Rodent Removal in the M Streets

The M Streets are compact Tudor cottages from the 1920s, which makes the opening list short and the openings consequential.

The neighborhood sits between Greenville Avenue and Central Expressway, and takes its nickname from the run of street names beginning with M: Merrimac, Monticello, McCommas, Mercedes and the rest. The houses are mostly one story or a story and a half, with steep front gables, arched entries, small casement or steel windows, and original boxed soffit returns at the gable corners. Greenland Hills is a Dallas conservation district, which means exterior alterations are reviewed and that replacing a soffit or a vent with something modern is a decision rather than a default.

The build date puts them in pier-and-beam territory, since Dallas homes before roughly 1965 are mostly pier-and-beam with a crawl space, while almost everything after 1970 is slab. On a cottage this size the crawl space perimeter is short, which is good news, and the headroom is often low, which is less good. The other consequence of the small footprint is that the attic is a tight volume, so a rat moving in it is audible in every room.

Renovation history is the wildcard. Many of these cottages have had kitchens opened up, bathrooms added and HVAC retrofitted, and each of those left penetrations through the subfloor or the top plate that nobody closed afterward.

The alley is the part of an M Streets property most likely to be holding the population.

This grid was laid out with service alleys and detached garages at the back of narrow lots, and those garages are frequently the oldest and least maintained structure on the property. A single-skin garage with a gap under the door, an open gable end, no vent screens and forty years of stored material inside is both shelter and a feeding station, and it sits within a few yards of the house. Norway rats stay close to the ground and enter under garage doors, through broken weep holes and into crawl spaces, which describes an alley garage almost exactly.

The alley itself concentrates the pressure. Trash containers, brush piles, compost, fence lines and the continuous run of the alley give animals a corridor along the whole block, which means a property can be clean and still be on a route. Fences and garage roofs then act as the ladder to the house roofline, since UF/IFAS describes roof rats traveling along limbs, wires and fences.

So an inspection here that stops at the house has covered half the property. The garage gets a closure list of its own, and where the stored material inside is the harborage, that gets said plainly rather than worked around.

House first, garage in the same visit, with the sealing split either side of the trapping.

The inspection walks the front and rear gables from a ladder, enters the attic through what is usually a small hall or closet hatch, and reads the droppings along the top plate for species and freshness. It then goes underneath the cottage, where the perimeter is short and the headroom is low, and checks skirting, vent screens, the access door and the subfloor penetrations left by kitchen and bathroom work. Then the garage: door gap, gable ends, vent openings, roof junctions and whatever is stored inside.

Closures on a conservation district house are chosen to be invisible from the street. Gable louvers are screened from behind with quarter-inch galvanized hardware cloth so the original louver stays in view, soffit returns are refitted as carpentry and backed with mesh, and sheet metal goes where it will not be seen. The quarter inch is the rat-proofing standard UF/IFAS publishes, and it is what every closure on the list is measured against. Traps then hold the live runs for a week at minimum and the last openings are closed once two checks come up empty.

The full scope is described on rodent exclusion, with the underside on crawl space rodent control.