You’re worried about setting the outside of your house on fire with a blowtorch? Ok, maybe you have several fire hazards around your house I don’t know. We don’t. There is no vegetation right next to the house (tent once and you’ll quickly learn not to do that) and the black widows are either along the back and side perimeter of the house on the stucco (hardscape pavers on the ground) or in the fire pit cracks. Rarely they’ve been on the patio table. Common sense applies and would tell you not to torch your eaves, areas where you have dead leaves, needles, trees overhanging, grasses, anything flammable, etc.
