Plate 33 illustrates the draftsman's method of presenting the structural plan in the main floor of the church.

The Sunday School wing has floors of concrete slabs while the auditorium floor is a combination system made up of a large number of concrete joist between which are fillers of hollow structural tile block, the latter system being used for the longer spans.

In drawing a plan for the concrete slab floor, notice that the bearing walls below are shown by dotted lines and the outlines of the slabs are solid lines. Then the slab thickness and the size, section and spacing of the steel reinforcing rods are noted on each slab. Where the slab is supported by a beam, the beam is shown dotted on the plan and its number is noted B-8, B-9, etc.

The figures in the small rectangles give the elevation of the slab top above the bench mark on the curb at the street intersection. These elevations are noted at all points of the plan, for the top of each slab must come exactly to the proper level.

Plan Of Concrete And Tile Floor Systems 37

PLATE 33.

Note - Holes For Heat Openings In Auditorium Floor Not Shown Same Are To Be Located As Directed Iacing Rods In All Plain Slabs To Be 3/8" φ-24"O.C. Laid At Right Angles To Main Rods.

The plan of the combination floor system shows the supporting walls and beams dotted as before and each concrete joist of the floor indicated by solid lines.

Notice that the center part of the main floor is made up of 71 units as shown in the detailed section above the plan on this plate, each unit having a tile filler 12 inches wide and a concrete joist 4 inches wide. The note (6" Tile - 2" Conc.) means tile 6 inches in depth with 2 inches of concrete on top of it as shown in the detail marked J-A, J-B.

On this plate is given also a typical schedule or list of the size of the concrete girders, beams and joist, and a description of the steel reinforcement in each.

PLATE 34.

Plan Of Concrete And Tile Floor Systems 38

[This elevation is taken From Position D As Shown on The First floor plan And Looking in the. Direction indicated by The Arrow. The side of the Sunday school wing is not Included in this Drawing since It runs at an angle of 120° With The Above Wall and so Would be distorted if viewed from This Direction!]

PLATE 35.

Plan Of Concrete And Tile Floor Systems 39

[Sections Similar To The Above Are Made To Give A Comprehsive View Of The Interior. They Show Each Feature In Proper. Relation To The Others And To The Whole, But Describe Nothing In Detail Thus The Given Section Shows The Disposition Or Trusses & Other Roof Members & The Location Of Floors Windows. Plaster Arches. Vaults Etc Properly Placed In The Scheme Wherever Any Part Has Been Cut Directly Thru As The Roof Truss Members, Balcony Floors, Etc. A Slightly Heavier Outline Around That Part Will Add To The Legibility Of The Drawing No Dimensions Need Be Given On Such A Section Because Each Feature Is Described In Detail By Drawings Made At A Larger. Scale .]

PLATE 36.

Plan Of Concrete And Tile Floor Systems 40

Plate 34 will give an idea as to the presentation of the elevation of a building whose walls are built of roughly-faced stone laid up in what is known as rock face broken ashlar. On an elevation showing this kind of masonry, only enough of the stone joints are drawn to show the approximate size of the stones and about how they are to be laid up. Where cut stone is used as around the windows and doors, each stone should be drawn.

Every opening has a number, and where the feature in the opening is rather complicated, as the main door 65 or the tracery in the tower, it may be omitted from the small scale elevation entirely but shown on the larger scale details.

A note on the plate explains how the elevations there shown are taken.

The two ends of the Sunday School wing and the bay over the entrance door show the manner of indicating stucco walls with imitation half-timber construction.

Notice on these drawings that the elevations of the bottom of the foundation walls are noted as are also those of the finished grade and the floor levels. These elevations as well as those on the contour map are measured from the bench mark on the curb stone.

On Plate 36 is a typical scale detail of the interior of the church auditorium. Here the draftsman has taken three drawings and so combined them as to save space and, at the same time, show the different views of each feature in close proximity.

The center part of the drawing gives a transverse section through the auditorium taken near and looking toward the south entrance doors. The right half of this shows in detail the plaster and wood finish on the roof trusses, the ornamental balcony rail and plaster balcony ornament. It also gives in more detail the wall and floor construction and the roof of the side aisles. The structural or working part of the roof truss is shown to the left of the center line as is also the structural detail of the roof itself, thus showing the relation between structure and finish.

At the extreme left of the sheet is a section through the center of the balcony over the narthex (check with Plate 32) and through a part of the south or front wall of the church. This drawing is made to show in detail the construction of the balcony and the elevation of the west wall in the narthex. It also details the arches at the side aisles.