Solar in St. Louis has to live with mature tree shade, brick roofs, and wind off river storms, not with a hail-first plan. A south slope under a big hardwood may be shade all summer. A parapet or a neighbor's wall can cut the day on a flat roof. The deck and the flashing come before modules. If the membrane ponds or the steep roof already leaks in a downburst, it is not a platform. Say which roof you have.
Say which way the ridge runs and what stands south of it. Look at midday and again late, from the yard, because the canopy lies. A hip on a brick house is not a simple gable. Low-slope mounts catch uplift when storm wind gets under them. Penetrations have to outlast driving rain, not a clear week. Snow is a short guest here compared with the north, and it is still worth naming if the pitch will not shed.
Fasteners have to reach structure on roofs that may be layers old. If pigeons or squirrels already use the edge, they will use the gap under an array. Say so. Do roof work and array work in an order that opens the covering once. An inverter needs air in this humidity; a sealed attic is a poor closet. A multi-family building may have more than one meter. Say which building you mean without inventing a label.
Output drops under long humid cloud and storm weeks, and a bright stretch still depends on a clear south. Do not describe a shaded east face as that south. Tree limbs that will fall in the next blow are part of the site. Mention them. A ponding parapet that shades the roof is both a water problem and a shade problem. Handle the water in the description before the modules. Gear has to accept heat and sudden wind.
Lead with the roof, the trees, and whether storms already drive water at the flashing. Name brick house or flat roof. Call the number on this page.