Air seal your crawlspace with low-VOC sealant – HHWG

Air seal your crawlspace with low-VOC sealant

air sealing 2

  • Why is this important?

  • Your home is constantly breathing. When windows and doors are closed, the air it breathes comes from the crawlspace and attic, carrying whatever pollutants are there. We want to control how air is exchanged in a home. By sealing your crawlspace and attic we prevent pollution from outside and from these dirty areas from coming into our living room. It is a critical first step for your home to breathe clean air. However, air sealing and a ventilation system should go hand-in-hand. Sealing will prevent pollution from coming in and going out. By coupling air sealing with a ventilator you will keep out pollution while bringing in filtered air into your living space. This effectively controls what your home – and you – breathe.

  • What should I do?

  • You can hire someone to air seal or do it yourself. Do what you can to work around the insulation without compressing it. The key areas to focus on are the top plate, or top of your walls where the roof meets your home, and significant leakage areas such as plumbing. Retail air sealing products contain a high amount of VOCs. The product below emits the lowest VOCs we’ve found for DIY. If using a contractor, request Knauff Ecoseal or Owens-Corning Energy Pak foam sealant which are not available via retail stores. Both are Greenguard Gold certified and have the lowest VOCs available.

    Air sealing is more effectively done when no insulation is present, so depending on the state of your insulation you may receive a quote for both from a contractor.


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