What is a Breathable vent card?
A breathable vent card is vital in maintaining a 50mm air gap between roofing felt and insulation to comply withIrish Building Regulations, specifically Part L, which focuses on the conservation of fuel and energy. This air gap ensures proper ventilation, preventing condensation and moisture accumulation that can lead to structural damage and reduced insulation effectiveness.
Breathable Vent Card Cross Section
The Image above demonstrates the importance of maintaining a 50mm ventilation gap between the roofing felt and the insulation material. This gap facilitates airflow, prevents moisture buildup, and reduces the risk of condensation, protecting the roof structure. It ensures compliance with Part L, promoting energy efficiency and long-term building integrity.
Breathable Vent Cards Attached to Rafters
When using open-cell spray foam insulation it's essential to preserve this ventilation space. Open-cell spray foam is breathable, allowing moisture to pass through but without the 50mm air gap moisture can become trapped, leading to mold growth and timber decay. The air gap facilitates airflow aiding in temperature regulation and prolonging the lifespan of roofing materials by minimising thermal stress.
Adhering to these guidelines not only ensures compliance with Part L but also enhances the energy efficiency and durability of the building. For detailed information, refer to the Technical Guidance Document L - Conservation of Fuel and Energy – Dwellings, available on the Irish government's website.
Cullen spray foam insulation use NSAI water blown spray form insulation as apposed to chemical blown spray foam, so when you property has be insulated your living environment is warmer and healthier than before we started.
Breathable Vent Card Images
Here are some of the images of our work attics sprayed with foam and vent cards attached before foam is applied.
- All
- Vent Card
- Attic
FAQ's
The benefits of using spray foam insulation are numerous, its quick and easy to apply, is the best insulation material at creating a airtight seal filling every nook and cranny, has excellent thermal efficiency properties and is great value for money.
Using spray foam insulation helps reduce energy bills by providing the most thermally efficient airtight building envelope, keeping in the heat and preventing the cold air entering your building.
No, once sprayed the dangerous bit if over and spray foam insulation is inert.
A breathable vent card is required under Irish Building Regulations Part L to ensure escaping water vapour is able to escape your structure preventing damp and mould.
While there are many benefits of using traditional insulation material spray foam insulation stands our as its easy to apply, provides an airtight seal, if properly applied can prevent damp and mold and had super thermal properties.