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Fascia and Soffit Board Installation: Your How-To Handbook

20 October 2023


Your Guide to Installing Fascia and Soffit Boards

For homeowners and contractors alike, understanding how to install fascia and soffit boards properly is essential for both aesthetic and functional reasons. These boards play a pivotal role in safeguarding your roof and enhancing its appearance. This article breaks down the installation steps for 18mm Fascia Boards, 9mm Soffit Boards, and 9mm Hollow Soffit Boards. If you're planning an installation soon, here's everything you need to know:

18mm Fascia Board Installation:

Direct Fix Advantage: One of the main benefits of these 18mm thick fascia boards is their design for a direct fix. This eliminates the need for a timber substrate. These boards can be directly fixed to the rafters, spaced at a maximum of 600mm centres. Secure them using 2 x 65mm A4 stainless steel fixing nails per rafter.
Ensuring Level Rafters: Before starting the installation, double-check that the rafters are level to avoid any alignment issues.
Considering Trims: When using white corner trims, joint trims, or angle trims, ensure that the boards are cut back by 5mm on each edge to account for expansion. For laminated boards, this dimension increases to 8mm per edge. Secure all trims by gluing one side, leaving the other side free for expansion or contraction.
Securing the Guttering: Attach the guttering to every third rafter. Given the thickness of these boards, they can accommodate extra fixings securely at different points.

Important: When using foiled or laminated boards, ensure they're fitted in lengths not exceeding 2.5m. This accommodates expansion requirements, especially crucial for south-facing elevations.

9mm Soffit Board Installation:

Preservation First: Before fixing the soffits, ensure the preservative treatment applied to the structural timber has dried completely.

Fixing Utility Boards: Utility boards ranging from 100mm-605mm in width should be fixed at a maximum of 600mm centres.
Ventilation Needs: If your roof requires ventilation and has a pitch greater than 15˚, consider the Eurosoffit board available in widths between 150mm-605mm. This provides the necessary 10mm air gap.
Alternative Ventilation: Another method involves using the rigid soffit ventilator to join the Euroboard with the utility boards.
Over Fascia Ventilation: If ventilation is achieved using over fascia ventilation, position the utility board on the ogee or Euroboard leg. Secure it to the soffit batten using 30mm A4 stainless steel fixing pins.

9mm Hollow Soffit Board Installation:

Width Options: These alternative soffit boards come in 300mm and 100mm widths. They can be installed either at right angles or parallel to full replacement boards, offering a visually appealing tongue and groove effect.
Ventilation Considerations: If no ventilation is required, the hollow soffit can rest on the Euroboard leg and be fixed to the soffit batten with 25mm cladding pins. If ventilation is a must, these boards can be pre-vented and installed in the same manner.
Soffit Ventilator Profile: This can be utilized to connect the Euroboard fascia and hollow soffit board. When the hollow soffit board runs lengthwise, the first plank's location leg should be removed, ensuring it fits snugly into the soffit ventilator.

Hollow soffits are exclusively designed for specific applications and are not suitable as external cladding or fascia systems. Using them inappropriately will render the guarantee void.

Installing fascia and soffit boards requires attention to detail and adherence to best practices. With the guidelines provided above, you can ensure that your installation process is smooth, efficient, and up to industry standards. Remember, a proper installation not only improves the aesthetics of your property but also ensures longevity and functionality.

Learn more about fascias and soffits with our comprehensive guide of everything you need to know.

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