How to replace Polycarbonate Roof?

[calccom21]

Hi, need some advise - i have existing laserlite 2000 trimdek profile roof (clear) and i wanted to replace it with laserlite 3000 greca profile (or different brand - greca profile). As the existing would have the screw hole in the metal structure beam, when i replacing it how do i aligned and screw it align to the hold in the metal beam. Any advise? since it is different profile - is it advisable to removed the clear and aligned to the top of the new color roof and do the marking (eventhough both different profile)?

[EricL]

Hello @calccom21 

Thank you for sharing your question about replacing your polycarbonate roofing. I believe one of the important things to take into consideration is compatibility. The new sheet must fit in with the old one so that there will be no opportunity for rainwater to get through.  If the sheets fit together, you can use the same mounting holes that you currently have now. I suggest marking the new sheet with a highlighter and drilling pilot holes for ease of installation. My best advice is to make sure that the new sheet is compatible and that it covers the old space properly.

Let me call on our experienced members @Dave-1, @Nailbag and @AlanM52 for their recommendations.

If you need further assistance, please let us know.

Eric

[Dave-1]

Good Evening @calccom21 

I was wondering why you need to reuse the existing screw points instead of putting new ones in when you change the sheet over.

Then I noticed the top side of the slope of roof, it looks like it still continues upwards. If you are replacing the sheet with a different profile then the transition will be different with the potential for water to make its way in. Same for the bottom overlay, if the shape is too different it wont sit flush nd you will end up with potentall issues as well.

If you are after something that will diffuse the sun more so, why not install that new sheet you are thinking on the underside of the roof, that way you get the sun protection and it stays watertight.

Dave

[calccom21]

Hi @Dave-1 can you help me understand what you mean by top side of the slope of the roof and still continue upwards? Also what do you means by installing new sheets underside of the roof? Means 2 layer? Also i was thinking to re use the hole do that I don't have to drill another hole in the metal frame to support the roof

[EricL]

Hello @calccom21 

"Means 2 layer?"

That is exactly what @Dave-1 is suggesting. Instead of removing your old panel, you can install the new panel at the bottom of the steel frame so there will be a gap. This is on the condition that the new sheet is not a clear one but perhaps a translucent one to prevent full sunlight from coming in. Let me tag @Dave-1 to make them aware of your questions.

Eric

[calccom21]

Thanks. Will that need to be same profile? I still can't visualise how I can fit onto bottom.. Means I loosen the bold and add to it? Middle of it there is a beam support. Means I cut the roof to half? What do I need to or use to support the bottom roo any photo?

[AlanM52]

Hi @calccom21,

Disregard the previously drilled holes, simply lay down the new sheets in the usual way but check that each drill point is flush or not 'too squishy' and if not (maybe profile issue as @Dave-1 mentioned) pad underneath with a window packer.

If needed I trim the packers so they hidden from view.

Cheers

[EricL]

Hello @calccom21 

The new panel will be attached at the bottom of the steel frame the old and new do not come together. The sheets don't need to come together, and you can leave the top section alone. For a better perspective the old sheet stays on top of the steel frame and the new sheet will be installed at the bottom of the steel frame. It's like a sandwich with steel in the middle.

Eric

[calccom21]

Ah.. Thanks it will then looks weird with a hole in between e the 2 frame because the section where the beige colorbond and clear there no metal beam seperating 

[Nailbag]

Mixing any roof sheet profile is always going to be problematic, Sony question back is why you’re replacing the clear sheet as it appears to be in good condition?

Nailbag