Conservation & Heritage Issue 52 Summer/Autumn 2026 - Flipbook - Page 27
Benefits of silicate masonry paints on heritage buildings
Environmental conditions should be carefully monitored.
Application should only proceed when temperatures remain
consistently above 8°C (including overnight), with no rain
forecast during the curing period.
For contractors and specifiers working in the historic
built environment, silicate systems offer several practical
advantages:
•
High breathability: Vapour permeability allows
moisture to escape, reducing the risk of damp and salt
related damage.
•
Longevity: A service life of 15–20 years is typical, subject
to exposure and substrate condition, significantly
reducing maintenance cycles.
•
Chemical bonding: When used with a compatible
silicate primer, the paint forms a permanent bond
with mineral substrates rather than relying on surface
adhesion.
•
Ease of application: Compared with limewash, silicate
paints are more straightforward to apply while retaining
a traditional matt appearance.
•
Appropriate aesthetics: Carefully curated colour ranges
help maintain historically sensitive finishes.
When working over lime-based surfaces, the following
principles should be observed:
Ensure full curing: Lime render should be allowed
to cure fully before painting—typically one month per
5mm of thickness, longer in cold or damp conditions.
2.
Check surface integrity: Substrates must be sound,
stable and free from powdering or laitance.
3.
Specify breathable systems: All primers and finishes
must remain vapour permeable.
4.
Follow manufacturer guidance: Application rates,
dilution and curing times should be adhered to precisely.
Colour considerations in the historic context
Colour selection should support the architectural character
of the building and its setting. Age, regional traditions and
neighbouring properties all provide useful reference points.
Orientation also plays a role: north-facing elevations often
benefit from warmer tones, while south-facing facades can
accommodate cooler shades without appearing flat.
Preparation and Assessment
As with any conservation-led work, preparation is critical. All
loose, flaking or impermeable coatings should be removed,
and defects repaired using compatible materials. Light jet
washing can be useful both for cleaning and for revealing
unstable areas, but care should be taken to avoid damaging
delicate substrates.
I
1.
Earthborn’s Silicate Masonry Paint range offers 48
mineral-based shades designed to sit comfortably within
historic environments, providing a durable finish without
compromising visual authenticity.
Conservation & Heritage Journal
25
I
