Installation of uPVC roofing sheets

Installation Of uPVC Roofing Sheets

Cutting tools

Angle grinder: The fastest option. Wear hearing and eye protection. Paint or prime cut edges to prevent rust.

Circular saw: Slower than angle grinder, but follow same instructions. Use a metal blade and expect it to wear quickly.

Nibbler: Effective if rated for the right metal and gauge.

Tin Snips: Slow but safe. Wear work gloves and find the longest pair you can.

1. Install trusses and purlins with good quality materials. It can be high quality wooden, metal or stainless steel. The distance of trusses and purlins should be conformed to standard of supplier’s instruction.

2. Install the panels. Place them directly onto purlins that are attached to the roof trusses, beginning on the outside edge.

Close or seal off the ends with a wood or plastic strip under the panel at each end. These will stop the entry of rain, wind and pests.

3. Pre-drill holes on the ridges. Use a proper drill bit.

4. Screw down the panels. Continue across the roof until it is completely covered, lapping over the previous panel by two wave (about 125mm) for corrugated type PVC sheet (at least 63mm minimum) and one wave for trapezoidal type roof sheet . Adjust the lap so that the last panel completes the coverage without making a cut lengthwise.

5. Complete the opposite side. If your roof is two-sided (and not just a single slope), repeat the installation on the other side of the roof, and install a corrugated ridge cap as you proceed across with the panels.

Cautions

*The purlins support the panels. If you are placing PVC sheets over an existing roof, you still use purlins. The purlins not only give you something other than the existing roof to accept the roof sheet fasteners, they also create an airspace between the roof sheets and the existing roof. Without the purlins, the roof sheets would sit directly on the existing roof, you would get moisture building up under the roof sheets.

*Roofs aren't for standing on. There's a good chance you'll damage a corrugated roof by standing on it. Therefore, when installing PVC roof sheet, we’d better step on the position where supported by purlins or trusses.

*On a corrugated roof, always fix at the top of the ridge to minimize the run -in of moisture.

*Do not drill holes for the screws in the valley of the ridges to prevent leaks

Summery:

*To install corrugated roofing, start by cutting your panels to length with an angle grinder.

*Next, pre-drill holes on the end and side ridges of the panels, spacing the holes 6 to 8 inches apart.

*Beginning at the outside edge of your roof, place each panel directly onto the purlins that are attached to the roof trusses.

*Screw down the panels using the pre-drilled holes, then continue across the roof until it is completely covered.

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