1930_Brick_and_Blockstone_Streets_Detail.pdf

These are two technical specification drawings from the City of Pittsburgh's Department of Public Works and Bureau of Engineering, detailing street pavement construction standards for Blockstone Street and Vitrified Brick Street pavements, curbs, and center gutters.

The documents provide comprehensive engineering specifications for three types of street pavement construction, including detailed cross-sectional views and dimensional guidelines. The drawings specify construction requirements such as concrete base thickness (typically 6"), sand cushion depths, tar paper layering, expansion joint placement, and different block/brick types (Medina Sandstone, Lignite Limestone, Open Grain Granite for Blockstone; 4", 3½", and 3" depth brick types for Vitrified Brick). The specifications include precise ordinates for roadway widths ranging from 14' to 36', with detailed measurements for surface grades, gutter positioning, and slope gradients. Each drawing is approved by multiple engineering authorities, indicating formal review and standardization of the street construction methodology.