Selecting the correct plaster shapes workmanship, cost control, and the finish occupants will live with for years. With choices spanning lime, gypsum and cement, suitability depends on location, substrate, programme, and the performance required for the space.
Interior Versus Exterior Considerations
Interior rooms often favour gypsum for speed and a smooth, paintable surface. Lime supports breathability in older properties, allowing moisture to migrate through the fabric.
Exposed facades typically call for cement mixes with waterproofing additives for durability in the British weather. For a broader context on building fabric and moisture, see guidance on preventing condensation.
Types and Performance Features
Gypsum suits bedrooms and offices, delivering crisp edges and efficient snagging. Lime offers lower embodied carbon and natural antibacterial qualities for heritage work. Cement resists rain and impact on plinths and garages. Acoustic and thermal formulations improve comfort in mixed-use spaces, while fire-rated plasters support compliance.
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Practical Selection Checklist
Confirm where the finish will sit, the base material, and the required resistance to moisture, sound, or fire. Test a small area first, maintain an even thickness, and mix only what can be applied within the working time. Keep surfaces clean, prime as specified, and avoid over-trowelling that can burnish or weaken the coat.
Record the outcomes and refine the method so the chosen plaster meets expectations across the programme. Allow adequate curing time, protect fresh coats from rapid drying, and schedule trades to avoid accidental damage between passes later.
