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How to Replace RV Subfloor

If you own an RV and have noticed issues with your subfloor, it’s crucial to address them promptly.

The subfloor forms the foundation of your RV’s interior, providing stability and support.

Over time, due to wear and tear or water damage, the subfloor may require replacement.

In this comprehensive guide, we will walk you through the process of replacing your RV subfloor.

From understanding the signs of subfloor damage to step-by-step instructions, we’ve got you covered.

Let’s dive in!

How to Replace RV Subfloor: Step-by-Step Guide

Assessing Subfloor Damage

Before diving into the replacement process, it’s essential to assess the extent of the subfloor damage.

Look out for the following signs:

  • Soft or spongy areas
  • Water stains or discoloration
  • Unpleasant odors
  • Sagging or uneven flooring
  • Visible signs of rot or decay

Identifying the damage will help you determine the scope of the repair and plan accordingly.

Gathering the Necessary Tools and Materials

To successfully replace your RV subfloor, gather the following tools and materials:

  • Safety goggles and gloves
  • Pry bar or crowbar
  • Circular saw
  • Drill and screws
  • Measuring tape
  • Replacement subfloor material (marine-grade plywood is recommended)
  • Adhesive or construction adhesive
  • Level
  • Hammer

Removing the Damaged Subfloor

Start by removing any fixtures or furniture above the damaged subfloor.

Once cleared, carefully remove the flooring material, taking care not to damage the surrounding areas.

Use a pry bar or crowbar to lift the damaged subfloor.

Take your time to ensure a clean removal.

Cutting and Fitting the Replacement Subfloor

Using your measuring tape and circular saw, cut the replacement subfloor to match the dimensions of the removed section.

Make precise cuts to ensure a snug fit.

Test the fit by placing the replacement subfloor in the designated area.

Make any necessary adjustments before moving forward.

Securing the Replacement Subfloor

Apply construction adhesive to the exposed beams or framework where the replacement subfloor will be installed.

Carefully position the replacement subfloor and secure it with screws, ensuring it sits level and flush with the surrounding flooring.

Use a level to double-check the alignment.

Reinstalling Flooring and Fixtures

With the replacement subfloor in place, it’s time to reinstall the flooring material and fixtures.

Depending on your RV’s interior, this may involve laying carpet, installing vinyl or laminate flooring, or reattaching any removed fixtures.

Follow the manufacturer’s instructions for the specific materials used.

Finishing Touches and Inspections

Once the flooring and fixtures are reinstalled, take a moment to inspect the entire area.

Ensure everything is properly secured, level, and aligned.

Make any necessary adjustments or repairs.

Additionally, conduct a thorough cleaning to remove any debris or dust generated during the replacement process.


How do I know if my RV subfloor needs replacement?

If you notice soft spots, water damage, sagging floors, or signs of rot in your RV, it’s likely that the subfloor needs replacement. Additionally, unpleasant odors or visible discoloration are indicators of subfloor issues.

Can I replace my RV subfloor myself?

Yes, it is possible to replace your RV subfloor yourself. However, keep in mind that this is a complex task that requires careful planning and execution. If you’re not confident in your DIY skills, it’s advisable to seek professional assistance.

What type of subfloor material is best for RVs?

For RV subfloor replacement, marine-grade plywood is highly recommended. It offers durability and resistance to moisture, making it ideal for the demanding conditions of RV travel.

How long does it take to replace an RV subfloor?

The time required to replace an RV subfloor depends on various factors, such as the extent of damage, the size of the affected area, and your experience level. On average, the process can take several days to complete.

Are there any preventive measures to avoid subfloor damage in an RV?

Yes, there are preventive measures you can take to minimize subfloor damage in your RV. Regularly inspect your RV for signs of water leaks, address any issues promptly, and ensure proper ventilation to prevent moisture buildup.

Can I use alternative materials for RV subfloor replacement?

While marine-grade plywood is the recommended material for RV subfloor replacement, some alternatives include oriented strand board (OSB) or composite boards. However, it’s important to consider the specific requirements and potential drawbacks of each alternative.


Replacing your RV subfloor is a crucial maintenance task that ensures the integrity and safety of your vehicle.

By following the step-by-step guide provided in this article, you’ll be well-equipped to tackle this project successfully.

Remember to assess the damage, gather the necessary tools and materials, and proceed with caution.

If in doubt, consult a professional for assistance.

With a solid subfloor in place, you can continue enjoying your RV adventures with peace of mind.