By creating a continuous hermetic airtight layer, enclosing the complete envelope of the house, enclosed by the roof, external walls, windows and ground floor. This should be addressed by treating the house like a ‘balloon’ with no leaks or punctures for air to escape out. Warm, vapour-laden air, that’s generated in the inside of the house, under a driving pressure to the outside, should be prevented from seeping out, by providing a continuous membrane or air tight surface, preventing it from convecting and diffusing through the interior, warm side of the insulation, or through multiple small gaps that may occur at joints and junctions.