Case study

The Hempcrete
PassivHaus.

Two years ago we joined the design team on the Hempcrete PassivHaus, working as PassivHaus consultant alongside architect Tim Fletcher and MES Building Solutions, then returning to spray the hempcrete ourselves.

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In progress · PassivHaus air test due by the end of 2026

The house sits on an insulated raft foundation by KORE, with a load-bearing timber frame designed and built by Turner Timber alongside the design team. The on-site contractor team installed hemp blocks from the Hemp Block Company on the inside of the frame, and the roof went on, insulated with hemp insulation and wood fibre above the deck.

Adyta started on site in August 2026, spraying hempcrete against the hemp blocks to infill the timber frame. The spraying was finished in September 2026. The hempcrete is now drying, ready to be rendered and timber clad. All airtightness products are from Ecological Building Systems, with lime plaster internally.

Next comes the PassivHaus air test, due by the end of 2026. The target is below 0.6 air changes per hour, so fingers crossed. After that the building will be monitored for performance, so watch this space.

Project team

Photos courtesy of the client and Adyta.

Insulated raft foundation slab laid on site, completed by others before the frame went up Load-bearing timber frame by Turner Timber going up on the slab, scaffolding around the perimeter Aerial view of the timber frame with the first airtightness membrane details in place Inside the timber frame, showing airtightness details where internal walls meet the external frame Thermally broken board lining a window opening in the timber frame, ahead of the hemp blocks Two-storey timber frame under scaffold, with hemp blocks going in ahead of the hempcrete spray Hemp blocks laid on the inside of the timber frame, forming the inner leaf of the external walls Window opening framed in thermally broken boards, set into the finished hemp block wall The Adyta team and site crew standing beside the spray machine at the start of the install First passes of sprayed hempcrete going onto the outside face of the hemp blocks Spraying hempcrete onto the wall from the scaffold, the hose looped over one shoulder and batten fixings set into the fresh hempcrete Two of the team spraying hempcrete against the hemp blocks from the scaffold Two of the team in dust masks spraying hempcrete side by side from the scaffold, the mix arcing onto the wall Close-up of hempcrete being sprayed from the nozzle into the timber frame Close-up of an operative in a dust mask and checked shirt aiming the spray gun low between the timber studs Spraying hempcrete up under the roof membrane at eaves level Freshly sprayed hempcrete wall with timber fixings protruding for the cladding battens Two of the team on the scaffold walkway, hempcrete spraying onto the wall as the hose curves over the rail Rough sprayed hempcrete finish along the scaffold walkway, fixings standing proud Full side elevation of sprayed hempcrete beneath the roof, seen from the scaffold Rear elevation with sprayed hempcrete complete, still under scaffold Aerial view of the roof with the windtight breather membrane going on Aerial view of the roof deck with wood fibre insulation being laid Internal finishes underway, with airtightness tape sealing around a window

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