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Any need to repaint polycarbonate covered pergola

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  1. #1
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    Default Any need to repaint pergola before covering with polycarbonate

    Covering an old hardwood pergola with poly sheeting.
    The wood should stay dry and somewhat protected from UV due to the polycarbonate.
    The paint on the topside of the pergola slats has failed and is flaking across 80% of the surface.

    My questions:
    Would stripping and re-painting the top side of the pergola slats give them any extra durability, or will they survive ok unpainted under the poly?
    They are hardwood and are therefore not treated.
    Should I be worried about condensation or damp settling on the top surface in between the poly and the timber?

    Stripping and re-painting would involve A LOT of additional work, not to mention the cost of the paint. Aesthetically I don't care since no one will see the top. So I'd rather avoid this step if it isn't entirely necessary.

    H3 purlins will sit on top of the slats to create fall and the poly will screw into the purlins. I was planning on painting just the purlins since water loves to find it's way into the screw holes.

    Is stripping and re-painting the slats necessary or overkill?

    TIA

  2. #2
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    Have a good look cause you may find wet rot in the battens.

    I have just done what you are doing and I ran the sander over the battens and repainted before sheeting with sun tuff.

    What I did which is not the norm is screw the sheets in the valley's of the corrugations not the ridges, reason being less leaks than when screwed on the ridges.

    My sheets are only 1100 long.

    I used 25x12 type 17 hex screws with neo washers.

  3. #3
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    What made you decide to repaint?

    And why do you believe screwing in the valleys will yield fewer leaks? Surely the manufacturer would recommend it if that were the case.

  4. #4
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    Quote Originally Posted by Stuckster View Post
    What made you decide to repaint?

    And why do you believe screwing in the valleys will yield fewer leaks? Surely the manufacturer would recommend it if that were the case.
    Repaint was necessary due to a colour change on the front of the house but it was due anyway along with some repairs and removal of rotten timber.

    Suntuf/plastic sheeting is not easy to screw neatly when screwing the ridges of the sheets and yes, all sheets should be screwed at the ridges,

    but being short sheets and having a heap of the 25 timber fix screws plus,

    the battens are only 25 mm thick otherwise I would have to change battens or the 50 mm screws would have gone through the batten and shown up underneath.

    I decided to screw the valleys.



    Attached Thumbnails Attached Thumbnails pergola.jpg  

  5. #5
    Je pense, donc METRIX's Avatar
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    Quote Originally Posted by cyclic View Post
    What I did which is not the norm is screw the sheets in the valley's of the corrugations not the ridges, reason being less leaks than when screwed on the ridges.

    My sheets are only 1100 long.

    I used 25x12 type 17 hex screws with neo washers.
    You wouldn't do that where I live, many gum trees around the house, the leaf letter will build around the screw heads within a week and be a ongoing maintenance issue forever.
    Mieux vaut prévenir que guérir

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    Quote Originally Posted by METRIX View Post
    You wouldn't do that where I live, many gum trees around the house, the leaf letter will build around the screw heads within a week and be a ongoing maintenance issue forever.
    That's what chain saws are for.

  7. #7
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    Just bumping this with an image of the job.
    Couldn't figure out how to attach images to the original post (apparently there's a file size limit which you have to guess).

    Any other opinions/advice on whether to strip and repaint would be much appreciated.

    Attached Thumbnails Attached Thumbnails img20220507115730b.jpg  

  8. #8
    Community Moderator phild01's Avatar
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    Quote Originally Posted by Stuckster View Post
    (apparently there's a file size limit which you have to guess).
    Yes, under 1mb should be fine.

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