Masonry walls, typically made of brick or concrete, have high thermal mass, meaning they can absorb and slowly release heat. Cavity walls in masonry homes are designed to include insulation, and although this reduces the risk of moisture retention if properly installed, it can still occur. However, steel and wood frame homes have different structural properties:
- Steel Frames: Conduct heat rapidly, making them highly susceptible to thermal bridging (cold spots that cause condensation and corrosion).
- Wood Frames: Absorb moisture easily, leading to mould growth, rot, and potential structural weakening.
- Cavity Insulation Issues: In framed homes, insulation often traps moisture, causing hidden damage over time.
The Hidden Risks of Insulating Steel and Wood Frame Homes
1. Moisture Retention & Condensation
Unlike masonry walls, steel and wood frame homes are vulnerable to trapped moisture within cavities. Insulation materials like mineral wool or blown-in fiber can absorb and hold water, leading to:
- Condensation buildup inside walls
- Corrosion of steel frames due to prolonged exposure to moisture
- Mould and fungal growth in wood frames, weakening structural integrity
2. Thermal Bridging & Energy Loss
Steel is a great conductor of heat, meaning that any break in the insulation can create cold spots. These cold bridges result in:
- Increased heat loss, making the home less energy-efficient
- Potential internal condensation, causing damp patches and damage to walls
3. Structural Damage Over Time
Moisture trapped in cavities can have serious consequences:
- Steel frame corrosion weakens the structural support of the home
- Wood rot can lead to major repair costs and even dangerous living conditions
- Damp-related damage reduces property value and aesthetic appeal
If you have a steel or wood frame home with cavity insulation, you may already be experiencing issues like damp patches, mould, or high energy bills. In such cases, removing the insulation is often the best solution to prevent further damage.
Benefits of Insulation Extraction:
Removing cavity insulation can help eliminate trapped moisture, preventing further damage to frames. It significantly reduces the risk of mould growth and structural decay in wood frame homes while also preventing corrosion in steel frames, which extends the property’s lifespan. Additionally, it can also improve energy efficiency by addressing thermal bridging issues, ensuring a more stable indoor temperature and reducing energy costs.
While insulation often seems like the right choice, the wrong type in the wrong structure can lead to costly problems. Homeowners with steel or wood frame homes should be cautious about cavity insulation and consider expert advice before installation. If you already have insulation causing issues, extraction may be necessary to protect your property.
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