After "spider," the phrase "builds its web" is understood information. It can be made clear. Alternate translation: "He builds his house as a spider builds its web" (See: [[rc://en/ta/man/jit/figs-explicit]])
A spider web is fragile and easily destroyed. Alternate translation: "He builds his house as fragile as a spider builds its web" or "He builds his house as fragile as a spider's web" (See: [[rc://en/ta/man/jit/figs-simile]])