The Path to Drawdown: Insulation
Buildings and construction account for about 38% of the total global CO2 emissions and 35% of total energy use. Much of this energy is used to heat and cool a home, but a sizable amount of it (25-60% of that energy) is wasted through air infiltration, or heat escaping from warmer areas to cooler areas.
Better insulation of building envelopes can reduce escaping heat. Insulation is the use of high levels of improved materials in buildings that resist heat flow and regulate indoor temperatures. Ideally, insulation should cover all sides of a building, from the bottom floor, exterior walls, to the roof. Insulation should also be continuous - sealing gaps and cracks is critical to a more thermal resistant building envelope.
Insulation is one of the cheapest and most practical solutions to make buildings more energy efficient, both in new construction and through retrofitting older buildings that are often not well insulated. This also means lower utility bills, keeping out moisture, improving air quality and avoiding GHG emissions associated with energy use.
Project Drawdown estimates that, in 2018, 30% of buildings worldwide were insulated. If existing residential and commercial buildings in temperate and tropical countries install insulation (with low carbon materials) at a rate of 1.6 - 2% every year, between 17 - 19 gigatons of GHG emissions can be avoided by 2050.