Ok so we have a shingle roof that needs to be replaced. We are having some lumber logged off to pay for the repairs. We need to make it for about another 3 months. I was planning on using half inch pressure treated plywood and screwing it down with the roofing screws for metal roofing, caulking around the edges with henry wet patch caulking, and putting the caulk around each of the screws. So my question is will it be ok to screw plywood over the top of worst leaks and caulk the edges till we get the roof replaced? Or rather will this repair last for the three months we need?
I would think that some rolled roofing installed in horizontal overlapping strips starting from the lower edge of the leak area would be a much better temporary solution than mucking around with the plywood idea.
Rolled roofing will be much better to seal to the existing shingles at the ends of the strips and along the top edge of the upper most run. It may very well be lower cost that the plywood and is certainly more adaptable to size of area to be covered in a temporary way.
Rolled roofing is normally installed in such a way that the lower edge is top face nailed with exposed nails. The upper edge is then nailed but the next strip comes along with some overlap and will cover up that upper row of nails.
Use good old google to search with "rolled roofing installation" for links to sights and videos on the subject.
Note: If your roof has large areas with severely rotted roof decking use great care when navigating around on the roof to avoid crashing through and risk of serious injury.