WTA Certified · Heritage Specialists · Breathable System

Cut heating bills without degrading your heritage property

A breathable insulation system for older solid-wall buildings, improving thermal performance with minimal build-up while respecting moisture movement and traditional construction.

Vapour-open mineral insulation for pre-1919 buildings. Your walls and floor can breathe while your home stays warm.

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65% average reduction in heat loss
London stock brick terrace with a white stucco ground floor, arched doors and iron balconies

About you

Tailored support for every enquiry

Each path is different. Every outcome is the same: a better, healthier, more efficient building.

Owners

Future-proof your heritage building.

Reduce energy bills and eliminate damp without compromising the character or fabric of the construction.

Book free assessment

Architects & Conservation Officers

Specify the most sensitive buildings.

Full technical support from design stage to site sign-off and LPA approval.

Get the technical pack

Installers & Contractors

Join the approved installer network.

The UK’s 5.9 million pre-1919 buildings are waiting to be retrofitted properly. First in your area.

Become certified

Interactive layer guide

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

Internal walls

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.

Explore every layer
London stock brick terrace with a white stucco ground floor, arched doors and iron balconies

External walls

Internal insulation does not typically require planning permission as it doesn’t alter the building’s external appearance.

External walls

Floors

The vapour-open insulated floor finish.

Floor

Proof of performance

Grade I listed Cotswold stone farmhouse and outbuilding in pasture, Gloucestershire

17th-century Cotswold farmhouse

Solid stone walls, cob partitions and original lime plaster. Significant thermal improvement achieved while satisfying Historic England’s strictest requirements.

Grade I listed · Gloucestershire

Insulation that works with your walls, not against them.

BreatheTherm breathable insulation is specifically formulated for pre-1919 and listed buildings.

See the BreatheTherm solution

What our clients say

The work was carried out quickly and with a minimum of disruption or mess.

What our clients say

Built on a combined 45 years of heritage experience

Two practitioners who watched conventional insulation fail in period houses, then built the system they needed.

Meet the team

Free assessment

Book a free assessment

Speak to a heritage retrofit specialist. No obligation. Clear advice tailored to your building type, age, and any conservation requirements.

01285 407088

hello@breathetherm.co.uk

  • Callback within one working day
  • No hard sell
  • Conservation specialists

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