Inspecting Historic New Orleans Homes

Inspecting historic homes in New Orleans has its challenges and rewards.

The home may be in a historic area and subject to restrictions or regulations on alterations or repairs. The Vieux Carré Commission is a good example of a historic district. This commission preserves, protects and maintains the architectural, historic character and zoning integrity of the French Quarter. It does this by regulating all repairs, alterations, and construction of any building element on the exterior whether visible from the street or not. Owners not in compliance are charged with violations of the infractions. A sample of the Vieux Carré Design Guidelines. 

Historic or older homes may not be up to current code or compliance since the building was built before these codes existed. We will use the stairs of an 1860’s Creole Townhouse  as an example. The stairs were typically enclosed and positioned between the rear service wing and the main house. The rise and run of these older stairs may not meet today’s standards for compliance but are still functional.  You definitely would not tear them down to build new ones. Below are some of the items as examples that differ in older homes.

Structure – Many historic homes in New Orleans were built with solid masonry walls unlike the brick veneers you find on newer homes. What this means is the solid brick wall is actually structural where the brick veneer is just a cladding. The brick veneer can be removed and the structure will still be standing, while a solid brick wall is removed the structure collapses.

Electrical – It’s not uncommon to find electrical wiring from different eras  in the home. At times I come across the old gas lines in the attic used for gas lamps that hung from ceilings, more on this in the plumbing section. Many times I’ll find older knob and tube wiring (pre-1940) alongside older grey cloth wiring (1940-1955), aluminum wiring (1960-1970) and even newer Romex. Sometimes the older wiring is active and may be connected to newer wiring.

Plumbing – As mentioned above, the older gas lines used for gas lamps are sometimes still in place but most have been abandoned or capped. Galvanized supply lines can still be found and in use. Cast iron waste lines in the crawl space can still be found.

While these are not the only items inspected during a home inspection, they offer examples of the things we find. Every now and then we come across something cool like a secret hiding place like the one pictured in this newel post. The home it was found in was a Creole Cottage and built around the late 1700’s to early 1800’s.

Hiding spot in newel post

History of Electrical Wiring

Wiring methods have changed over the years.  Improvements in electrical wiring over the years were not just in materials used but also in installation methods.  All of these improvements help to provide safe and reliable wiring in the home. The ages below are based on the historic homes and building trends in the New Orleans area.

Knob & Tube wiring in an attic.

1880 – 1940 – Knob & Tube wiring was the first type of electrical wiring in homes. This type of wiring consisted of two single wires run parallel within wall or ceiling cavities. The wires were run through joists and stud holes through porcelain tubes and supported along their length with porcelain knob insulators which were nailed down. Knob & Tube wiring was labor intensive and expensive to install and eventually replaced with Rag wire.

Ungrounded older grey cloth wiring

1940 – 1950 – Rag Wire or (old cloth sheathing) Issues with rag wire include the insulation deteriorating and becomes brittle with age, also the lack of a grounding conductor.

1960-65 – NM (non-metallic) A cable that incorporated the use of a bare ground wire run with a hot and neutral wire concealed in an outer sheath made of plastic vinyl. This update made installation easy to install and is still used today.

Aluminium wiring in panel

1965 – 1973 Aluminum wiring – Due to the sudden escalating price of copper, single-strand (solid conductor) aluminum wiring was sometimes substituted for copper branch circuit wiring. Over time aluminum branch circuit wiring will become defective faster than copper due to certain qualities of the metal.

Newer color coded Romex with older Romex

Today – Newer Romex – NM (non-metallic) is flexible, heat and fire resistant, easy to install, and relatively inexpensive. Each conductor is insulated and the entire bundle is insulated in a color coded PVC jacket. Color coding is based on wire size.
For example:   15 amp circuit uses a 14 gauge wire, typically white PVC jacket
20 amp circuit uses a 12 gauge wire, typically yellow PVC jacket