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In nearly all cases, you are required to install a vapor barrier in your crawl space. However, local regulations will change based on the local climate and the crawl space's susceptibility to moisture. Even if a vapor barrier is not legally required, it is often a good idea to keep your crawl space dry.

When considering finishing your basement, take into account a few pros and cons:

Pros

• Can increase the value of your home

• Separate space from the rest of the house 

• Customize and personalize the basement to suit your needs and style

• Increase the amount of living space in your home

Cons

• May not regain enough value to cover the cost of finishing

• Lack of natural light if it’s below ground level

• Moisture or flooding can cause costly damage

• Installing plumbing and electrical can be messy and costly

External pressure on the basement wall can cause it to bow inward. Soil, heavy with water saturation, is commonly the main culprit. The soil exerts immense pressure on the wall, causing it to fail, at least partially. This is known as hydrostatic pressure—these situations can occur after rainfall or simply due to regular groundwater presence and may be temporary or more permanent.  

A sewage smell in your crawl space is usually from a damaged or clogged pipe leaking sewer gasses or actual sewage underneath your home, but there are some other common causes. Moisture, from poor or damaged encapsulation or a malfunctioning sump pump, can harbor mold and bacteria, causing a musty smell. Pests can also get stuck in your crawl space and die, which causes a sewage-like odor.