insulation installation mobile homes underbelly

How to Install or Replace Insulation Under Your Mobile Home

Often under-home insulation is overlooked, with many banking solely on ceiling and wall insulation for energy efficiency. Overlooking the subfloor, however, can inflate energy bills as it necessitates higher heating to keep comfortable.


Since the underbelly of a mobile home is exposed to elements, it needs insulation material that reduces heat loss. While manufactured homes typically come with insulation, their insulation may need replacement after 15-20 years to ensure their energy efficiency.


Delivered manufactured homes feature fabric barriers protecting the underbelly during transit. These are temporarily removed for insulation, then reinstalled after the process.


If the fabric road barriers are damaged, you need to replace them to protect the newly installed insulation from critters, moisture, and other elements.


Here is a step-by-step guide on installing or replacing insulation under a mobile home 

Step 1: “Laying a Moisture Barrier Beneath Your Mobile Home”

Before you begin your project, lay a moisture barrier on the ground beneath your mobile home. Choose high-quality polyethylene plastic sheeting to prevent water from infiltrating the insulation material. Additionally, adding this barrier makes it more comfortable to crawl than on dirt ground.


Step 2: “Removing Staples, Nails, and Screws to Detach the Road Barrier”

Remove staples using a flat-head screwdriver, nails with a pry bar, and screws with a Philips screwdriver to take off the road barrier beneath the mobile home. Next, leave one side of the barrier attached to the rim joist of the belly board.


Step 3: “Insulating Pipes in the Underbelly to Prevent Freezing”

If you’re living in a region that experiences a bitterly cold winter, it’s a sacrosanct rule to cover all the pipes in the underbelly with insulating materials to prevent them from freezing and bursting.

Fortunately, this is an easy DIY project that uses foam pipe insulation, which you can easily find in your local hardware or home improvement store.


Step 4: “Inspecting and Sealing the Floor and Joist”

Inspect the floor and joist, paying close attention to the seams and gaps where pipes and wires pass through the floor. Next, seal any cracks and crevices using caulk.


Step 5: “Removing Old Insulation and Installing New Fiberglass Batt Insulation”

If there’s old and damaged insulation, you need to remove it before filling the cavities between joists with a new paper-backed fiberglass batt insulation. Make sure that you face the paper side toward the ground. Next, attach the paper to the joists using a staple gun.


Step 6: “Applying Polyurethane Foam Insulation in Hard-to-Reach Spaces”

When dealing with small and difficult-to-reach spaces, use polyurethane foam insulation. The idea is to eliminate all air pockets where heat can escape from the living quarters, and the cold draft can creep into your mobile home.


Step 7: “Securing the Fabric Road Barriers Post-Insulation”

Once you have insulated all the cavities, reattach the fabric road barriers with the fasteners that come with them. Make sure that the barrier is properly secured to prevent it from sagging.



In conclusion, ensuring proper insulation under your mobile home is essential for maintaining energy efficiency and a comfortable living environment.

By following the step-by-step guide provided in this article, you can successfully install or replace insulation in your mobile home’s underbelly, thereby lowering your energy bills and preventing issues like frozen pipes during harsh winters.

Don’t overlook the importance of thorough insulation – invest in your mobile home’s long-term comfort and energy efficiency by addressing this often-neglected area.


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  2. Living in a Mobile Home in California: Pros and Cons
  3. Are Manufactured Homes Safe and Durable?
  4. Senior Mobile Home Park: What Are They?

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