Sealing Crawlspace Vents

Closing the Crawlspace Vents

Once our AmeriBrite Encapsulation System has sealed out all the ground moisture, we do not really need vents anymore. Since crawlspace venting is the major cause of condensation, higher heating bills, and mold growth, why would we keep them open. We don’t, in fact, we insulate and seal all outside air leaks from entering the crawlspace including the foundation vents.

There are many different methods to seal the crawlspace vents. The most cost effective method is to insulate the vent cavity with 2″ foam board. The foam board is cut to fit the vent cavity and is sealed around the edges with spray foam to ensure there are no air leaks around the edges of the seal. This method is free of charge with purchase of our AmeriBrite Encapsulation System.

Since a majority of foundation vents are placed in a single block cavity of the foundation, another method is to mortar in a new block. This is usually more work than is necessary, but some homeowners prefer this cosmetic upgrade to the foundation.

We also have plastic vent covers that are specially designed to fit the average vent cavity. These covers are fastened to the outside edges of a vent. They come in several colors and are sealed by weather stripping and caulk.

However you decide in closing your crawlspace vents, keep in mind, that the crawlspace floor MUST be encapsulated with a heavy-duty crawlspace liner. To seal off the vents without addressing the moisture emitting from the ground and foundation is a big mistake.



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