Hempcrete Infill

Hemp shiv and lime cast around a timber frame as an insulating infill, tamped in lifts. Breathable and vapour-open; the timber frame is the structure.

Carbon and evidence

How This Is Made

An Environmental Product Declaration is issued by a manufacturer against a declared unit. This record has neither, so it states sourced facts about process and provenance instead of a carbon figure.

No published figure held

The same cast-in-situ technique as hemp-lime walling, specified as frame infill

Process

Feedstock

Plant fibre

Hemp shiv bound with a formulated lime binder

Process heat

Calcined

The lime binder is calcined at roughly 900 C. Carbonation reabsorbs CO2 over the life of the wall. Both are stated; neither is netted against the other, and no figure is claimed.

Binder

Lime

Fabrication

Site-formed

Sourcing: national to European

Who Builds It

Trained contractor

Limited UK availability

Drying time governs the programme; finishes cannot follow immediately

End Of Life

Separable

Broken out from the frame; the frame itself is recoverable

Maintenance: Vapour-open finishes only

Specification Risk

What a specifier has to resolve before this can be built.

Certification: No Agrement for the buildup; binder suppliers hold their own test data
Fire: Confirm the tested buildup and finish rather than assuming a classification
Warranty: Workmanship warranty only
Insurance: Confirm warranty-provider acceptance early
Supply: Limited contractor base

Read This Honestly

•Hempcrete is not structural — the record was renamed from "Hempcrete Structural" on 3 August 2026 for exactly this reason.
•Not a block product. Cast in situ, with no declared unit.