Protecting installed shingles comes down to minimizing direct foot traffic on them and taking precautions against wind and handling damage. Walking on installed shingles can crush the surface granules, crack or lift shingles, and loosen fasteners, especially with repeated or heavy traffic. When you must access the roof, lay down sturdy planks or boards to spread your weight and create a safe walking path that keeps most of the surface intact. During wind events, cover exposed areas or secure anything that could be lifted or blown away to reduce the chance of wind damage. Handle shingles gently when lifting or repositioning them to avoid cracking or deforming edges and to preserve the seal. This approach protects the shingles far better than walking directly on them or removing shingles during windy conditions.