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analysis can determine the historically correct colors
with samples taken from an undisturbed (i.e., unstrapped
and unweathered) wall section.  When preparing to paint,
clean the wall first, then scrape and sand the old
surface; but do not strip it unless necessary.  Do not use
water on bare wood.  Prepare the surface carefully: putty,
spackle, repair splits, replace bad sections, sand and
feather the edges of built-up paint.  It is best to use
the same type of paint when repainting.
Insulating Walls.  Insulating an existing frame wall is
o
often difficult.  The cost and destruction of historic
fabric is not generally justified unless the building is
being completely resided or replastered.  The amount of
heat lost through walls is relatively small compared to
that lost through windows, doors, and roofs.  Concentrate
insulation efforts in these more cost-effective areas. Do
seal wall and foundation cracks.  Do not use urethane foam
insulation since, besides posing a health hazard, it
retains moisture in the walls and cannot be removed
without damaging the original materials.
Controlling Vapor Transmittal.  When vapor barriers are
o
used, they should be placed toward the heated side of the
wall (toward the inside in cool climates, toward the
outside in hot humid climates).  Wood walls need to
breathe.  Do not over-insulate.
Enclosing Porches.  Porch enclosures should not detract
o
from the historic design of a building.  Maintain the
overall form of the porch, as well as cornices, columns,
and trim.  Exterior vestibules can be added to increase
energy efficiency and convenience if they are carefully
designed.  The best place to put them is generally within
an open porch.
4.10 WINDOWS.  Whenever feasible, historic windows should be
repaired rather than replaced.  If they must be replaced, the new
windows should be replicas of the old ones.  Windows are an
important design feature of most buildings, including warehouses
and factories.  They reflect the historic period, architectural
style, regional characteristics, and technological development of
the building.  When they are changed, the historic appearance of
the building is also changed.
In evaluating significance of windows, they should be
considered historically or architecturally significant if they:
o Are original;
o Reflect the original design of the building:
o Reflect the historic period or regional styles and
building practices when the building was constructed;
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