tight load limits. Dry installation, no added moisture.

Solution 1: Placo Silence lining on Stil F 530 (party walls)

Self-supporting anti-vibration chassis Placo Stil F 530 or Knauf CW 75, with no direct contact to the existing wall. Isover Arena or Rockwool Alpharock mineral wool in the cavity. Placo Phonique or Knauf Diamant board.

System A (moderate upgrade): 48 mm chassis with 5 mm acoustic band. 40 mm Isover Arena (40 kg/m³). 13 mm Placo Phonique board. ΔRw: +10-13 dB. Thickness: 7.5 cm. €58-68/m².

System B (recommended, meets CTE DB-HR §2.1): 70 mm Stil F 530 / CW70 chassis with 5 mm EPDM band at all contacts (framing UNE-EN 14195). 60 mm Rockwool Alpharock (60 kg/m³, λ 0.035 W/m·K). Double 13 + 13 mm Placo Phonique board, staggered joints. ΔRw: +15-18 dB (final Rw 52-58 dB, DnT,A ≥ 50 dB in situ). Thickness: 10.5 cm. €72-85/m².

System C (partial box-in-box): Double independent chassis (10 mm gap). 80 mm Rockwool Alpharock (70 kg/m³). Double Knauf Silentboard 17.5 + 12.5 mm board with 3 mm Acoustiblok viscoelastic membrane. ΔRw: +20-24 dB (final Rw 58-62 dB). Thickness: 16-18 cm. €150-220/m² (box-in-box class).

Reference tests: UNE-EN ISO 10140-2 (lab) and UNE-EN ISO 16283-1 (field).

Solution 2: Anti-vibration false ceiling (impact noise)

Placo or Knauf ceiling suspended from the slab with Sylomer SR 18/SR 55 or Regupol Sonus Core dampers. Cavity filled with Isover Arena.

Standard system: Sylomer SR 18 suspension, 60 mm Isover wool, 15 mm Placo Phonique board. Airborne ΔRw: +12-15 dB. Impact ΔL'nT,w: -15 to -18 dB. Headroom loss: 12-15 cm. €62-78/m².

Reinforced system: High-performance Sylomer SR 55 suspension, 80 mm Rockwool (60 kg/m³), double Knauf Silentboard 12.5 + 12.5 mm board. Airborne ΔRw: +16-20 dB. Impact ΔL'nT,w: -18 to -22 dB. Headroom loss: 15-18 cm. €82-98/m².

More info in drywall false ceilings in Mallorca.

Solution 3: Weak-point treatment

Pass-through socket boxes: relocate sockets onto the new board and seal the original gap with Promat PROMASEAL acoustic mastic. ΔRw: +3-8 dB per point.

Roller blind boxes: Isover Arena 40 mm panel + drywall inspection hatch. Cost: €90-160 per box.

Junctions and joints: flexible acoustic mastic, Sika Acoustic or similar. Full perimeter sealing: +2-4 dB overall.

Typological Pattern: 1960-1975 Apartments in Santa Catalina

Typical building and flat

4-6 storey buildings with reinforced-concrete frame, 4 cm hollow-brick party walls (original Rw 33-38 dB) and pre-stressed joist/pot slabs without absorber. Flats of 60-90 m².

Common starting point (UNE-EN ISO 16283-1 measurement)

Party-wall Rw: 33-38 dB
Impact L'nT,w from floor above: 72-78 dB
Indoor nocturnal LAeq (weekend in Santa Catalina): 40-45 dBA

Typical post-intervention results

Party-wall Rw: 50-54 dB (ΔRw +15-18 dB). Meets CTE-HR DB-HR §2.1.
Impact L'nT,w: 58-63 dB (Δ -14 to -18 dB).
Nocturnal LAeq: 35-37 dBA (Δ -5 to -7 dB).

Indicative financial ranges

Party-wall box-in-box lining: €140-180/m²
Anti-vibration ceiling: €170-210/m²
Weak-point treatment: €600-900 depending on quantity
Common total for 70-80 m² flat: €7,500-9,500 (VAT separate)
Average timescale: 5-7 working days

Considerations for Old Buildings

Slab loads

1960-1980 slabs take 100-150 kg/m² live load. A double lining weighs 28-42 kg/m² and a Knauf Silentboard false ceiling 18-24 kg/m²: comfortable margin. On timber slabs (1900-1940), check condition first.

Floor-area loss

System B (10.5 cm) on a 3 m wall: -0.32 m². System C box-in-box (18 cm): -0.54 m². In 50-60 m² flats, weigh the space-vs-comfort trade-off.

Ceiling height

Old Palma flats: clear height 2.50-2.75 m. Sylomer false ceiling takes 12-18 cm, leaving 2.32-2.57 m. Palma's by-law requires 2.50 m in main rooms; exceptions are allowed for acoustic refurbishment with a technical project.

Heritage protection

Palma Town Hall's Protection Catalogue regulates façades in the Old Town. Interior interventions (lining, false ceiling) do not require additional heritage permits.

What to Expect to Spend by Neighbourhood

Accessibility drives cost. Historic Centre (narrow streets, no lift): +10-20% over standard prices. Pere Garau, Son Espanyolet, El Vivero: standard ranges.

70-80 m² flat, party wall + bedroom ceiling intervention: €4,800-8,600. Full breakdown in the soundproofing price guide for Mallorca.

For a specific figure, see drywall in Palma or request a free quote.

Next Step: On-site Acoustic Measurement

Free pre-works UNE-EN ISO 16283-1 measurement: we document current Rw, impact L'nT,w, ambient LAeq and transmission paths. Technical proposal with target Rw and a fixed quote.

Request your acoustic assessment or call 627 829 723. Full info at acoustic insulation in Mallorca.