Alpha Insulation offer a range of services and advice on how to build an Airtight home. We can provide a range of spray foams and liquid airtight membranes to target the areas which are prone to air leaks and to make your new build property more efficient. Call us for more advice and services
Build tight, ventilate right!! Energy-efficiency experts have been advising this for over a decade. Building Regulations are constantly pushing towards building a home that is airtight. This is a new concept to building. To achieve the legal requirement a house should test less than 10m³/(hr/m²) at 50 pascals. This is the very basic standard. Aim to achieve 1.0m³/(hr/m²) or less. Why try? It is now a legal requirement but even more importantly it makes a major improvement to the energy performance of the building.
Air tightness is essential to prevent heat loss via the fabric of the building and maximizing the effectiveness of thermal insulation thus reducing energy consumption.
For example, an 80m² house which is not airtight requires the same energy to heat as a 400m² house which has a very high standard of air tightness.
Air tightness must be incorporated into the building at design stage.
To many, the concept of ‘airtightness’ seems somehow alien and unwelcome. ‘I don’t want to live in a plastic bag’ being a typical response. Or ‘I always sleep with the windows open, so what’s the point?’ They fear that an airtight house will be an unhealthy one, full of stale smells and condensation. Indeed, the classic Victorian house was designed to be as air-leaky as possible in order to expel the coal smoke: with rattling sash windows, draughts through the floorboards and open fireplaces. This, we thought, was healthy. But perceptions are changing, people are cottoning on to just how important air tightness is in low-energy houses.