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While you can technically install new roof sheathing over an old layer, it is generally not recommended for several reasons. Installing new sheathing over old can trap moisture, which may lead to future problems, especially in humid climates. It also adds significant weight to the roof structure and prevents you from inspecting the original sheathing for rot, mold, or other damage.

However, in some cases, if the old sheathing has been thoroughly inspected and is in excellent condition with no signs of rotting, warping, or damage, a roofer may install new sheathing over it to add strength and stability. Despite this, the more common and recommended practice is to remove the old roof sheathing entirely before installing a new layer, as removing it is not a difficult task.

Before hiring a roofing contractor, it's wise to ask several key questions. Inquire if they are licensed for roof replacement and repair and if they hold any special certifications. Ask if they will be completing all the work themselves or subcontracting parts of it. It's also important to understand the project timeline, whether they will remove the old roof or place new shingles on top, and how they will handle cleanup after the project is complete. Finally, ask about warranties for both work and materials, what recourse you have if issues like leaks arise, and if they can provide customer references.

While a severe hailstorm can cause serious damage, it does not automatically mean you need a full roof replacement. The necessity of a replacement often depends on the age and prior condition of your roof. Unless your roof was already aging or in poor shape, a full replacement is often not required, and it can be difficult to get insurance approval for one. The most reliable way to determine the extent of the damage and whether a replacement is needed is to contact a professional roofing company. An experienced contractor can perform a thorough inspection, identify any hidden damage, and advise you on the best course of action.

You can tell if you have ridge vents by looking at the roof’s peak from outside. A ridge vent will look like a speed bump or slight rise away from the roof’s surface and will likely be covered in the same material as the rest of the roof. You can also tell from inside your attic—look up at the roof ridge to see if there is light coming through along the length of the ridge.