- crawl space -

At 340 Fairfax, innovation starts at the crawl space. You may notice there are no
vents in the foundation. That’s because it’s built over a closed crawl space.

The truth is, a crawlspace is just “another room under the house”. It’s also a settling basin for dust, dirt, spiders, crickets, insect parts, reptile skins, rodent droppings and an occasional opossum and leaking sewer pipe. Since hardly anybody sweeps or cleans their crawl space the air inside becomes awfully unhealthy to breathe.


You might say, “Nobody lives in the crawl space. So what’s the big deal?”


Research has proven that lots of the air leaking into the living space comes directly from crawl spaces underneath. So the air in your crawl spaces seeps into the living space where you breathe it. This nasty, contaminated air makes people seriously ill.

Such is not the case at 340 Fairfax.

A state of the art closed crawl space design ensures that Sandee and I will be breathing much healthier air as opposed to air polluted with soil gas, mold spores, bacteria, viruses, chemical termite treatment, and lots of other disgusting substances.

Here’s what it looked like before we started framing.

The inside of our foundation walls were sprayed with polyurethane foam insulation.


Spray foam is a great insulator but also provides a watertight seal that will keep the crawl space dry.

We sealed every crack and hole to make sure this crawl space is substantially airtight. Even the crawl space door is weather-stripped and insulated with foam.

Notice the finished product looks clean enough for Thanksgiving dinner.

We covered the ground with a tough, heavy-duty liner that was sealed around the
edges and at all the piers. It sort of favors a swimming pool liner.

Our crawl space is heated, cooled and dehumidified just like the living space. It is also under negative pressure, which doesn’t allow soil gas, odors or crawl space air to enter our living space.

We also monitor temperature and humidity through our home automation system, which sends out an alert if the humidity climbs above 55%.

By the way, research has also shown that closed crawl space designs reduce
heating and cooling bills about 20%. This makes a closed crawl space pretty
much a no brainer.