Soundproofing a gypsum wall in a Maltese flat

Start with the uncomfortable part: there is no standard

If you have come from the UK, you are used to a builder being able to say that a wall meets a number. In Malta no one can say that, because there is no number.

The Kamra tal-Periti's 2020 framework document, A Modern Building & Construction Regulation Framework for Malta, states that Malta has no regulations to curb noise generation or to limit its impact within buildings. Sound insulation appears in that document as a component of future guidance, not current law. Environmental noise — the noise outside, from traffic and industry — is covered separately under S.L. 549.37 (LN 193 of 2004), administered by ERA, but that regulates the environment, not the wall between you and the flat next door.

So when a quotation tells you a partition is "soundproof" or "compliant", there is nothing for it to be compliant with. What you can specify is construction: stud depth, number of board layers, cavity infill, sealant, finish. What you cannot buy here is a certified performance figure.

The legal position behind the complaint is similarly thin. A 2016 University of Malta LL.D. dissertation on neighbourhood noise found the Maltese framework fragmented and indirect, the courts inconsistent, and injunctions granted only in grave cases — and noted that a 2012 White Paper had still produced no concrete rules four years later. Matters have been moving slowly: MaltaToday reported in January 2024 that ERA was looking for experts to carry out a study that would include acoustic design guidelines for new and existing homes in noise hotspots, Malta having committed to cutting the share of people chronically disturbed by transport noise by 30% by 2030. The same report notes that 2016 noise mapping found 24% of the agglomeration population exposed to road noise above 55 dB.

Those thresholds matter for calibrating your own expectations. The Kamra tal-Periti document cites WHO findings that average night-time noise above 40 dB disturbs sleep, and that long-term exposure above 55 dB is linked to raised blood pressure. That is the scale of the problem you are trying to move.

Which wall are we actually talking about?

In a typical Maltese flat the wall you share with the neighbour is masonry — limestone or concrete — and the gypsum work is internal: stud partitions dividing bedrooms, dry-lining on the inside face of an external or party wall, and false ceilings under the slab. This distinction decides what is realistic.

• A new stud partition inside your own flat. You control the whole build-up. This is where specification works best.
• A dry-lining added to an existing masonry party wall. You are adding mass and a cavity to something you did not build and cannot inspect. Improvement is possible; prediction is not.
• Noise arriving through the slab, the shaft, the stairwell or a shared duct. No wall treatment fixes this. Work on the wall and the noise will keep arriving by the route you did not touch.

Be honest with yourself about which of the three you have before spending anything.

The specification a Maltese tender already uses

The clearest Maltese-authored description of a quieter gypsum partition in public circulation is the 2015 bill of quantities for the Malta Life Sciences Park (ref. MLSC/FIN/GYP/BOQ/08/15). Its partition item specifies:

• 50 mm studs
• two layers of 12.5 mm board on both faces
• taped joints
• polythene acoustic sealant
• a skim coat finish
• rockwool infill, described as "to 50 dB", priced as an extra-over per square metre

That build-up contains the three things that do the work, in order of effect: mass (four board layers rather than two), sealing (the acoustic sealant at perimeters and the taped joints), and absorption (the wool in the cavity). The sealant is the item most often dropped on site and the one most likely to waste the rest of the money — an unsealed gap at the head, the skirting line or around a socket will leak sound straight past four layers of board.

Note what the tender does not say. "To 50 dB" cites no test standard, no board specification and no wool density. Read it as an instruction to the contractor, not as a performance warranty.

The UK numbers, clearly labelled as foreign

These are from Approved Document E (England and Wales). They are not Maltese law and nothing in Malta enforces them. They are here only so you know what a measured target looks like.

Two cautions. The separating-element figures are site-measured; the Rw 40 dB figure for internal walls is a laboratory value, and the two are not interchangeable. And the internal-wall figure, 40 dB, is the one most relevant to a bedroom partition in a flat — it is a modest target, and a double-boarded insulated stud wall is the kind of construction aimed at it.

Materials, at Maltese prices

A Maltese gypsum store publishes these retail rates:

A 1.2 x 0.6 m rockwool sheet covers 0.72 m² of wall; a 1.2 x 12 m glass wool roll covers 14.4 m². The store listing does not give board sheet dimensions, so a per-square-metre board cost cannot be worked out from it honestly. What is plain from the tender spec is that double boarding both faces means four board layers per square metre of partition rather than two — the material cost of the board roughly doubles, and so does the handling.

No Maltese source publishes an installed price per square metre for this work. The Malta Life Sciences Park bill of quantities has the specification but blank rate columns. Anyone quoting you a figure is quoting their own figure, not a published market rate.

Constraints particular to a flat here

Clear height. A dry-lining takes depth off the room and a false ceiling takes it off the height. If you are at or near the 2.60 m clear-height requirement in LN 227/2016, a double-boarded ceiling build-up is a dimension to check before it is a specification to order.

Condominium. Party walls, slabs and shafts are common parts under Cap. 398. Fixing an independent lining back to a shared element, or opening up anything that is not yours, is a condominium matter and not a decision for a contractor on site.

Shell form. Buying in shell makes this far cheaper, because the partition can be built right the first time rather than stripped and rebuilt. The acoustic decisions are made at first fix, not at skim.

Gozo. Four board layers per square metre plus wool is a lot of volume for a wall. Every delivery crosses on the ferry, and a shortfall is a day lost, not an hour — order the full quantity, including sealant, at the outset.

Who does it. There is no trade licence for plastering in Malta, so verification is the buyer's job. Ask to see the specification written out — stud depth, layers, wool, sealant — on the quotation itself. If it is not written down, it will not be built.

What a reasonable brief looks like

1. Decide whether the noise is coming through the wall you intend to treat, or through the slab, shaft or stairwell.
2. Specify construction, not performance: 50 mm studs, two layers of 12.5 mm board each face, mineral wool infill, taped joints, polythene acoustic sealant at all perimeters, skim finish.
3. Price the wool as a separate line, the way the Maltese tender does, so you can see what it costs.
4. Accept that no Maltese figure, test or certificate exists at the end of it. If you want measurement, you are buying a private acoustic test against a foreign standard, with nothing in Maltese law behind the result.

That is the whole honest position: a well-built double-boarded insulated partition with sealed perimeters is a real improvement, and nobody in Malta can tell you in decibels how much.