• Clean all debris from the surface of the roof. This includes debris that has gathered behind HVAC units, pipes and pitch pans, and any other roof penetrations. If your roof is starting to collect moss or algae, install some zinc or lead control strips.
• Keep all fungus and algae from the surface. Install zinc control strips along the hips and ridges if necessary.
• Check all flashings and make sure that they are not deteriorated and there are no holes in them.
• Keep all gutters free of debris. Make sure that the downspouts are draining properly by water testing them.
• Trim back any overhanging tree branches.
• Check all caulking and sealants. Scrape and remove any caulking that is weather cracked and damaged. Clean the area thoroughly. Use a wire brush if necessary. Reapply a polyurethane caulking such Vulkem, NP-1, or equivalent.
• Check the mortar on the chimney, both in between the brick and on top. If it’s damaged or deteriorated, have it tuck-pointed. Any mason can perform this work.
• Check the open valley metal for rust. Wire brush the rust then prime and paint the metal.
(Information from roofhelp.com)
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