When it comes to installing polycarbonate or acrylic roofing sheets, whether for a Pergola Roof, greenhouse or commercial building, it’s essential to ensure everything is done correctly to maximize life span and durability. While these materials are known for their excellent weather resistance & light transmission, improper installation can lead to a range of problems down the line—leaks, warping, or even reduced lifespan.
In this blog, we’ll explore some of the most common mistakes people make when installing polycarbonate and acrylic roofing and share expert tips on how to avoid them.
1. Pre-Installation Preparation
Mistake: Starting the installation without proper planning can cause major issues during or after the process.
What to Avoid:
- Not measuring the roof area accurately.
- Not checking how much fall (roof pitch) the roof has.
- Not checking the condition of the existing structure.
- Not checking rafter & purlin spacings.
- Using the wrong type of roofing sheets (e.g., choosing the wrong thickness or profile for your specific project).
Pro Tip: Take the time to carefully measure the roof, ensuring that you account for all angles, corners, and any obstacles. Measure the roof pitch to ensure it has enough fall, we recommend a 5° fall which is around 88mm per meter. Check the condition of the structure and prep it by clearing away any debris. Carefully measure the rafter and purlin spacings, this is important when it comes to choosing the right roofing material. Following these tips will help prevent any headaches later and allow for a smooth installation. Remember, we are here to help! give us a call if you get stuck and we can help with any questions you may have. Contact us here
2. Improper Fixing and Fastening
Mistake: One of the most frequent issues in roofing installations is using the wrong fasteners or incorrectly fixing the sheets to the structure.
What to Avoid:
- Using standard nails or screws instead of appropriate roofing fixings (such as polycarbonate-compatible screws with rubber washers).
- Over-tightening or under-tightening screws, which can cause cracking, distortion, or improper sealing.
Pro Tip: Always use the recommended fixings for your polycarbonate or acrylic roofing sheets. These materials require specific types of screws that can handle the material’s expansion and contraction without causing damage. Ensure you pre drill an expansion hole through the sheet first which is about 2-3mm wider than the screw. Ensure the screws are tightened firmly, but not too tight, to allow the material to expand with temperature changes.
3. Failing to Leave Room for Expansion and Contraction
Mistake: Polycarbonate and acrylic sheets are sensitive to temperature changes and can expand or contract depending on the weather. Failing to leave adequate room for this movement can result in warping or cracking over time.
What to Avoid:
- Installing the sheets too tightly together, leaving no gap for expansion.
- Not allowing space for the materials to shift with temperature fluctuations.
Pro Tip: Always leave a small gap (about 3 -5mm) between acrylic or polycarbonate flat sheet to allow for expansion and contraction. Be mindful of the manufacturer’s recommendations on spacing, as this will vary depending on the sheet type and thickness.
4. Not Following Manufacturer’s Guidelines
Mistake: Every roofing material has its own set of installation instructions, and ignoring them can lead to problems with the material’s performance.
What to Avoid:
- Overlooking the specific recommendations provided by the manufacturer.
- Not considering the warranty terms and conditions.
Pro Tip: Always check the installation instructions provided by the manufacturer. They’ll have specific recommendations about fasteners, installation techniques, and maintenance guidelines that are crucial to the longevity and performance of your polycarbonate or acrylic roofing. Ask our team if you are un sure! Contact us here or you can check out our range of product brochures for more information Product brochures