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Straw bale building

Also known as: Straw-bale construction

A natural-building method using bales of agricultural straw (typically wheat, rice, or rye) as wall infill, plastered inside and out with earth, lime, or cement. Originated on the Nebraska Sandhills in the late 1800s when settlers used the only available material; revived in the 1980s-90s as part of the natural-building movement. Excellent insulation values (R-30 to R-50+ for thick walls), uses an agricultural waste stream, sequesters carbon in the bales, and produces breathable buildings with thick deep windowsills. Widely permitted today; thousands of straw-bale homes exist in the U.S. Southwest, Pacific Northwest, and elsewhere.

Method

Walls are built from rectangular straw bales — typically 18”x14”x36” “two-string” or 23”x16”x46” “three-string” bales weighing 50-90 lbs. Bales are stacked like masonry, pinned with rebar or bamboo, and plastered with multiple coats of earth, lime, or cement plaster.

Two main approaches:

  • Load-bearing (Nebraska-style) — bales themselves carry roof load; structural posts not required
  • [[timber-framing|Post-and-beam]] — wood frame carries load, bales are infill insulation

Properties

  • Insulation — R-30 to R-50+ depending on wall thickness; superior to most conventional walls
  • Carbon — straw is agricultural-residue carbon; sequestered in the wall for the building’s lifetime
  • Breathable — earth and lime plasters allow walls to manage moisture without mechanical ventilation
  • Fire resistance — plastered straw bales pass standard fire-rating tests
  • Cost — low material cost; high labor cost (especially plastering)
  • Permitting — most jurisdictions permit straw-bale; specific code provisions in some states

Who builds with straw

  • The Nebraska tradition (Sandhills, late 1800s) — original; some 100+ year buildings still standing
  • The Canelo Project ([[sedona|Arizona]]) — Athena and Bill Steen; pioneers of the modern revival
  • The Last Straw journal and natural-building network
  • Builders Without Borders, Builders Cooperative, and other distributed networks

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

  • Shares approach with: [[hempcrete]] · [[cob]]
  • Member of: [[practice]]

Sources

  • The Straw Bale House, Athena and Bill Steen et al. (Chelsea Green, 1994)
  • Build It With Bales, Matts Myhrman and S.O. MacDonald (1997)
  • The Last Straw journal

Rooted in life.

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Practical

shares approach with

  • Cob building cob and straw-bale are complementary natural-building methods; often combined (cob walls with straw-bale north walls for insulation)
  • Natural plaster straw-bale walls are plastered (typically with earth or lime); the plaster is structurally and aesthetically critical to the building

2 inbound links · 3 outbound