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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.

No subflooring is perfectly level, but you should never ignore any noticeable floor sagging. Most contractors deem a floor that slopes by a 1/2 inch to 1 inch per 20 feet of floor acceptable. Further investigation is required when the slope or sag is more than one and a half inches.

Whether you install flooring before or after kitchen cabinets depends primarily on the type of flooring you are using. For materials like hardwood, tile, and sheet flooring, the best practice is to install the flooring first. This ensures the cabinets are installed at the correct height and on a stable surface. However, you should not install cabinets on top of floating floors, such as laminate or luxury vinyl plank (LVP). These types of flooring need room to expand and contract with temperature and humidity changes. Placing heavy cabinets on top can restrict this movement, potentially causing the floor to buckle and making the cabinets unstable. For floating floors, install the cabinets first and then lay the flooring up to them. Other reasons to consider installing cabinets before the flooring include saving money on materials (since you won't need flooring under the cabinets) and avoiding potential damage to your new floor during cabinet installation. Additionally, installing cabinets directly on the subfloor might prevent voiding your flooring's warranty.

While carpet over carpet may provide some additional insulation and soundproofing benefits, it's not as effective as other methods. Layering carpets can add a modest buffer against noise and temperature fluctuations, but it's limited compared to installing thicker carpet padding or using specialized soundproofing materials. For optimal floor insulation and soundproofing, consider alternative solutions tailored to your specific needs and budget, such as adding additional padding or soundproofing underlayments beneath the carpet.