Hemp construction is now recognized in the 2024 IRC. Get carbon-negative, mold-resistant, Class A fire-rated batts delivered to your site today.
Claim Your Free Fire Test KitFree sample batt · Engineering specs · Ships in 24 hours
Fire behavior, carbon, and moisture — the three places conventional insulation quietly costs you.
Chars, it doesn't melt or drip. No toxic smoke from halogenated retardants. Class A flame-spread under ASTM E84 — the top rating a building material can carry.
ASTM E84: Class A (flame spread ≤ 25) · Assembly fire ratings are tested per ASTM E119 at the wall level — ask us for the listed assembly that matches your section.
Locks away roughly 1.6 kg of CO₂ per kg of hemp fiber. Every HempShield batt turns your wall assembly into a negative-emission carbon vault.
Cradle-to-gate: net negative. Carbon is fixed photosynthetically during growth and stays bound in the installed fiber for the life of the building.
Breathes naturally. Wicks moisture away from studs, prevents rot and mold without harmful chemical additives.
Hygroscopic: buffers vapor and releases it as conditions change — assemblies dry in both directions instead of trapping water behind a membrane.
Friction-fit batts for standard framing. Cuts with a bread knife, hangs without staples, needs no respirator.
Enter your square footage and framing depth to see the carbon your install puts into permanent storage.
Your result will appear here.
Estimate for planning only. Sequestration figures are based on typical hemp fiber carbon content and installed density; tree equivalence uses the EPA convention of ~48 lbs CO₂ absorbed per mature tree per year. Confirm against product EPDs before using in a LEED or Passive House submission.
We are builders, firefighters, and environmental scientists who got sick of itchy fiberglass and toxic off-gassing foams. With the historic recognition of hemp construction in US building codes, we created HempShield to bring the world's most scientifically superior insulation to American homes. No greenwashing. Just brute-force protection.
Long-form guides on hemp insulation, hempcrete construction, and the building codes that now govern both.
Spray-applied and cast-in-place hempcrete — the monolithic alternative to spray foam. No thermal bridging, no seams, no off-gassing.
Read the article → Complete GuideCost, R-value, fire rating, mold resistance, installation, and honest comparisons to every alternative on the market.
Read the article → Building CodesHow hemp-lime went from federally illegal to 2024 IRC Appendix BL — and which states and cities have adopted it so far.
Read the article →Includes a 4×4 sample batt, fire-test challenge card, and full engineering specs.
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