Should my new house “breathe?”

Ask any seasoned carpenter (that does not understand building science) and they are likely to tell you “don’t build too tight, you want your house to breathe.” This is a tried and true “because that is the way we always do it idea.”



Early in the construction industry you did not build a home air-tight so that the walls could dry out. This is a leftover from days before we insulated or conditioned a home and wanted to air them out to keep them healthy inside.


However, now we have added insulation into our walls to increase energy performance.

Now we have heating, cooling, and ventilation systems to control indoor-air-quality and make the house comfortable and healthy.


So if your builder tells you they have done anything less than make your home as air tight as an igloo cooler, ask them if they will help pay your monthly electric bills. Ask them if they will come and dust your home once a week. Ask them why they continue to build as if the house is not insulated or conditioned.


Making your home air tight is key to a healthy, energy-efficient, and durable solution. Of course you do need a heating and cooling system that includes ventilation. This is how you bring fresh air into the house – through a filter – using an energy recovery ventilator. Making your home air tight filters the air reducing the need to dust. It also reduces energy consumption. It also filters the air improving indoor air quality. Making it air tight includes sealing every connection, joint, vent, penetration, window, door, roof, and hole.


Triple C Camp - NEST Rebuild, 2010

3 Comments Add yours

  1. W. Blake Talbott says:

    Every effort should be made to seal a home air tight but they are going to leak if they have doors, windows and exhaust fans. Windows are allowed by industry minimums to leak some per NFRC acceptable minimum. Operable windows leak as their seals age, sliding windows more so.

    Available door weatherstripping rarely remains air tight for more than a year. And every time they are opened they introduce fresh air which a central HVAC will introduce to the whole house.

    IAQ recommendations are still being debated by experts and controversial.

    Only homes complying with .15 psi per 75 paschal and few occupants with no kids should be concerned about a separate introduction of fresh air.

    Liked by 1 person

  2. You cannot count on leaks in the home envelope for a healthy house. Look at the standards for the American Lung House – I have experienced the space. Spending 15 minutes inside I feel a higher level of energy and breath easier than any other house I have been in. I know from personal experience that you need fresh air. On the science side, if the house is sealed tight – to our specs – you should have a fresh air system to bring air into the house. ASHRAE 62.2 has a standard that you can follow. Mechanical ventilation is recommended when your home reaches .35 ACH or lower. The homes we have designed that have been tested are usually .1 -.2. We have had one test below .1 and it has doors, windows, and vents.


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