TRADE-MARK … A Barrett Specification Roof con-sists of alternating layers of Specifica-tion Felt and .Specification Pitch, with atop surface of either gravel, slag or tile.Built-up roofs of tarred felt andcoal-tar pitch laid along the lines of the Barrett Specification covermany of the first-class buildings of…
Building and engineering specifications · Construction companies · Building material manufacturers
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
