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The Truth About Cavity Wall Ventilation
Let’s delve into the frequently misunderstood topic of cavity wall ventilation. Hosted by Roger Bisby from the Skill Builder channel, this discussion addresses one of the most common questions homeowners and builders face: Should cavity walls be ventilated, or is sealing them a better option?
Cavity walls are a crucial component of modern home construction, designed to prevent water penetration by creating a barrier that allows rainwater to drain harmlessly to the ground. However, adding insulation and air bricks has created confusion about whether cavities require ventilation to “breathe.”
Roger debunks misconceptions, such as the belief that air bricks ventilate the cavity. Instead, he clarifies their role in ventilating subfloor spaces or providing direct airflow into rooms. He also explains the importance of sealing the top of the cavity to prevent issues like loft condensation caused by evaporating dampness from open cavities.
The video highlights how a sealed cavity improves insulation performance. Eliminating air movement makes trapped air within the cavity a natural insulator, enhancing energy efficiency and reducing heat loss. Practical advice includes using mastic or silicone to seal gaps around windows, doors, and other openings, ensuring maximum insulation value—even without additional cavity wall insulation.
Whether you’re a homeowner looking to improve your property’s insulation or a professional seeking clarity on best practices, this video provides straightforward, actionable guidance on cavity wall ventilation. With over 1,000 home building and renovation videos, the Skill Builder channel is your go-to source for tackling common construction challenges.
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Cavity Wall Ventilation – What You Need To Know
🎯 Purpose of Cavity Walls: The primary function of cavity walls is to stop water penetration by allowing rain to run down the cavity and soak into the ground.
🛠️ Common Misconceptions: Air bricks are often misunderstood; they ventilate the subfloor space, not the cavity itself.
❌ Sealing Is Key: Open cavities can lead to condensation issues in the loft due to evaporation. Proper sealing prevents air movement, improving insulation.
💡 Insulation Benefits: Trapped air within a sealed cavity acts as a natural insulator, enhancing energy efficiency.
🔍 Practical Advice: Seal gaps around windows, doors, and air bricks using mastic or silicone to optimize the cavity’s insulation.
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