Hempcrete Wall Monitor

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Carbon Footprint

Estimated — awaiting EPDs

— kg CO₂e/m² · whole building

— less than conventional (—)

Carbon methodology

Approach

Carbon balance is calculated from the mass of each bio-based material installed, multiplied by a carbon factor (kg CO₂e per kg of material). Sequestered carbon is negative (stored), embodied carbon is positive (emitted). The net balance is the sum of all materials.

Intensity

Net balance is divided by the building's gross floor area (41.8 m² / 450 ft²) to give kg CO₂e/m² — the industry standard metric for comparing buildings regardless of size.

Scope

Covers the full envelope and substructure: hempcrete walls, HempWool roof insulation, PlantPanel rigid board, lime render, roof cladding (steel standing seam vs composite shingle), and concrete slab-on-grade with perimeter foundation. Roof structure (timber) is identical in both scenarios and excluded.

Materials

iSoCANNA Hemp Hurd

−1.60 kg CO₂e/kg. Primary carbon sequestration carrier in the hempcrete mix. Factor estimated from published hempcrete LCA literature. Awaiting iSoCANNA EPD.

Batichanvre Binder

+0.40 kg CO₂e/kg. Saint Astier natural hydraulic lime binder. Embodied carbon from lime calcination, net of ~25% CO₂ reabsorption via carbonation over time. Awaiting Saint Astier EPD.

HempWool (Hempitecture)

−1.80 kg CO₂e/kg. 90% hemp fiber batt insulation. Carbon negative — biogenic uptake exceeds manufacturing emissions. Based on Hempitecture LCA (University of Idaho, 2023).

PlantPanel X (Hempitecture)

−1.40 kg CO₂e/kg. 100% biobased rigid continuous insulation board. Factor estimated from biobased rigid board LCA data. Awaiting Hempitecture EPD.

Saint Astier NHL Render

+0.30 kg CO₂e/kg. Natural hydraulic lime render applied at 6mm to interior wall faces only. Net factor after ~25% carbonation reabsorption.

Steel Standing Seam Roofing

+2.50 kg CO₂e/kg. Cold-rolled galvanised steel. High embodied carbon at manufacture but 50+ year lifespan and fully recyclable. ~217 kg installed.

Ready-Mix Concrete (Low Carbon)

+0.104 kg CO₂e/kg. 4" slab-on-grade + 12"×12" perimeter foundation beam. 15,841 kg total. Low carbon mix design 608-118LC: Type II cement + 30% Class F fly ash substitution.

Status

Estimated

All carbon factors are currently estimated from published LCA literature. No verified EPDs are in use. Values will be updated as EPDs become available from Saint Astier, Hempitecture, and iSoCANNA.

Energy Consumption

kWh/m²/yr by end use — shorter is better

Cure Rate Trend All walls cured ✓

● South ● West ● North ● East

Historical drying rate · %/day · curing journey now complete

Room Signatures

Thermal Mass Performance

Bedroom

South + West walls · 1,080 ft³

Lag

—

hrs

Damping

—

Decrement

—

ISO

Signature

—

Bathroom

West + North walls · 648 ft³

Lag

—

hrs

Damping

—

Decrement

—

ISO

Signature

—

Living / Kitchen

South + East + North walls · 2,880 ft³

Lag

—

hrs

Damping

—

Decrement

—

ISO

Signature

—

What is a room signature?

Temperature

● South ● Exterior ● West ● North ● East ⊹ Interior

Humidity

● Exterior ⊹ Interior

Moisture

● South · Sept 25 ● West · Feb 26 ● North · Feb 26 ● East · Feb 26

Air Quality · PM2.5

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