General rule of thumb: If it wasn’t there when your siding was installed, it probably shouldn’t be there now. Dents, dings, cracks, gaps, pests — all of these things can wreak havoc on your siding if they aren’t properly treated. While purchasing and installing new siding may not be as fun as those other home improvement projects you’ve been saving for, sometimes it’s downright necessary. But it’s not all drab; new siding can increase your curb appeal and resale value, providing quite the return on investment when done correctly (and at the right time). If you’re weighing which home improvement project it’s time to do next, consider these four situations to determine if new siding should be at the top of your list.