Porches. Fig. 127 illustrates the manner of framing the floor of a porch. Such framework should be given a pitch downward away from the house of about 1" in 10' that the water may be drained.
Fig. 128 illustrates the manner of placing water table and flooring, etc. Water table is first placed, the corners being mitered and the whole furred out from the frame about a quarter of an inch to allow any dampness to escape. Porch floors should have their joints painted with lead just before being laid.
Fig. 127. Detail of Porch Framing.
Posts and balusters are usually placed after the porch roof has been placed, the upper frame being temporarily supported by studs.
In Fig. 127 is also shown the manner of framing the bearing joists, ceiling joists and rafters for a hip roof. The various cuts are obtained in the same manner as are similar cuts on the main roof. Porch roofs are seldom given as much pitch as the main roof. They do not need as much and must, usually, be kept below the window sill line of the second story.
Fig. 128. Detail of Porch Finish.
Fig. 128 also illustrates a common type of trim for porch cornice. Where supporting plates are long, a flitch plate girder is formed of them by the insertion between them of a stiff plate of structural steel of suitable length and width.