Interactive layer guide

Explore every layer

Each component has a job in plain English, then the numbers. Select a layer on the diagram to see thickness, lambda, Sd and guide price.

Floor

Hotspots follow the logo: cyan, amber, coral.

Existing masonry Outside

Room Inside

Selected layer

PerliTherm

The breathable insulating body of the wall system: expanded perlite bound with hydraulic lime.

Thickness: 50mm
Lambda: 0.064 W/m·K
Sd: 0.2 – 0.4 m

Guide price · ex. VAT · supply only £45.00 /m²

17th-century Cotswold farmhouse

Bare brick bedroom with a retained lath ceiling, Upper Park Street, Cheltenham, before the breathable lining

Historic property · Cheltenham

Bedroom renovation, Upper Park Street

Breathable internal thermal upgrade to bare brick walls and a retained lath ceiling using PerliScratch, AeroBond, mesh, and PerliTherm, improving surface warmth and reducing condensation risk while preserving historic fabric.

Walls −46%
Ceiling −38%
PerliTherm 25mm