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The living space of a home doesn’t correlate directly with how many square feet of siding you’ll need, but on average, a 2,000-square-foot home will need 1,700 square feet of siding or 17 squares of siding. Your siding measurements will vary depending on the layout of your home, the number of stories, the size of your doors and windows, and even your roof style.

You can put new siding over clapboards, but it’s not recommended. Some sidings, like vinyl siding, can go over clapboards with sheathing like a foam layer in between. However, it’s best to remove clapboard siding if you plan on replacing it with new siding. Burying wood clapboards underneath new siding can create risks of rot and mold, or hidden insect damage. It can also create warping issues over time. Removing clapboards allows you to properly install a new sheathing, as well as clean up the exterior wall and look for any signs of damage.

Hail as small as 3/4 inch (about the size of a penny) can cause damage to your siding. When hail reaches 1 inch in size, you can expect to see more cracks, chips, and holes, and hail that’s 1 and 1/4 to 1 and 1/2 inches around will cause significant damage. If you see hail that’s 1 and 1/2 inches to 2 inches or more in size, the damage is likely to be extensive and possibly even dangerous.

Traditionally, you place a layer of ⅜-inch foam board beneath aluminum siding. This gives you a smooth surface to which you can fasten the trim and siding. Beneath the foam board, you should have some kind of waterproof sheathing to further protect your home from water damage. It’s possible this sheathing is already under your current siding.