Project location: Dingley Village
The current roofing sheet in place is composed of polycarbonate corrugated sheets that have been in use for over a decade, displaying signs of aging and yellowing. The customer has expressed the desire to replace this plastic roofing with clear glass-like polycarbonate roofing.
The existing veranda has more than 5 degree slope, and exisiting gutter, and frame condition are very well. The timber rafter distance from center to center, measures precisely 800mm, with additional battens situated on top of the rafters.
Which way polycarbonate roofing can be installed onto supporting structures?
1. On top of purlins. When your structure has purlins/Battens, fixing screws are placed through the Aluminium Joiners and screwed into the Purlins to hold it in place.
2. On Rafters only. Normally there are no purlins in these designs. Aluminium H-Bar Joiners will sit on top of the rafters.
For this case, Excelite Polycarbonate roofing sheets will be sitting on top of purlins.
Upon consultation with the customer, they have approved the utilization of the Excelite W800 solid flat Polycarbonate locking system. This polycarbonate roofing system entails flat plastic roofing sheets with standing edges securely positioned on joiners, offering excellent waterproofing. The sheets have a thickness of 4mm and are transparent in color. The length is 3600mm, it's one of Excelite's standard size, no wastage.
Excelite team spent one day for old Pergola roofing remove and new plastic roofing Installation. 7 sheets are used, and all edges are effectively covered with flashing, excluding the sides where water is directed into the gutter.
How Much Overhang on Plastic Roof For Gutters?
Typically, plastic roof sheets should have a 50mm overlap into the trough of the gutter, ensuring proper water drainage.
Accurate measurement of the overhang and drip edge is crucial in working with polycarbonate roofs, as any inaccurate cuts are irreversible. Special attention must be given to the overhang and drip edge during the measurement of the pergola roof.
How do I stop cracking noises from my pergola?
Normally there will be 2 noises if you didn't install your pergola properly.
1, If you drill the polycarbonate roofing panels into your frame direclty, and didn't allow any expansion gap, the cracking noise may happen when there is a change in the weather, the noises start when the sun comes out and become hot, last for about few minutes, they start again when the sun goes away and temperature is colder and so on every day.
To Solve this problem, you need Aluminium joiners, and try to avoid penetration of the polycarbonate sheeting, and leave some expansion space in the joiners.
2, Wind blows the polycarbonate roofing sheet, and make noise when it contact directly to the purlins(Battens)
To solve this problem, you just need Anti-noise tape.
It's essential to note the application of white tape on top of the roof battens beneath the polycarbonate sheet. This noise tape is a crucial component in all polycarbonate roof installations involving battens, aiming to minimize cracking and creaking due to adverse weather conditions, especially Melbourne's extreme winds. The foam noise tape is placed on top of the roof battens before securing the polycarbonate sheets, enhancing the longevity and stability of the roofing structure.
Polycarbonate roofing purlin noise stop tape helps stop your clear roofing from creaking, which can be caused by changes in temperature. It gets put on the purlins (battens that run 90deg to the way the sheets run) and the polycarbonate screws go through it. It does not need to go on the rafters.
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