Flowable hempcrete insulation
Biofill™ is a pourable insulation that hardens in under an hour, keeps rooms comfortable, and locks carbon into your walls instead of the atmosphere.
For new builds, renovations & retrofits — direct or through a certified installer.
Add a code-compliant, carbon-negative wall system to your bids. Simple and easy training.
Spec a wall with the R-values, fire ratings, and testing data to defend the decision in review.
A healthier, more efficient home. Built to last for centuries, while saving you money.
Biofill™ is a flowable hemp-lime insulation. Natural, non-VOC materials mixed and poured straight into standard wall framing. No spraying. No tamping. No stacking. No air gaps. No pests. It hardens into a solid, breathable wall in under an hour, and it keeps storing carbon for as long as the building stands.
30–50% faster than traditional cast in place hempcrete or block, while using standard mixing and pouring equipment.
Class A fire rating with no added flame retardants, and resistant to mold and pests without chemical treatment.
Breathable and moisture-regulating, with zero VOC off-gassing.
Sequesters roughly 2 lbs of CO₂ per 1 lb of installed material, for the life of the building.
See our revolutionary flowable hemp Biofill™ in action. Watch how it can be formed and placed in a fraction of the time, with performance that rivals traditional insulation materials.
| Attribute | Biofill™ (Flowable) | Spray Foam | Traditional Hempcrete |
|---|---|---|---|
|
Install method |
Poured into standard wall framing; hardens in 45–60 min |
Sprayed into cavity; several hours to fully cure |
Hand-mixed and tamped into forms, days per wall section |
|
Cost |
~$4.52/cu ft material |
~$6–$8/cu ft installed |
~$8–$12/cu ft (material + labor) |
|
Carbon impact |
Carbon-negative |
Carbon-positive (petroleum-based) |
Carbon-negative but slower to place |
|
Breathability |
Breathable, manages moisture |
Vapor barrier, can trap moisture |
Breathable |
|
Requires wall framing |
Yes |
Yes |
Yes |
All three approaches require standard wall framing. Biofill™ replaces the insulation layer — not the studs.
Biofill is a professional-install product. It’s poured into standard wall framing, and proper mixing and pour technique directly affects cure strength and R-value, so we recommend working with a certified installer or an experienced hemp-building contractor. If you’re a hands-on homeowner, you can still buy Biofill directly and have your framer or general contractor place it — we’re happy to walk your contractor through the process. Our installer certification program (currently in development) will make it easier to find pros who’ve been trained on Biofill specifically.
Hemp-lime wall assemblies are recognized in the 2024 IRC (Appendix BL) and are being adopted state by state. Approval status and insurer familiarity vary — download our Permit Kit for jurisdiction-ready code references, or contact us and we’ll help you and your local building official work through the review.
Have more questions?
Enter your wall area and thickness - get material volume, price range, install time, and carbon stored in about 30 seconds.
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