Decorating Gloucester Gate

Gloucester Gate was designed by John Nash and built in 1827 by Richard Mott as one of the smaller terraces in the Regent's Park perimeter scheme. Named after the Duchess of Gloucester, the terrace occupies a position on the north-eastern boundary of the park, adjacent to the Regent's Canal and the landscaped gardens of the park's inner circle. Unlike the monumental compositions of Chester Terrace or Cumberland Terrace, Gloucester Gate comprises just eleven houses in a relatively compact range, with a simpler architectural treatment that reflects its position away from the principal park approaches. Nevertheless, the terrace was built to the same high standard of construction as its grander neighbours, with lime stucco facades, Roman cement enrichments, and finely detailed timber joinery. The terrace's history has been less eventful than some of the larger park terraces: it escaped serious war damage and has been subject to regular cyclical maintenance under Crown Estate management. However, its north-facing orientation and proximity to the Regent's Canal create a particular microclimate characterised by reduced solar gain, elevated humidity, and persistent shade from mature park trees, all of which influence the performance and maintenance requirements of the stucco facades and their coating systems.

The conservation painting of Gloucester Gate's north-facing stucco facades must specifically address the moisture and biological colonisation challenges created by the terrace's orientation and microclimate. Before any painting, the facades should be treated with a biocidal wash to eliminate algae, lichen, and moss colonies: a quaternary ammonium compound applied by low-pressure spray and allowed to dwell for seven to fourteen days provides effective kill without damaging the lime substrate. Dead biological matter should then be removed by gentle bristle brushing, and the surface allowed to dry thoroughly before further treatment. The recommended finish specification is a silicate mineral paint system incorporating a biocide-enhanced formulation, such as Keim Granital with algicide additive, which provides the standard silicate benefits of chemical bonding and vapour permeability while also inhibiting biological recolonisation. The paint should be applied in two coats, with the primer coat diluted to enhance penetration into the porous lime substrate, equalising absorption and providing a uniform base for the finish coat. Particular attention should be paid to areas where the facade is sheltered by overhanging cornices, balconettes, or adjacent tree canopy, as these are zones of greatest moisture retention and biological risk. Stucco repairs should employ a hydraulic lime mortar with a slightly higher hydraulic set than would be used on a south-facing facade, typically NHL 3.5 rather than NHL 2, to provide faster carbonation and improved moisture resistance in the persistently damp conditions. Roman cement enrichments should be consolidated with nanolime where powdering is evident and repaired with a compatible natural cement or pigmented NHL mortar. Timber joinery, though less affected by UV degradation on this north-facing facade, is more susceptible to moisture-related decay and fungal attack: a preservative treatment with a boron-based product should precede the standard linseed oil primer and alkyd finish system, with particular attention to the horizontal surfaces of sills, transoms, and meeting rails where water tends to pool.