Chatham Historic Dockyard: Sympathetic Drylining for Grade II Listed Maritime Buildings

The Chatham Historic Dockyard sits on the west bank of the River Medway, directly across from Gillingham in ME4. It is the best-preserved Georgian naval dockyard in the world, a 26-hectare site of over 100 listed buildings, scheduled Ancient Monument ground, and working maritime heritage that has been continuously occupied since 1567. For a Gillingham drylining contractor working on the site, that combination is both an opportunity and a constraint: anything we fix to the fabric has to be reversible, vapour-permeable where the substrate is historic, and approved by Medway Council's conservation officer before a single board goes up.

This guide is the long-form version of how we approach sympathetic drylining on Dockyard projects, what the conservation officer actually wants to see on a method statement, and where modern plasterboard systems genuinely help the building perform better without harming what makes it special.

Why the Dockyard is a special case for drylining

The site was operated as a Royal Navy dockyard from 1567 until 1984. The Georgian phase, built roughly between 1700 and 1830, is what most visitors see: the Commissioner's House of 1704 (the oldest surviving naval building in England), the four-storeyed Mast Houses and Mould Loft of 1753 to 1755, the 346-metre Double Rope House, and the cluster of covered slips built between 1817 and 1851 to protect ship timbers during construction. Most of those are listed at Grade I or Grade II*, and the whole site sits within the Brompton Lines Conservation Area adopted by Medway Council in 2006.

When a client asks us to install a partition, line a wall for acoustic separation, or add a layer of insulated plasterboard to one of these buildings, three things govern every decision we make:

• Listed building consent from Medway Council before any work that affects the character of a listed structure, including new internal partitions, surface finishes, or insulation upgrades applied to historic fabric.
• Scheduled Monument consent for any groundworks or anything touching monument-fixed elements, which a surprising number of internal works can interact with.
• Reversibility, the conservation principle that every modern intervention should be removable without damaging the historic fabric underneath. Mechanical fixings into Georgian brickwork need a conservation-officer-approved fixing strategy, usually stainless-steel resin-anchored studs, never plastic plugs in lime mortar.

The buildings most commonly re-lined at ME4

In practice, the drylining work on the Dockyard clusters around a handful of building types. Knowing which one you are in dictates the spec.

Georgian mast ponds and mould lofts

The South Mast Pond (1697) and North Mast Pond (1702) were used to season fir logs by immersing them in salt water while the sap died back. The Mould Loft above the masthouses was where the full-size lines of HMS Victory were laid down. These spaces have thick load-bearing masonry walls, lime-based internal finishes, and floor structures that cannot accept the point loads of modern stud framing. We specify a free-standing metal stud partition on a slim sole plate, with no mechanical fixings into the historic floor, and a vapour-permeable plasterboard finish so the masonry can still breathe.

Covered slips Nos 1 to 7

Five new covered slipways were added between 1836 and 1851, replacing the original 1817 timber slips. The slip covers removed from Woolwich Dockyard after its closure in 1869 were re-erected at Chatham and still stand today. These are large-span Victorian iron-and-timber sheds, often repurposed as event venues, film locations (Call the Midwife, Mr Selfridge, and Sherlock Holmes: A Game of Shadows have all filmed here), and commercial tenants. The acoustic challenge in a covered slip is the 12 to 15 metre reverberation time off the iron roof deck, and the thermal challenge is the uninsulated corrugated skin. We typically install a 92mm metal stud with 50mm mineral wool, two layers of 12.5mm acoustic plasterboard, and a separate insulated plasterboard lining to the perimeter walls.

The Anchor Wharf and Ropery complex

The Double Rope House is 346 metres long and, when completed, was the longest brick-built building in Europe capable of laying a 1,000-foot rope. It still houses Master Ropemakers Ltd, a working ropery. Any partition inside the Ropery has to respect the original brick piers, the timber tension structure, and the operational needs of the tenants. Lightweight galvanised steel stud with a single layer of 15mm plasterboard, finished with a breathable skim, is usually acceptable because it adds minimal load to the existing piers.

What Medway Council's conservation officer will want to see

Listed-building consent applications for the Dockyard go through Medway Council's planning team at Gun Wharf, Dock Road, Chatham. We have found, across a number of ME4 conservation projects, that the conservation officer's method-statement checklist boils down to four things:

• A fixing strategy. What is being fixed into what, with what fastener, and how it is removed at end of life. Plastic wall plugs in lime mortar will get a rejection letter.
• A vapour-permeability statement. Historic masonry walls need to dry to the inside. A sheet of foil-backed plasterboard against a Georgian brick wall traps moisture and will eventually blow the lime plaster off the other side.
• A finish sample. Conservation officers want to see the finished surface, including any tape-and-joint texture, before the full run is done.
• A heritage impact statement. How the work affects the significance of the listed building, however briefly, in plain English.

Building Regulations still apply

A listed-building consent is a planning permission. It does not replace Building Regulations. For the Dockyard, every drylining project still has to satisfy Approved Document B (fire safety), Document E (sound), and Document L (conservation of fuel and power). That creates real tension on heritage projects, because the simplest way to hit a Part L U-value is to wrap the building in 90mm of insulated plasterboard, and the easiest way to satisfy Part E is to fill a stud cavity with dense mineral wool. Both can be done sympathetically, but only with the right build-up.

For fire, the masonry piers and brick arches of the Georgian buildings usually give you 60 minutes' fire resistance by themselves. Where we add a partition that needs to maintain a fire line, we use two layers of 12.5mm fire-rated plasterboard on a 70mm metal stud with a minimum 50mm of rock wool in the cavity, all sealed with intumescent acrylic at perimeter and penetrations. For acoustic separation between adjoining commercial tenants in the Victorian Steam Yard, a 100mm stud with two layers of 15mm acoustic plasterboard each side, plus a 50mm rock wool cavity, comfortably hits the 43 dB Rw target for office-to-office.

Thermal upgrades without losing the breathability of the wall

The most common request we get on Georgian buildings is some form of insulated drylining to the external walls, because single-leaf brick 1.5 metres thick is still surprisingly cold. On a non-listed building, we would usually reach for a 60mm or 70mm foil-backed insulated plasterboard. On a Grade II* listed building inside the Brompton Lines Conservation Area, the conservation officer will almost certainly reject any foil-back, on the grounds that it prevents the masonry from drying inward.

The sympathetic alternative is a 50mm calcium-silicate or wood-fibre insulation board bonded to the masonry with a lime-based adhesive, mechanically fixed with stainless-steel resin anchors at agreed centres, and finished with a vapour-open plaster skim. The thermal performance is lower than a foil-backed board (around 0.5 W/m²K rather than 0.25), but the wall can still dry, and the work is removable.

Practical sequencing on a Dockyard fit-out

Because the site is a working tourist attraction, school trip destination, and commercial tenant hub, sequencing matters. Most projects we have worked on run in this order:

1. Pre-start meeting with the Historic Dockyard Chatham site team to confirm access, vehicle routing, and the published visitor opening hours. The site has very limited vehicle access, and deliveries need to be booked through the Dock Road entrance.
2. Method statement and fixing-strategy submission to Medway Council if consent has not yet been issued. Standard turnaround is eight weeks for listed-building consent on a major building.
3. Setting-out using the original pier lines, not modern grid lines, so new partitions sit between the structural bays rather than across them.
4. First-fix mechanical and electrical, with cabling run inside the stud cavity, never surface-mounted on historic surfaces.
5. Plasterboard linings, taped and jointed, finished with a breathable skim where the substrate is historic.
6. Final inspection with the conservation officer and a sign-off photograph for the building's maintenance file.

Costs and programme for a Dockyard project

Heritage projects cost more than standard commercial fit-outs, principally because of the longer lead time on consents and the more expensive materials. As a rough guide for a ME4 project inside the conservation area:

• A free-standing metal stud partition with a single layer of 12.5mm plasterboard, taped and jointed, typically £45 to £60 per m² installed.
• A two-layer acoustic plasterboard build-up on a 100mm stud, Part E compliant, typically £85 to £110 per m².
• A sympathetic calcium-silicate insulated lining to a Georgian external wall, typically £70 to £95 per m², depending on board thickness and finish.
• Conservation officer fees and listed-building consent application fees are additional and depend on the value of the work, but Medway Council publishes its current fee schedule online.

Programme-wise, allow eight to twelve weeks for consent on a major building, and two to four weeks on site for a single-room partition, scaling up with the size of the fit-out. We are happy to scope a specific ME4 project and give you a fixed price once we have seen the building.

Why use a Gillingham crew for Chatham Dockyard work

The Dockyard is a fifteen-minute drive from the centre of Gillingham, and we have been working across Medway's heritage sites for years. Being local means we know Medway's conservation team, we know how to route deliveries through Dock Road without disrupting the tourist trade, and we have operatives who have worked on similar Georgian and Victorian buildings in Brompton and Chatham town centre. Every job is run by a CSCS-carded supervisor with a current SMSTS or SSSTS, and we carry £2 million public liability insurance as standard.

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