Historic restoration and conservation
The four federal treatments for historic buildings and who decides, replacing and substituting historic sheet metal, thermal movement and galvanic separation, a measured-record method with a limits check, and defects, inspection and verification.
4 lessons · about 50 min · 13 diagrams · 0 videos
Version 1.0.0
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0 of 4 complete
Lesson 1 · 11 min · 11 slides · 9 questions
Historic restoration and conservation: principles and terminology
The four treatments of the Secretary of the Interior's Standards (preservation, rehabilitation, restoration, reconstruction), how a treatment is chosen, who decides and who fabricates, the metals found on historic buildings, and the lead rule that covers old paint.
You will be able to: Name the four federal treatments for historic buildings, say which one a project is using and who decides, identify the historic sheet metals a fabricator meets, and state the lead-safety boundary for old coatings.
Not startedStart →Lesson 2 · 13 min · 11 slides · 12 questions
Historic restoration and conservation: materials, standards and design constraints
What the Standards require when historic metal is replaced, when a substitute is acceptable, galvanic separation, thermal movement by metal, copper weights, the limits of what AFS forms, and who reviews.
You will be able to: State the replacement standard for historic metal, choose between in-kind and substitute metal with the reviewer, separate dissimilar metals, work a thermal-movement figure from published values, and check a piece against what AFS can form.
Not startedStart →Lesson 3 · 13 min · 12 slides · 10 questions
Historic restoration and conservation: methods and worked application
The record that starts a conservation job, how a measured profile becomes a shop drawing with hems, a worked fit check against AFS's limits, sample and mock-up approval, the order of intervention, and the principles for installing replacement metal.
You will be able to: Follow a documented conservation sequence from the measured record to the approved shop drawing, check a measured profile against what AFS can form, plan a sample and mock-up for approval, and apply the order of intervention and installation principles.
Not startedStart →Lesson 4 · 13 min · 11 slides · 11 questions
Historic restoration and conservation: defects, verification and case study
How sheet metal deteriorates, flashing and drainage failures, temporary protection and harmful repairs, cleaning metals gently, inspection schedules, what a fabricator can verify, a worked thickness check, and a published repair case.
You will be able to: Diagnose how historic sheet metal fails, choose gentle corrective options, set an inspection schedule, verify a delivered part against the approved drawing, and document a repair from a published case.
Not startedStart →
Practical task
Produce a conservation job packet for one historic sheet-metal feature (a cornice, gutter, flashing or roof edge you can measure, or one you are given in a drawing): the treatment and who decides it, the metal and its condition, the measured profile with a limits check, a sample or mock-up plan, an inspection checklist and one defect with its cause.
Hand in
- A one-page decision rationale: which of the four treatments applies and why, which steps of the order of intervention (protect, stabilize, repair, limited replacement in kind) are used, and who decides and approves
- A marked-up sketch of the feature in section with the metal identified, each dissimilar-metal contact marked, and the separation material or fastener metal named
- A table of every number used (leg lengths, bend angles, hem type and return, thickness or weight, piece length, girth), each tagged with its source: your measurement, an AFS register or a published value
- A limits check of the profile against what AFS can form (girth with hem allowances, piece length, minimum flange, segment and hem return), with the arithmetic shown
- A completed shop inspection checklist with measured values, and one defect (real or given) with its cause, two gentle corrective options and what you would record
Rubric
| Criterion | Meets the standard when |
|---|---|
| Treatment and decision | The treatment is named from the Standards, the rationale cites condition, significance and use, and the packet says the project team chooses and the review body approves, not the fabricator. |
| Metal and separation | The metal is identified before any cleaning or repair is proposed, dissimilar metals are separated, and any substitute is flagged for the reviewer with the reason. |
| Arithmetic and sources | Girth, piece length and thickness checks are worked with units, every input is tagged with its source, and published values are not presented as AFS measurements. |
| Gentle and documented | Cleaning and repair options are the gentlest that work, patina is kept, and new work is identifiable and recorded for future researchers. |
| Defect diagnosis | The defect is traced to a cause (water, unlike metals, thermal movement or an earlier repair), the options are realistic, and the evidence list would let a reviewer check it. |