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You can install a spray foam roof over shingles, but it may compromise the roof’s protective qualities or shorten its lifespan. Before installing a new roof, ask a qualified roofer if your existing roof needs to be removed before installing a spray foam roof so you ensure your home has quality, long-lasting protection. 

Depending on the type of damage your roof shingles have, you may be able to simply repair them without having to replace them. However, if there are more than a few to repair, replacement is likely the easier option. You may only need to replace a few of them. Repair shingles by applying roofing sealant directly under the shingle's damage and then directly over it. 

Asphalt shingles have varying thicknesses across the length, so failing to stagger shingles from one row to the next will leave you with bulges and bumps if the thicker sections stack on top of each other. Not only is this unappealing, but it increases the risk of water intrusion. Stagger each new row by 6 inches to avoid this issue.

The most important thing to remember when laying shingles is to work from the bottom of the slope to the top. This leaves you with a top overlap that directs runoff from one row to the next until it reaches the eave for disposal. You should also make sure you follow the manufacturer's instructions and the local building code for nailing patterns and frequency so all of your hard work stays put through varying weather conditions.