The complexity of installation depends on the type of flooring you choose and the level of expertise required to install it. While some materials, like vinyl or laminate, offer relatively straightforward installation processes suitable for DIY enthusiasts, others, such as natural stone or hardwood, often require professional assistance from a flooring company to ensure proper fitting and longevity.

The difference between a 40-oz. and 60-oz. carpet is the carpet face weight, meaning the 60-oz. carpet weighs 20 ounces more per square yard. When looking at two similar carpets of the same material and type, the 60-oz. carpet face weight likely indicates higher quality and more durability due to heavier carpet fibers. 

While it's possible to cover asbestos tile with carpet, it's not recommended. Encapsulating tile beneath carpet doesn't eliminate the health risks. Over time, the asbestos tiles could degrade, releasing fibers into the air and potentially contaminating the carpet. Disturbance during carpet installation or removal might also release fibers.

Installing carpet over carpet may affect the warranty of the new carpet. Check with the manufacturer or retailer regarding their warranty policies. Many warranties stipulate specific installation guidelines, and installing carpet over carpet may not comply with these requirements. Voiding the warranty due to improper installation methods can leave you without help in case of issues or defects with the new carpet.