Pb pb dating

Sometimes mortar was applied between the courses to secure the tiles in a heavy wind.In the mid-19th century, tile roofs were often replaced by sheet-metal roofs, which were lighter and easier to install and maintain.

pb pb dating-1

The size and shape of the shingles as well as the detailing of the shingle roof differed according to regional craft practices.People within particular regions developed preferences for the local species of wood that most suited their purposes.In some cities such as New York and Boston, clay was popularly used as a precaution against such fires as those that engulfed London in 1666 and scorched Boston in 1679.The plain or flat rectangular tiles most commonly used from the 17th through the beginning of the 19th century measured about 10" by 6" by 1/2," and had two holes at one end for a nail or peg fastener.Most suitable for dating very recent sediments suspected of being less than 100 years old.

Some of the web versions of the Preservation Briefs differ somewhat from the printed versions.

Commonly in urban areas, wooden roofs were replaced with more fire resistant materials, but in rural areas this was not a major concern.

On many Victorian country houses, the practice of wood shingling survived the technological advances of metal roofing in the 19th century, and near the turn of the century enjoyed a full revival in its namesake, the Shingle Style.

Many illustrations are new and in color; Captions are simplified and some complex charts are omitted.

To order hard copies of the Briefs, see Printed Publications.

Because slate was available in different colors (red, green, purple, and blue-gray), it was an effective material for decorative patterns on many 19th century roofs (Gothic and Mansard styles).