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Decent carpet will last around 10 years on stairs. Some less durable carpets, like polyester, will only last five years on stairs. The ideal carpet, like wool or nylon, can last about 15 to 25 years. You’ll know when to replace it when it starts wearing down. You may have to replace it sooner if it's stained, whether due to water damage or pets.

A subfloor's lifespan can range from 30 years to the entire life of the house, which is often between 50 and 100 years. The actual longevity depends on the material and its protection from damage. For example, while OSB may last longer than plywood, it is not the best choice for heavy flooring like ceramic tile. The most critical factor is moisture; a subfloor that avoids water damage, mold, and termites can last for decades. However, prolonged exposure to moisture will cause it to warp, rot, or grow mold, significantly shortening its life.

You can tell a carpet is good quality if it’s made of a soft, durable material and has a good face weight and density. When comparing two similar carpets, the higher the face weight, the more durable the carpet tends to be. The same goes for carpet density. A higher density of two similar carpets often indicates better quality. The ideal carpet face weight and density values depend on the carpet material and type. 

The average cost to install an epoxy garage floor is $2,514, with typical projects ranging from $750 to over $5,716. On a per-square-foot basis, you can expect to pay between $3 and $12. Several factors influence the total cost, including the total square footage, required surface preparations, the type and thickness of the epoxy, design complexity, decorative options, and labor costs. For example, an epoxy floor for a one-car garage may cost between $720 and $2,900, while a two-car garage can range from $1,100 to $4,300. Adding decorative elements like flakes can cost about $10 per 250-pound bag, and choosing a metallic epoxy can increase the price to between $5 and $12 per square foot. With proper care and maintenance, a well-installed epoxy floor can last for 10 to 20 years.