5 Best Insulation Under Mobile Home Options Explored

Insulating a mobile home’s underbelly is crucial for comfort and energy efficiency. Choose from options like fiberglass, spray foam, rock wool, cellulose, or fiberglass blankets based on needs and budget.

Basement or crawl space with upper floor insulation and wooden support beams. An area of limited height under the floor of a house with concrete wall and floor.

Insulating the underbelly of your mobile home is a critical aspect of maintaining its structure and comfort level. While there are numerous types of insulation available on the market, not all are suitable for mobile home underbellies.

Proper insulation is crucial for any home, but it is especially vital for mobile homes.

Mobile homes often have less substantial construction compared to traditional homes, making them more susceptible to temperature fluctuations.

A well-insulated mobile home ensures that the home stays warm in the winter and cool in the summer, leading to reduced energy costs.

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There are several types of insulation materials available, each with its own set of advantages and disadvantages. Fiberglass and cellulose are quick and cheap options but are highly susceptible to absorbing moisture.

Conversely, spray foam insulation may be a better option for mobile home underbellies due to its water-resistant properties.

Let’s explore these choices in more detail.

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Fiberglass Insulation

Stack of fiberglass insulation material. Mineral wool insulator for heat and cold protection.

If you choose to use fiberglass insulation, it should be blown with an insulation-blowing machine for optimal coverage.

However, caution must be taken to ensure it doesn’t come into contact with moisture-prone areas.

Moreover, fiberglass insulation is lightweight, so it won’t corrode the metal roof from underneath if used properly.

The Pros and Cons

Fiberglass insulation is widely used due to its affordability and effectiveness.

It provides excellent thermal resistance, helping to maintain a comfortable temperature within the home.

However, one major downside is its susceptibility to moisture. Absorbed moisture can lead to mold, mildew, and rot.

Therefore, while fiberglass can be a good option for insulating the walls or attic of your mobile home, it may not be the best choice for the underbelly where exposure to ground moisture is higher.

Spray Foam Insulation

Technician dressed in a protective white uniform spraying foam insulation using Plural Component Spray Gun. Spraying polyurethane foam for roof and energy saving

Given its water-resistant properties and ability to fill gaps, spray foam insulation might be the perfect fit for the underbelly of your mobile home.

It is able to withstand the harsh conditions often associated with this area of the home, providing long-term benefits despite its higher upfront cost.

The Pros and Cons

Spray foam insulation has increasingly become a popular choice, particularly for mobile home underbellies. The material expands upon application, filling gaps and providing a tight seal against air leaks and moisture.

Furthermore, it offers superior insulating properties compared to most other materials. However, spray foam insulation is generally more expensive than other options and requires professional installation.

Rock Wool Insulation

Package of thermal insulation material, rock wool is wrapped in foil.

When installing rock wool insulation, it’s essential to wear protective gear due to the tiny fibers that can be released into the air.

These fibers can cause irritation if inhaled or if they come into contact with the skin. Therefore, it may be preferable to hire a professional for installation.

The Pros and Cons

Rock wool insulation is known for its fire-resistance and soundproofing capabilities. It also resists mold and mildew, making it a good option for damp environments.

However, it is typically more expensive than fiberglass and cellulose insulation, and it can be more difficult to install due to its density.

Cellulose Insulation

Close shot of eco friendly cellulose insulation filling held in hand

Although cellulose insulation has many benefits, its weight and vulnerability to moisture make it a less ideal choice for mobile home underbellies.

It is better suited for areas that are less prone to moisture and can support heavier materials.

The Pros and cons

Cellulose insulation is an environmentally friendly option made from recycled paper. It has a lower cost than many other types of insulation and can provide good thermal performance.

However, like fiberglass, it is also susceptible to moisture and can be heavy, which could potentially damage the underbelly of your mobile home.

Fiberglass Blankets

When using fiberglass blankets, it’s important to ensure that they are installed correctly to prevent gaps and compression.

They should be secured tightly to prevent sagging and should not be used in areas prone to moisture.

The Pros and Cons

Fiberglass blankets are another form of insulation that can be used in mobile homes. They are easy to install and can cover large areas effectively.

However, like loose-fill fiberglass, they are also susceptible to moisture and can compress over time, reducing their insulating effectiveness.

FAQs about Insulation

How do you insulate the underbelly of a mobile home?

To insulate the underbelly of a mobile home, start by choosing the appropriate insulation material.

For example, spray foam might be an ideal choice due to its moisture resistance.

The insulation should then be attached directly to the polyethylene underbelly material, taking care to cut around pipes and ductwork.

What do you use to insulate under a mobile home?

When insulating under a mobile home, use a material that is resistant to moisture and pests. This might be spray foam, rock wool, or even a specially designed belly wrap or bottom board.

What is the best way to insulate under a trailer?

The best way to insulate under a trailer is to use a moisture-resistant insulation material, such as spray foam, and to ensure that it is properly installed to provide a tight seal.

Patch any existing holes or tears in the underbelly material before installing the new insulation.

What is the underbelly of a mobile home?

The underbelly of a mobile home is the bottom side that protects the insulation and prevents moisture and pests from entering the home.

It is also referred to as a bottom board, barrier, sheeting, belly paper, or closure paper, among other regional names.

Insulating your mobile home’s underbelly is an important task that can significantly impact your home’s comfort, energy efficiency, and longevity.

Whether you choose fiberglass, spray foam, rock wool, cellulose, or fiberglass blankets for this task, it’s crucial to select a material that fits your specific needs and budget.

With the right choice and proper installation, you can ensure a well-insulated mobile home that stands up to the elements.

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