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Thread: Nail disaster

  1. #1
    Join Date
    Sep 2012

    Default Nail disaster

    We recently bought our home and are doing the prep to prepare it for painting. Our problem is that the paint is flaking off the plywood over the porch(in some part due to the wrong size nails used by the roofers prior to our ownership. The nails have been sawed off). Everything seems like a PITA.

    Getting a new roof is out of the question through this is the best solution.

    Placing new plywood boards over seems costly.

    Sanding this down seems like a good option. The belt sander was awkward. We're thinking maybe we could rent a grinder. Has anyone else dealt with this? Any other ideas?

    I would post images but I'm under the post count.

  2. #2
    Join Date
    Aug 2007

    Default Re: Nail disaster

    It is unfortunate that you have to clean up this mess, it happens more frequently than you might think, even when the roofer uses care to select the proper nail.

    Any nail over about 1/8" will need to be ground off with a grinder. You can use a belt sander, but odds are the sharp tips will eat the belts before you get much area done. A small handheld angle grinder will work great for this, you will need to be careful and grind slowly so as not to overheat the nails and burn the wood or melt the roofing they're holding down. Lest you thing this wouldn't happen, it only takes a second for the tip of that nail to glow red hot, it will burn anything touching it. So, you will basically "tap" the tip of the nail with the grinder a time or two and move to another nail, work across 3 or 4 nails at a time and you won't have over heating problems.

    Once you get the tips knocked down, you can switch back to a belt sander or an orbital sander, again the belt sander will be fast, but it will also cause heat very quickly, so don't over stay your welcome on any one nail.
    Come to Hidden Content for all your DIY needs

  3. #3
    Join Date
    Jul 2010

    Default Re: Nail disaster

    A hand held grinder with a metal blade can take care of the nails that came through the plywood.

    Caution: don't grind into the plywood.

  4. #4
    Join Date
    Dec 2007

    Default Re: Nail disaster

    If I understand your post correctly, the nails have already been cut off and you want to repaint the underside of the porch roof. The original paint has failed and you want to know how to prep the plywood for new paint so that it doesn't fail. Is this correct?

    The problem with sanding is that the nails will shred the sandpaper, even though they are now cut flush to the wood.

    It is possible that the paint failure is due to either improper preparation or just plain cheap paint, possibly with no primer. It could also be due to a leaking roof, if any water gets through the roofing materials and gets the plywood wet, the paint will not stick, no matter how well it was prepared or how high the quality of the paint.

    If the roof of the porch remains dry after a good rain, then You should be able to sc**** off any loose paint, light sanding with a block and sandpaper, no machine sanding, and then a good primer followed by a high quality finish coat.

  5. #5
    Join Date
    Mar 2008
    nova scotia, canada

    Default Re: Nail disaster

    your better off just putting up solid soffit. it will clean things up far better than trying to sand and paint that mess
    fire up the saw and make some dust

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