TESTING STAGE
LCR · 2026
H
Breathable insulating render · North West England

HESTACAL

Something old buildings have been waiting for.
Britain's old walls deserve better
than the damage being done
in the name of insulation.
A new material is in development. Breathable by design. Built for solid-wall and heritage buildings where the standard approach traps moisture, causes structural damage and gets called retrofit.
Development & testing active · Liverpool City Region

In development

Hestacal Evolution™
& Barrier™

0.060
Target W/mK
Conductivity
UKAS testing underway
~52%
Heat loss reduction
vs. bare brick at 40mm
modelled figure
NHL2
Lime matrix
Vapour-open
No cement, no boards
BBA
Certification path
PAS 2035 / TrustMark
eligibility on cert.
Get in touch
Stay informed
✓  We'll be in touch when the time is right.
North West England · Liverpool City Region
contact@hestacal.co.uk
hestacal.co.uk Breathable insulating render