How to Replace a Subfloor in a Mobile Home

How to Replace a Subfloor in a Mobile Home

Mobile homes, also known as manufactured homes, provide affordable housing options for many people. However, over time, the subfloor of a mobile home may deteriorate due to moisture, pests, or general wear and tear. If you notice soft spots or sagging floors, it might be time to replace the subfloor. In this article, we will guide you through the process of replacing a subfloor in a mobile home.

Before you begin, it’s important to note that subfloor replacement can be a complex and time-consuming task. If you are not comfortable with DIY projects or lack experience in construction work, it is recommended to hire a professional contractor. However, if you’re up for the challenge, here’s a step-by-step guide:

1. Prepare and gather materials:
– Safety equipment (gloves, goggles, mask)
– Pry bars
– Circular saw
– Hammer
– Nails
– Underlayment
– Subflooring material (plywood or oriented strand board)
– Adhesive
– Screws
– Screwdriver or drill

2. Clear the area:
Remove all furniture, appliances, and floor coverings from the area where you’ll be working. This will provide you with a clean and open space to work in.

3. Inspect and remove the damaged subfloor:
Use a pry bar to carefully remove the floor coverings, such as carpet or linoleum. Inspect the subfloor for any signs of damage or rot. If you find any soft spots or sagging areas, mark them for removal. Using a circular saw, cut along the marked lines to remove the damaged subfloor.

4. Replace the damaged subfloor:
Measure and cut the replacement subfloor material to fit the area you removed. Apply adhesive to the joists, then lay the new subfloor material on top. Secure it in place using nails or screws, making sure to leave a small gap between the panels for expansion. Repeat this process for each damaged area.

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5. Install underlayment:
Lay a layer of underlayment over the new subfloor. This will provide additional support and help prevent moisture from seeping into the floor. Secure the underlayment using nails or screws.

6. Reinstall floor coverings:
Once the underlayment is in place, you can reinstall the floor coverings of your choice. Whether it’s carpet, laminate, or vinyl, follow the manufacturer’s instructions for proper installation.

7. Clean up and inspect:
Clean up any debris or dust left from the construction process. Inspect the new subfloor for any signs of damage or unevenness. If everything looks good, you have successfully replaced the subfloor in your mobile home.


1. How long does it take to replace a subfloor in a mobile home?
The time required to replace a subfloor in a mobile home can vary depending on the size of the area and the extent of the damage. It can take anywhere from a few days to a couple of weeks to complete the project.

2. Can I replace a subfloor myself, or should I hire a professional?
If you have experience in construction work and feel comfortable with DIY projects, you can attempt to replace the subfloor yourself. However, hiring a professional contractor is recommended for those without experience or expertise in this area.

3. How much does it cost to replace a subfloor in a mobile home?
The cost of replacing a subfloor in a mobile home will depend on various factors such as the size of the area, the type of subflooring material, and whether you hire a professional or do it yourself. On average, you can expect to spend around $1,500 to $4,000.

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4. How can I prevent future subfloor damage in my mobile home?
To prevent future subfloor damage, ensure proper ventilation in your home to reduce moisture buildup. Regularly inspect and address any plumbing leaks or water damage promptly. Additionally, consider using moisture-resistant subfloor materials during replacement or renovation projects.

5. Should I remove the entire subfloor or only the damaged sections?
You should only remove the damaged sections of the subfloor unless the entire subfloor is compromised. Removing and replacing the entire subfloor is a much more extensive and costly process.

6. Can I use any type of subflooring material?
It is recommended to use plywood or oriented strand board (OSB) as subflooring materials. They are commonly used in mobile homes and provide durability and strength.

7. How often should I check my mobile home’s subfloor for damage?
It is a good practice to check your mobile home’s subfloor for damage at least once a year. Regular inspections will help you detect any issues early on and prevent further damage.

Replacing a subfloor in a mobile home is a challenging task but can significantly improve the stability and safety of your home. By following the steps outlined in this article and considering the FAQs, you can successfully replace a subfloor and ensure a solid foundation for your mobile home.