BACKGROUND: Hello, and thanks in advance for your assistance. I'm renting a Metal-Sided/Roofed home that sits on a concrete slab... and whenever wind-driven water comes against the house/foundation... the water seeps in. Also... there are HORDS of bugs that appear as though they walk right through the walls (house wide... every room)... including spiders, crickets, pill bugs, roaches, centipedes, etc. I've sprayed along all walls of the interior with a home insecticide... but I still have hundreds of dead bugs I have to vacuum up periodically. I put down an exterior caulk bead at the edge of where the metal siding meets the concrete slab... and that curtailed some of the water seeping into the home... but did nothing about the bug problem. This home is on my sister's property and sits in close proximity to her sheep herd... so I cannot use outside pesticides (although I have sprayed with dishwashing soap & water before... not seeming to make much a difference). I've ensured that the door footings are NOT letting through water/bugs... and there doesn't appear to be any holes in the exterior that are unsealed.
QUESTION: Is there anything I can do about the bug/water infiltration? It seems like perhaps some underlayment between the concrete slap and the structure was forgotten for this much infiltration to be happening. I've considered caulking the entire interior perimeter at the floor (painted concrete floor inside)... but am afraid that will just allow moisture/bugs to sit under the walls and eventually damage the structure. The slab has those slits they notch into it to prevent the slab from cracking... and the bugs are infrequently hiding in those slits. PLEASE HELP!