Siding replacement becomes necessary when you notice signs of "delamination," deep cracks, or significant fading that indicates the material has become brittle. In Connecticut, "thermal expansion" can cause siding to buckle if it wasn't installed correctly. If you see mold, mildew, or rot appearing on your exterior walls, or if your energy bills are rising due to poor insulation, it’s time for a professional assessment. Minor repairs should be addressed immediately to prevent water from reaching the wood sheathing underneath.