Final Flashcards
The methods and materials used to protect and
conserve historic buildings.
Preservation Technology
Four key steps of preservation technology
- Identification
- Condition Assessment
- Evaluating Treatment Options
- Recommendation
Preservation Technology is a
multi-disciplinary approach
- Architects
- Engineers
- Archeologists
- Conservators
- Preservationists
- Contractors
- Tradesmen
- Historians
Four Approaches (4 R’s)
- Preservation
- Rehabilitation
(Adaptive
Reuse) - Restoration
- Reconstruction
The maintenance of a property without
significant alteration to its current condition
Preservation
The most flexible intervention strategy.
Generally, the changes are most radical
on the interior.
Rehabilitation (aka adaptive reuse)
Taking a place back to a particular
moment in time.
A careful decision is needed because this
approach does not allow for the natural
evolution of the building.
Should not be based on guesses (think:
Viollet-le-Duc), only evidence.
Restoration
Replicating the appearance of a specific
time in a contextual setting.
Most appropriate when a historic structure
needs to be physically in place at a larger
historic site to provide context for
interpretation.
Reconstruction
Applies careful scientific analysis to the
process of understanding the details of
specific problems and justifying
appropriate solutions.
Example: Evaluation of historic colors.
Conservation
- Interview current and former owners.
- Ask for old photographs, news clippings,
plans. - Library and historical society archives
- Old newspapers (Newspapers.com)
- Old city Directories
- Census Data (Ancestry.com)
- Deeds/Titles (Hamilton County Register of
Deeds) - Building permits
- Research publications (in or out of print)
Literature/Resource
Search
- Architectural changes/discontinuities
- Blocked-in doors and windows
- Breaks in moldings
- Ghost outlines of former additions
(exterior) - Ghost outlines of removed walls/rails
(interior) - Odd window sizes/infill
- Old door hinge/jamb locations
how to read a building
- Mental and written notes on key
elements. - Assess the structural condition.
- Modifications or additions?
- Sketch facades and floor plans.
- Measure overall footprint.
- Take photographs.
- Survey interior room conditions.
- Inventory structural and mechanical systems
the investigation process
identifying the physical remains of past human
activities (prehistory and history)
the role of archeology
The National Preservation Act of 1966 mandated
that no new construction project on public land
or involving public funds could proceed if it
damaged an unstudied/suspected archeological
site
cultural resource management
Focused on the “building envelope” – roofs,
windows and walls.
Priority #1 – keep the water OUT.
Priority #2 – balancing heat loss/gain to
prevent unwanted moisture and air infiltration.
Technology of Building
Materials
The roof is the first line of defense against
water and critical to maintaining structural
integrity.
Roofing materials change – the roofing
material is considered “sacrificial” because
they must be replaced periodically.
Inspect roofs from above and below.
Take note of any evidence that tells you what
the original roofing was and how it has
changed over time.
start at the roofs
Some slates are more durable than others, but a
properly laid top quality slate should last 80-100
years+.
Check for:
Broken slates
Missing slates
Slate flaking apart (delamination)
Nails letting go (fastener failure)
Slate particles collecting in valley flashing
inspecting slate
For maximum roof life, shingles and shakes
require proper air circulation underneath so they
can dry after rain. Therefore, they should be laid
on open sheathing. If you find that they are
improperly laid, you can help them dry by
providing adequate ventilation in the attic.
Check for:
Biological attack (moss or mold, insects, birds)
Cupping and warping
Deep cracks and splits
Wood has become unevenly thin from erosion
Inspecting: Wood
Shingles
Pay particular attention to shingles on the ridge,
hips, and at roof edges; they get the hardest
wear. Also watch for lumpiness that indicates a
new roof has been applied over old shingles; all
sorts of damage could be covered up.
Check for:
Mineral granules almost totally worn off
shingles
Mineral granules collecting in gutters and base
of downspouts
Edges of shingles look worn
Check for:
Nails popping up
Roof looks new but lumpy
Mold or moss forming on shingles
Holes in the roof from guy cables, TV antennas
etc.
Leading edge of roof damaged by ladders
Inspecting: Asphalt
Shingles
Check for:
Wet spots
Stains
Rotten materials
Efflorescence (salt residue)
Mold (fungus)
checking under roofs
Windows greatly contribute to a building’s
historical style and integrity.
Repair is preferred over replacement.
Replacements should match the old in design,
coloor, texture, and material.
Consider newer materials carefully.
Add storm windows for energy efficiency and
weather protection
The View on
WINDOWS
Maintenance addresses both the masonry
units as well as the mortar between them.
May be weight-bearing.
Repair before cleaning to prevent moisture
penetration.
Repoint eroded mortar joints.
Replace broken or damaged masonry.
Patch epoxies/cementitious compound
Check for:
Cracking
Spalling (peeling/crumbling)
Bowing (bulges horizontally)
Leaning
Mortar deterioration
exterior masonry windows
Most likely did not exist when the historic
building was first built.
Certain features can be “grandfathered in”, or
accepted as-is under certain conditions.
There may be “trade-off” options available.
The International Building Code has provisions
for old buildings – but often leaves
interpretation to the local inspectors.
construction codes
Typically, a building needs to provide two ways
of getting out from each level (egress).
This can be impacted by the use – and
“assembly” classification may require event
more.
Open stairs are typically not counted as an
official fire exit. These must be fire-rated with
doors and finishes that limit how quickly fire
can penetrate the space.
Sprinkler systems can help with options.
two ways out
Are preservationists anti-development?
no
(Master Plans) guide a
community’s land use decisions over a long-time
span.
Common elements include:
* Housing
* Transportation
* Environmental Features
* Public Facilities
* Economic Development
* But rarely historic preservation
comprehensive plans
Most effective ___________ Plans exist within
the context of a comprehensive plan. Common
elements include:
* Goals of preservation in the community
* Definitions of historic character
* Past and current preservation efforts
* Survey of historic resources/assets
* Legal basis for protection
* Incentives
* Educational programming
* Goals and policies
Preservation Plans
address the relationship
between building facades and the public realm,
the form and mass of buildings in relation to one
another, and the scale and types of streets and
blocks.
form-based codes