Restoration Glossary

Term Definition

A house type or form brought over by colonists from England, the I-House was common in English communities. Defined by its tall, thin profile, common features include: two-story construction; side gable roof orientation; a rectangular, one-room-deep floor plan; and a symmetrical design with a central entry and three to five bays.

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Ice Dam

Ice dams form when snow lying against the roof is melted by attic warmth from below rather than from the sun’s warmth from above. If water on the roof cannot drip off the eave because the gutter is blocked by leaves, ice, or snow, the water may re-freeze and push water up under the roof shingles and into the sheathing, soffit, and wall cavity. When ice dams form, water is forced inside and can flow down the interior walls, damaging decorative finishes. Plastic sheeting placed under the attic eaves may catch water and minimize interior damage. Ice dams often form on the north slope of a roof since this slope receives limited sunlight during the winter. Clearing an ice dam is difficult and dangerous as it requires accessing the ice dam and chipping a hole through the overlying blockage to let the water out.

There are several ways to prevent or lessen the occurrence of ice dams. Using a special long rake, snow can be raked off the eaves after each major snowfall to keep gutters free of overlying ice and snow. Alternatively, eave flashing, such as a course of roll roofing or rubber membrane ice shield installed under the roofing shingles, can prevent water infiltrating the roof sheathing. Finally, unheated portions of the attic can be air-sealed and then vented to keep household heat from warming the underside of the roof; opening attic windows or adding soffit vents, or vents in the gable ends of the house may be needed to cool the attic sufficiently.

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Ionic Order

The second-oldest (mid-6th – 5th century B.C.E.) of the three basic orders of classical Greek architecture (the others being the Doric and the Corinthian orders). In ancient Greece, the Ionic order was the feminine order, and the most appropriate for temples constructed in homage to goddesses. In ancient Rome, the Ionic order was much more prominently utilized than the Doric order. An Ionic column is tall and slender, with a fluted shaft of 24 flutes, a capital with prominent volute scrolls, and an elegantly molded base.

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The Italianate style is considered the most common architectural style of Midwestern downtown commercial centers. It is most easily identified by projecting cornices supported by decorative brackets (often found in pairs), tall narrow windows capped by decorative stone or metal moldings, and elaborate cast-iron storefronts.
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