What trim or flashing for a pergola?

[Martin5]

 Recommendations on Trim / Flashing options for pergola where the sheeting have a drop

[MitchellMc]

Welcome to the Bunnings Workshop community @Martin5. It's great to have you join us, and many thanks for your question about roof flashing.

How far do those timbers extend out from the roof sheeting? If it's under 100mm, you could use a Fielders 2.4m 100mm Zinc Angle. Alternatively, there's the Suntuf 3.0m Clear Polycarbonate Barge Cap that's 130 x 110mm.

It would be best to remove the last row of screws and fix the flashing into position. A bead of Sikaflex 11FC can be used between the flashing and the roof sheet to seal the area.

Please let me know if you have any questions.

Mitchell
 

[Martin5]

Thanks MitchellMc for replying.

I'm looking to cover the colorbond sheeting and the batons. In the old set up we had fibreglass sheets which started to give way from wind blowing the sheets to cause it to rattle and loosen the exposed timber had wood rot.

The batons extends out about 4" which I've planned to cut as close to the rafters. The heights of the batons are 120mm, 90mm, 70mm and 35mm.

Please let me know if the above option works.

[EricL]

Hello @Martin5 

I would probably recommend the Suntuf 3.0m Clear Polycarbonate Barge Cap which is 130mm x 110mm. It is the bigger of the two width wise, but what is the overall length you are covering? The flashing is only 3 meters long and if the area is longer than that a second piece will need to be used.

If you need further assistance, please let us know.

Eric

[Martin5]

3.5 meters sheet length

[MitchellMc]

That's unfortunate @Martin5. You'll need two flashing lengths to cover the space, which can be overlapped.

Mitchell

[GayleD]

Hi Mitchell,

When using the Suntuf polycarbonate barge, do the screw holes need to be wider than the screw for expansion (as they do in corrugated sheets)?

Gayle

[JacobZ]

Hi @GayleD,

Welcome to the Bunnings Workshop community. We're thrilled to have you join us.

Yes, the screw holes should be wider than the shaft of the screw to allow for a little bit of expansion.

That is why the recommended Suntuf Clearfix Roofing Screws have the wings I have highlighted below, to ensure the hole in the polycarbonate sheet is wider than the shaft, but smaller than the screw head.

Let me know if you have any further questions.

Jacob