Timber upper-floors can be divided into two types—single and double. Single floors are those that have their joists spanning from one wall to the other without any intermediate support; double floors are those that have their joists supported (by beams) between the supports at their ends. In this chapter we shall only deal with single upper-floors made from timber. Although fireplaces are fast disappearing in the upper floors of domestic buildings, a fireplace is included in these drawings to illustrate the trimming and hearth preparation required from the carpenter, should it be required.
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