Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?

Airtightness

Stops CONVECTION: air physically leaving the building through gaps and taking its heat with it. The test: it does nothing in a house with no holes, because it has nothing left to close. Measured in air changes per hour and never in R-value, since sealing a gap adds no insulation whatsoever. Always paired with a deliberate means of ventilation, or the house gets damp.

Solutions

• Airtight membrane with taped/sealed joints: A continuous membrane on the warm side of the insulation, with every joint and opening taped shut. It stops warm indoor air leaking out through gaps, which is w
• Draught-proofing an existing house: Sealing the gaps that let air into an existing house: around windows and doors, along the foot of the walls, around pipes and cables, at the loft hatch and in u