Is this product water impermeable so can be used outdoors or in a car park to clad pillars.

Thank you for your inquiry about the 12mm STS Construction A1 Fire Board.

While the board itself is weatherproof and suitable for outdoor use, it's important to consider the entire system when using it as a cladding material. This includes the render base coat primer, render finish, and the installation process.

To ensure long-term durability and performance, we recommend consulting with a professional builder or plasterer. They can provide expert advice on the specific materials and techniques needed to achieve a weatherproof and durable finish.

Please note that while the board is fire-resistant, it's not fireproof. For applications where fire safety is a critical concern, additional fireproofing measures may be necessary.

For further information on the board's specific properties and suitability for your application, please refer to the product datasheet.

We hope this information is helpful. If you have any further questions, please don't hesitate to ask.