by
Adam Bond, Architectural Preservationist
Maintenance as an Ethos
The argument for maintenance as the fundamental ethic of historic preservation is not a counsel of perfection. It is an economic argument — about the actual costs and benefits of competing approaches to the management of existing building stock — that happens to be compellingly supported by the evidence, and that has been systematically suppressed by the structural incentives governing the construction industry, the lending system, and American consumer culture more broadly.
The deterioration of buildings follows a cost curve that is strongly nonlinear and consistently underappreciated. Small failures — a failed mortar joint, a cracked glazing compound, a split clapboard, a blocked gutter — are cheap to address in isolation and compound rapidly if ignored. A failed mortar joint that costs $200 to repoint becomes, if water infiltrates over two or three winters, a brick spalling problem that costs $3,000 to repair and cannot be fully reversed. That same spalling damage, if allowed to progress to the point of structural compromise, may trigger a replacement demand that costs $30,000 and destroys irreplaceable original material in the process. The ratio from first intervention to last is approximately 150 to 1.
This compounding dynamic is not unique to masonry. The sequence repeats across building systems: a failed roof flashing ($500 to repair) becomes a structural rafter decay problem ($8,000) if allowed to wet the framing through two or three seasons; failed glazing compound ($150) becomes a sash replacement ($800) becomes a full window replacement ($2,500) if the progression is not interrupted at the first stage. Building maintenance economics have a consistent shape: the cost of early intervention is low and the return is high; the cost of late intervention is high and the return is low; and the cost of non-intervention is catastrophic and frequently produces losses that cannot be recouped.
The problem is that these costs are not borne by the same parties in the same time frame. The property owner who defers maintenance captures the short-term savings and externalizes the compounding costs onto future owners, future tenants, or — when properties are abandoned — onto the public sector and the adjacent property owners whose values and conditions deteriorate in response. This is a classic externality problem, and like other externality problems, it is not corrected by individual rational choice alone — it requires institutional intervention.
The failure of American building maintenance culture is not simply a failure of individual discipline or attention. It is the predictable outcome of a set of structural incentives that systematically reward replacement over repair. The construction industry is organized for speed and standardization: a crew that installs drywall over existing plaster works faster and charges less per day than a plasterer who repairs the original; a crew that removes and replaces windows works faster and charges less per unit than a window restorer who re-glazes and weatherstrips; the economics of scale and standardization favor the new over the repaired at every point. The building trades that support maintenance — plastering, slating, lime pointing, glazing, copper work — have atrophied over sixty years of systematic underinvestment in training and certification, further raising the cost and scarcity of skilled maintenance labor relative to replacement work.
The lending system compounds this. The Federal Housing Administration’s historical preference for new construction over rehabilitation, the difficulty of obtaining financing for maintenance and repair (as opposed to construction), and the way that appraisal methods value improvements in terms of materials installed rather than materials preserved have all contributed to a financial environment in which maintenance is undervalued and replacement is overfinanced. A homeowner who replaces original windows with vinyl can typically finance the cost as a home improvement loan; the same homeowner who has the windows properly restored, weatherstripped, and fitted with storm sashes — an investment that will outlast the vinyl replacement by decades — cannot finance it as a capital improvement because it does not change the materials on the appraisal.
The result is a national building stock in which, according to the American Community Survey, approximately 2.4 million housing units have significant physical deficiencies, and in which the gap between deferred maintenance and available rehabilitation resources widens annually in post-industrial cities like Allentown. The buildings are not failing because they are old. They are failing because the systems through which they should be maintained have been systematically defunded and devalued.
Against the compounding costs of deferred maintenance, our manifesto asserts that Allentown’s pre-war building stock represents a durability dividend: materials and construction methods that, if maintained, have service lives measured in centuries rather than decades. This claim is not rhetorical, it is supported by the documented performance of comparable building stock in comparable contexts.
European cities provide the most striking evidence. Historic masonry buildings in Amsterdam, London, and Prague regularly demonstrate service lives exceeding 400 years. The structural brick walls of English Georgian terraces, built in the late 18th and early 19th centuries with lime mortar and locally fired brick, are in most cases in excellent structural condition where they have received competent maintenance. The materials have not degraded; the mortars have remained softer than the brick and have been repointed periodically as required; the roofs have been maintained; the windows have been repaired. The buildings work because they have been attended to — not because they have been protected from use or change, but because each generation of inhabitants has understood the maintenance obligation it inherited.
The specific durability of pre-war American brick construction has been studied by the National Park Service’s Technical Preservation Services, which documented that well-maintained masonry walls built with traditional lime mortar require repointing on average every 80 to 120 years — a maintenance cycle that is entirely manageable and that, when adhered to, produces essentially indefinite structural life. The framing members of pre-war buildings — predominantly old-growth timber of the properties described in our technical preservation guides — are, in sound condition, structurally superior to contemporary dimensional lumber and are more resistant to the insect and moisture damage that limits the life of modern stick-frame construction. These are not theoretical advantages. They are documented in the performance of buildings that have exceeded 100 years and remain structurally sound.
The comparison with post-1950 construction is sobering. Modern stick-frame residential construction, built with plantation-grown lumber, OSB sheathing, vinyl cladding, and asphalt roofing, has a design service life of approximately 50 years under ideal conditions and a demonstrated median service life considerably shorter in the climate and maintenance conditions typical of post-industrial American cities. The materials are specifically designed for replacement rather than repair: vinyl siding cannot be patched; OSB sheathing, once wet, cannot be consolidated; asphalt shingles, once granule-depleted, must be replaced wholesale. The maintenance option — the early, cheap intervention that prevents the compounding cost cascade — is largely unavailable for modern construction because the materials do not support it.
The presence of lead paint and asbestos in pre-war buildings is frequently cited as a reason for demolition rather than maintenance. This argument fails basic cost-benefit analysis. Lead and asbestos abatement is required whether a building is to be demolished, renovated, or maintained; the cost of safe management must be incurred in any case. The question is not whether to pay for abatement but what to do with the building after abatement has been paid for. Demolishing a building after abating its hazardous materials is paying twice — once to safely manage the materials and once to destroy the structure they were in — while generating the additional cost, ecological impact, and carbon emission of demolition debris disposal and replacement construction.
The EPA’s Renovation, Repair, and Painting (RRP) Rule provides a well-developed regulatory framework for managing lead paint during maintenance and renovation work in pre-1978 buildings. The framework is established, the certified contractors are available, and the costs — while real — are not of a magnitude that makes maintenance economically irrational relative to demolition. What the argument from hazardous materials achieves, in practice, is the addition of an emotional valence to a cost that would be incurred in any case — making the building seem dangerous and the decision to demolish seem responsible, when the actual consequence of the demolition is to convert contained risk into dispersed risk through the generation, transportation, and landfilling of contaminated debris.
Advisory Council on Historic Preservation. Measuring Economic Impacts of Historic Preservation. Washington: ACHP, 2018.
American Community Survey. Housing Characteristics Data, various years. US Census Bureau.
Environmental Protection Agency. Renovation, Repair, and Painting Rule (40 CFR Part 745). US EPA, 2008; updated 2011.
Rypkema, Donovan D. ‘Heritage Conservation and the Local Economy.’ Global Urban Development Magazine 4, no. 1 (2008).