No, you do not need to add anything to your measurements for edge overlap, borders, or fastening allowances—our system calculates everything automatically to ensure your Pikkuroof fits correctly and installs easily.
Automatic 5 cm Border on All Sides
When you enter your roof opening dimensions in our calculator, the system automatically adds a 5 cm (approximately 2 inches) border around all four edges of your measured opening. This means if you measure a 3-meter × 4-meter roof opening, we manufacture a panel approximately 3.10 meters × 4.10 meters—the extra 10 cm on each dimension (5 cm per side) provides the working border needed for proper installation. You'll never receive a panel that's exactly your measured size because the border is essential for installation mechanics.
Why the 5 cm Border Exists
The border serves multiple installation functions: It provides material that extends beyond your outermost rafters, giving you something to grip and pull when stretching the panel taut during installation. The border folds over the edges of your outer rafters, allowing you to drive screws through doubled material for extra holding strength at the perimeter. Extra border material accommodates minor dimensional variations in your handmade custom panel (remember, Pikkuroof is flexible PVC, not rigid plastic—1-2 cm variations are normal). If your panel arrives slightly oversized, the border can be easily trimmed with a standard utility knife after installation is complete—simply cut away excess material along the rafter edge for a clean finished appearance.
What You Measure vs. What You Receive
To clarify the relationship: If you measure a 3.00 meter × 4.00 meter opening and enter these dimensions in our calculator, we manufacture a panel approximately 3.10 meters × 4.10 meters (adding 5 cm to each edge). During installation, you'll stretch this 3.10 × 4.10 meter panel across your 3.00 × 4.00 meter opening, with the extra 10 cm providing working material at each edge. After fastening, if any border extends beyond your rafters, trim it flush with a utility knife. This automatic border system ensures that every Pikkuroof panel fits properly without customers needing to perform complex calculations or worry about adding overlap allowances to their measurements.
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