Does insulating a mobile home or manufactured home in New Brunswick differ from insulating a stick-built house?

Yes, insulating a mobile home in New Brunswick requires significantly different approaches than stick-built homes due to unique construction methods, thinner wall cavities, metal framing, and elevated foundation systems that create specific challenges in our cold Maritime climate.

Mobile homes built before 1990 typically have minimal insulation — often just R-7 to R-11 in walls and R-14 to R-19 in ceilings — making them expensive to heat during NB's long winters. The combination of thin construction, metal thermal bridges, and elevated floors creates comfort and energy problems that require targeted solutions.

Wall Insulation Challenges

Mobile home walls are typically only 2x3 or 2x4 construction with metal studs or wood studs on 24-inch centers, giving you very limited cavity space. The metal siding acts as a thermal bridge, conducting cold directly through to the interior. Dense-pack cellulose retrofit is often the most practical wall upgrade — contractors drill small holes through the interior paneling and blow cellulose into the wall cavities at 3.5+ pounds per cubic foot density. This provides both insulation (bringing walls up to R-12 to R-14) and significant air sealing.

Exterior continuous insulation is another option but requires careful planning. Adding 2 inches of rigid foam (XPS or mineral wool) over the existing siding, then installing new siding, can achieve R-20+ whole-wall performance. However, this affects window and door trim details and may require building permit approval depending on your municipality.

Floor Insulation — Critical in NB

The elevated floor system is where mobile homes lose the most heat in New Brunswick's climate. Most mobile homes have minimal floor insulation that has often sagged, compressed, or been damaged by moisture over decades. The floor assembly is essentially a bridge deck exposed to winter wind underneath — without proper insulation and skirting, you're heating the outdoors.

Spray foam is the gold standard for mobile home floor insulation. Closed-cell spray foam applied to the underside of the floor deck provides R-12 to R-14 (2 inches), acts as both insulation and vapour barrier, and adheres permanently without sagging. Expect to pay $3,000 to $6,000 for a typical single-wide or $5,000 to $10,000 for a double-wide, but the comfort improvement is dramatic — many homeowners report the floors feeling warm for the first time.

If spray foam is outside your budget, properly installed fibreglass batts with a continuous vapour barrier can work, but require careful installation. The batts must be held in place with wire mesh or strapping, and the entire assembly needs a 6-mil polyethylene vapour barrier on the warm (upper) side. Any gaps or compression dramatically reduces effectiveness.

Skirting and Wind Barriers

Proper skirting is essential — it's not just cosmetic. The space under a mobile home acts like a giant wind tunnel in NB's coastal and valley winds. Insulated skirting or a full foundation wall eliminates wind washing through floor insulation and creates a buffer zone that stays warmer than outdoor air. Vinyl skirting with foam board backing, concrete block with rigid foam, or even properly vented crawl space encapsulation all work better than standard ventilated skirting.

Ceiling and Roof Considerations

Mobile home ceilings often have very limited space above the interior ceiling panels — sometimes only 4 to 8 inches. Blown-in cellulose or fibreglass can usually bring ceiling insulation up to R-30 to R-40, which is better than original but still below the R-50 to R-60 recommended for NB. If there's adequate space, this is one of the most cost-effective upgrades at $800 to $2,000 for most mobile homes.

Cathedral ceiling sections (common in newer manufactured homes) require spray foam or rigid foam solutions due to limited cavity depth. These areas often leak the most heat and should be prioritized.

Air Sealing Challenges

Mobile homes typically have significant air leakage around windows, doors, electrical penetrations, and where wall panels meet. The metal construction creates unique thermal bridging — every metal stud, window frame, and door frame conducts cold directly to the interior. Thermal imaging often shows these metal components as cold stripes on interior walls.

Focus air sealing efforts on the largest gaps: around the marriage line (where sections join in double-wides), windows and exterior doors, electrical panel and service entrance, plumbing penetrations, and the connection between walls and floor. Spray foam or high-quality caulking at these locations provides immediate comfort improvement.

Moisture Management

Mobile homes are particularly susceptible to moisture problems because of their tight construction and limited thermal mass. Proper ventilation is critical — bathroom fans, range hoods, and controlled fresh air ventilation help manage humidity. The vapour barrier must be continuous and on the warm side of all insulation assemblies.

Condensation on windows is common in mobile homes during NB winters due to thermal bridging through metal frames. Storm windows or window replacement with thermal-break frames may be necessary for comfort and to prevent moisture damage.

Cost Expectations

• Floor insulation (spray foam): $3,000-$10,000 depending on size
• Wall dense-pack retrofit: $2,000-$5,000
• Ceiling blow-in: $800-$2,000
• Complete insulation upgrade: $8,000-$20,000 for a comprehensive project

Mobile home insulation upgrades typically pay for themselves faster than stick-built homes because the starting point is so poor. Heating cost reductions of 40-60% are common after comprehensive insulation upgrades.

When to Hire a Professional

Always hire professionals for spray foam installation, dense-pack wall insulation, and any work requiring access to the underside of the home. Mobile home insulation requires specialized knowledge of the construction methods and moisture management strategies that differ significantly from conventional housing.

Need help finding a professional insulation contractor experienced with mobile homes? New Brunswick Insulation can match you with contractors familiar with manufactured housing challenges in our Maritime climate.