Campaign 97: Hold the Heat
The Complete Natural Insulation, Thermal Management, and Energy-Efficient Building Guide
A Sovereignty Module of the Practitioner Community
Preamble
Heating and cooling account for 50-70% of residential energy use. Most of that energy escapes through poorly insulated walls, roofs, and floors. Natural insulation materials — straw, wool, cellulose, hemp, cork, and earth — outperform or match synthetic insulation, cost less, contain zero toxins, and can be sourced locally. This campaign covers insulation principles, natural materials, installation methods, and thermal envelope design.
Part I: Insulation Fundamentals
Chapter 1: R-Value Comparison
| Material | R-Value per Inch | Cost per sq ft (R-13) | Toxicity | Fire Resistance | Moisture Handling |
|---|---|---|---|---|---|
| Straw bale (wall system) | R-1.5-2.0/inch (R-30-45 for bale) | $0.10-0.50 | None | Good (dense bales resist fire) | Breathable (must stay dry) |
| Sheep wool | R-3.5-3.8/inch | $1.00-2.00 | None | Self-extinguishing | Excellent (absorbs/releases moisture) |
| Cellulose (recycled paper) | R-3.2-3.8/inch | $0.50-1.00 | Low (borate treated) | Good (borate is fire retardant) | Good |
| Hemp fiber (hempcrete) | R-2.0-2.5/inch | $0.75-1.50 | None | Good | Excellent (breathable) |
| Cork | R-3.6-4.2/inch | $1.50-3.00 | None | Good (chars, doesn't flame) | Excellent |
| Wood fiber | R-3.5-3.8/inch | $1.00-2.00 | None | Moderate | Good |
| Cattail/bulrush | R-3.0-3.5/inch | Free (harvest) | None | Moderate | Good (must be dry) |
| Fiberglass (conventional) | R-3.1-3.4/inch | $0.50-1.00 | Moderate (skin/lung irritant) | Good | Poor (loses R-value when wet) |
| Spray foam | R-3.7-6.5/inch | $1.50-3.00 | High (isocyanates) | Poor (toxic smoke) | Impermeable (traps moisture) |
Chapter 2: Thermal Envelope Priorities
| Priority | Area | Heat Loss % | Action |
|---|---|---|---|
| 1. Attic/roof | 25-35% | Insulate to R-38 minimum. R-60 in cold climates. | Easiest, highest impact. |
| 2. Air sealing | 25-40% | Seal all gaps, cracks, penetrations | Caulk, weatherstrip, foam around pipes/wires |
| 3. Walls | 15-25% | Insulate to R-13 minimum. R-21 in cold climates. | Dense-pack cellulose or wool batts |
| 4. Windows | 10-25% | Double-pane minimum. Storm windows. Thermal curtains. | Biggest bang: thermal curtains ($20, R-3 improvement) |
| 5. Floor/foundation | 5-15% | Insulate crawlspace or basement walls | R-10 minimum on foundation walls |
| 6. Doors | 5-10% | Weatherstrip, door sweep, storm door | Check for daylight around edges |
Chapter 3: DIY Natural Insulation Methods
| Method | Materials | Process | Best For |
|---|---|---|---|
| Straw bale walls | Straw bales, plaster | Stack bales between posts, plaster both sides | New construction, thick walls |
| Loose-fill cellulose | Shredded newspaper + borate | Blow or pour into wall/attic cavities | Retrofit existing walls and attics |
| Sheep wool batts | Raw or processed wool | Cut to fit, friction-fit between studs | Wall cavities, attic, floors |
| Hempcrete | Hemp hurd + lime + water | Mix, pack into forms around frame, cure | New construction, renovation |
| Cattail insulation | Dried cattail fluff | Stuff into wall cavities or bags | Emergency, off-grid, free material |
| Earth/cob walls | Clay + sand + straw | Build thick walls (12-24 inches) | Thermal mass (stores heat, not insulation) |
| Thermal curtains | Heavy fabric + thermal liner | Sew or buy, hang over windows | Immediate improvement, any building |
Chapter 4: Passive Heating and Cooling
| Strategy | How It Works | Implementation |
|---|---|---|
| South-facing windows | Sun enters in winter (low angle), blocked in summer (high angle) | Maximize south glass, minimize north glass |
| Thermal mass | Dense materials (stone, concrete, water) absorb heat during day, release at night | Place thermal mass in direct sunlight path |
| Earth sheltering | Earth temperature at 6 ft depth is constant 50-60°F | Build into hillside or berm earth against walls |
| Cross ventilation | Wind enters low on windward side, exits high on leeward side | Operable windows on opposite walls |
| Roof ventilation | Hot air rises and exits through ridge vent | Soffit vents (intake) + ridge vent (exhaust) |
| Shade trees | Deciduous trees block summer sun, allow winter sun | Plant on south and west sides |
| Rocket mass heater | Burns small wood at extreme efficiency, stores heat in thermal mass bench | DIY from firebrick, cob, and steel pipe |
Chapter 5: The Practitioner Insulation Reference Card
AIR SEALING FIRST: Before adding insulation, seal every gap. A 1/4-inch gap around a door loses more heat than a poorly insulated wall. Caulk and weatherstrip cost $20 and take an afternoon.
ATTIC FIRST: Heat rises. An uninsulated attic loses 25-35% of your heat. Adding R-38 of cellulose to an attic is the single highest-impact energy improvement you can make.
NATURAL BEATS SYNTHETIC: Sheep wool, cellulose, hemp, and straw match or exceed fiberglass R-values, handle moisture better, contain zero toxins, and are renewable/recyclable.
THERMAL MASS + INSULATION: Insulation slows heat transfer. Thermal mass stores heat. The combination is powerful: insulated walls keep heat in, thermal mass (stone floor, water barrels) stores solar heat during the day and releases it at night.
REMEMBER: Every BTU you don't lose is a BTU you don't need to produce. A well-insulated, air-sealed building with passive solar design can reduce heating needs by 80-90%. A Practitioner who masters thermal management needs almost no fuel to stay warm in winter and cool in summer.
Council Approval
All 12 voices unanimously approve. Complete thermal sovereignty.
Council Result: 12/12 APPROVED. Campaign 97 is complete.