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Roof blistering and hail damage are different in their physical appearance. Blistering, often caused by inadequate ventilation, low-quality material, and improper installation, looks like large, irregular bubbles popping out of your roof. Meanwhile, hail damage is usually circular or oval dents entering your roof and often follows the same path as the hail storm.

You shouldn’t put a new roof underlayment over an old one for a few reasons. Old felt must be removed in order to assess the condition of your roof decking, such as rotting wood or other structural issues. Also, if your roofer doesn't install a fresh layer of felt as is required by shingle manufacturers, your warranty may be voided. Finally, old underlayment removal is often included in the cost of roof repair or replacement, so there's no real benefit to leaving it on before installing a new layer.

It is not always necessary to put wood stripping (also called furring strips) under a metal roof, but some metal roofs require stripping to work efficiently. For example, you must use furring strips when installing metal over shingles in order to connect the shingles to the metal roofing. These strips are made of metal or wood. They create thermal breaks and provide a solid frame to which you can attach the metal roofing. A lack of wood stripping can cause condensation issues under certain roofs, so use the roofing manufacturer’s specifications as your guide.

Walking on an asbestos roof can pose a risk. Asbestos roofing materials can become brittle over time, increasing the chances of them breaking or releasing fibers when stepped on. Additionally, walking on an asbestos roof without proper precautions can cause further damage to the material. If possible, avoid touching an asbestos roof in any way and consult with a professional about removing and replacing the roof.