Do I need Historical Commission approval to re-roof?
It depends on what is changed and where it can be seen. Exterior work visible from a public street or park needs approval before it starts, while ordinary maintenance or work not visible from the street can go by certificate of non-applicability.
A full re-roof of a visible slope is exterior work that the Commission reviews. A change of covering, profile or color can alter the look of the street, and that is what the district is meant to protect. The Commission must approve such work before it begins, and the application describes the existing roof and the change.
Can a technician tell me whether my property is in a district?
No. The Springfield Historical Commission decides the district question, and a technician will not determine it for a property or for any reader.
District boundaries and their dates are matters of record that the Commission holds, and a reader should check them with the Commission rather than rely on a neighbor, a street name or a map that may be out of date. The districts that the city's materials list are Forest Park Heights, McKnight, Ridgewood and Quadrangle-Mattoon, each with its own creation date and its own character.
What is the difference between the two certificates?
A Certificate of Appropriateness covers conforming changes that the Commission reviews. A Certificate of Hardship is a separate route for cases that need supporting material, and it is decided on that material.
The Certificate of Appropriateness is the route for a change that conforms to the district's character, such as a visible roof change that matches the existing style. The application describes the work, and the Commission decides whether it conforms. The Certificate of Hardship is the route for a case where the owner needs the Commission to consider particular circumstances, and it asks for supporting material that the application sets out.
What moves the price of historic roof work here?
The number of slopes visible from the street, the amount of slate that needs repair, the access, the nails and flashing, and the time the approval process takes decide the price. No figure is printed on this site, and the price is explained and approved before work starts.
A roof with one visible slope and a few lost shingles is a smaller job than a full slate roof with several street-facing planes. Each visible slope may need its own documentation and its own approval route. Slate work takes more care than shingle work, because each slate is handled and set separately, and the nails have to be the right metal. Access on a steep slate roof can also need more equipment than an ordinary roof.
Does slate have to be replaced when some of it cracks?
Usually not. The National Park Service recommends repair rather than replacement whenever possible, and replacing a whole slope is generally reserved for roofs where a fifth or more of the slates have failed.
Slate that is cracked, broken or missing can often be repaired slate by slate, and the NPS guidance is to do that wherever it is possible. Roofing mastic and sealant are not a viable repair, because they harden, crack and let water in, so the repair has to replace the slate and its nails. Solid copper or stainless nails should be used, since plain steel and galvanized nails tend to rust out and are a common cause of slate loss in the older houses.