Monolithic & Seamless
Spray or cast-in-place. No thermal bridging. No seams. No sagging. Cures into a single, airtight, breathable wall mass.
Form: continuous monolithic mass
Settling: none once cured
Approved · 2024 IRC Appendix BL
HempShield. The Spray-Applied Hempcrete Revolution.
Approved in the 2024 IRC (Appendix BL). Spray or cast-in-place. Class-A fire rated (ASTM E119). 40% less AC runtime via thermal mass. Net-negative carbon (−0.198 kg CO₂/kg).
Get the Commercial Spec Sheet
2024 IRC APPENDIX BL APPROVED
ASTM E119 FIRE-RATED (2-HOUR)
ASTM E84 CLASS A (FLAME SPREAD <25)
PASSIVE HOUSE COMPATIBLE
LEED v4.1 CREDIT ELIGIBLE
The HempShield Advantage
Four properties nothing else delivers at once.
Massive Thermal Battery
Dense hemp-lime (1,600 J/m³K) creates a 6-to-8-hour thermal lag. Absorbs peak heat and releases it at night—slashes AC runtime by up to 40%.
Heat capacity: 1,600 J/m³K
Lag: 6–8 hours
The Charring Shield
Won't melt or drip toxic cyanide gas like foam. Forms an insulating carbon crust under flame. Passes ASTM E119 with a 2+ hour burn rating.
ASTM E119: 2+ hour rating
ASTM E84: Class A, FS <25
Carbon Sink Material
Third-party LCA verified. Net sequesters −0.198 kg of CO₂ per kg of material. A 2,000 sqft home with 12" walls locks away 1,500+ lbs of CO₂.
Net LCA: −0.198 kg CO₂ / kg
Verification: third-party
Application & Installation
Three Ways to Build with HempShield
Spray-Applied
Pumped directly into stud cavities or against sheathing. Ideal for new construction. Fast, efficient, and seamless.
Cast-in-Place
Hand-tamped or machine-poured into removable formwork. Perfect for solid, structural load-bearing walls without wood framing.
Retrofit & Renovation
Sprayed into existing walls or historic masonry. Add incredible insulation and vapor control without losing the building's character.
Impact Model
Calculate Your Project's Carbon Impact
Enter your wall area and thickness to see the carbon your build puts into permanent storage.
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Your result will appear here.
Planning estimate. Sequestration is modelled from installed wall weight and a net life-cycle factor of −0.198 kg CO₂ per kg of material. Tree equivalence uses the convention of ~48 lbs CO₂ absorbed per mature tree per year. Confirm against the current product EPD before using in a LEED or Passive House submission.
Who We Are
We are concrete contractors, material scientists, and fire safety engineers. We built HempShield because toxic foams and sagging fiberglass are obsolete. Hempcrete is the only insulation that gets harder, stronger, and more carbon-negative over time. We don't sell fluff. We sell verified, lab-tested monolithic wall systems.
Engineer's Sample Kit
Prove It. Order the HempShield Sample Puck.
We'll mail you a cured 4×4 hempcrete sample, a hammer, and a piece of spray foam. Smash both. See the hempcrete hold together. See the foam shatter and off-gas.
- Cured 4×4 hempcrete sample puck
- Matched spray foam sample for side-by-side
- Hammer and impact-test instruction card
- Full commercial spec deck and EPD summary