Guide
Decorating period plaster: lime, patches and lining paper
A wall in a converted Victorian house is usually three or four different materials wearing the same colour.
What is actually on the wall
Original lime plaster on riven lath, gypsum patches from a previous repair, filler over old fixings, and somewhere under it all a coating nobody recorded. Each of those takes paint differently, which is why a period room that has been rolled with two coats of emulsion so often looks patchy in raking light.
Preparation is therefore the specification rather than a preamble to it. Establishing what is sound, what has lost its key and what has to come off is the first substantive piece of work, and it happens wall by wall rather than room by room.
Lime, and why it is worth keeping
Sound lime plaster is worth retaining. It is breathable, it is part of how a solid-walled building manages moisture, and replacing it wholesale with a hard gypsum skim changes how the wall behaves. A skimmed wall over damp lime tends to crack along the laths within a couple of years.
Where lime has blown in patches it can be re-fixed and made good in compatible materials. Where it has failed comprehensively, replacement is the honest answer. That judgement is made by testing adhesion in a few places, not by assuming either outcome.
When lining paper is right, and when it is a shortcut
Lining paper earns its place where a wall is sound but cosmetically uneven — fine crazing, historic movement, a patchwork of repairs — and where the alternative is a full re-skim that the wall does not otherwise need. It bridges hairline variation and gives a consistent surface for paint.
It is a shortcut when it is used to cover something that needed fixing: a live crack, a damp problem, or plaster that has lost its key and will take the paper off with it. Lining is written into the proposal with a reason attached, not added on the day to save preparation.
Coatings and sequence
New or exposed plaster takes a mist coat before finish coats, thinned so it soaks in rather than sitting on the surface. Where breathability matters — solid walls, older lime — the finish is chosen to suit rather than defaulting to whatever is on the van.
Decoration is the close of a programme, not the first trade on site. Where a kitchen, bathroom or floor is also being done, painting follows them so that a late plumber is not cutting into a finished wall. In an occupied house rooms are sequenced so that a bedroom and a bathroom stay usable throughout.
Questions
We can get close, but honestly: a faded wall and a fresh tin of the original colour will not match, because what has faded is the paint on the wall rather than the reference. Where a single wall is being redecorated in an otherwise untouched room, we will say if the result is likely to read as a patch, and usually recommend taking the whole room instead.
Per room rather than as a policy. Empty rooms with a lot of flat wall can take spray, which is cleaner and faster. Furnished period interiors with original joinery, cornices and mouldings generally take brush and roller, because masking to a good standard costs more time than it saves. We decide with the room in front of us.
The work this applies to
Where this comes up
Related guides
- Original sash windows: decorating them as joinery
A sash window that sticks, rattles or will not stay up has a joinery problem, and no amount of paint is the answer to it.
- The order of works in a light refurbishment
In a whole-flat programme the sequence is the thing you are buying. Everything else is materials and labour.