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locations and necessary sections and dimensionsto define the size and shape of the architectural precastconcrete units, indicate the location and size of reveals,bullnoses, and joints (both functional and aesthetic),and illustrate details between panels and adjacent materials.When more than one type of panel material orfinish is used, indicate the extent and location of eachtype on the drawings. The location and details of appliedand embedded items should be shown on thedrawings. Plans should clearly differentiate betweenarchitectural and structural precast concrete if bothare used on the same project. The details of cornersof the structure and interfacing with other materialsshould be illustrated. The aesthetic requirements anddesign loads should be identified, and load supportpoints and space allowed for connections should beindicated. The Engineer of Record needs to be awareof the magnitude and direction of all anticipated loadsto be transferred from the architectural precast concretecomponents to the building structural framingand their points of application. These loads should beaddressed in the bid documents. It is especially criticalthat the Engineer of Record make provisions for stiffenersand bracing required to transfer the architectural

precast concrete loads to the structural frame.There should be no gaps between the specificationsand drawings nor should they overlap; the specificationsand drawings should be complementary.6.2.2 SpecificationsThe type and quality of the materials incorporatedinto the units, the design compressive strength of theconcrete, the finishes, and the tolerances for fabricationand erection should be described. In the eventa performance specification is used appropriate datashould be included for the precaster to assess thescope and quality of the precast concrete units to befabricated.

Specifiers should consider permitting variations in productionmethods, structural design, materials, connectionand erection techniques to accommodate varyingplant practices. Specifying the results desired withoutspecifically defining the manufacturing procedures willensure the best competitive bidding. Required submittalsshould also include range-bracketing samples forcolor and texture.The availability, quantity, performance, cost and productionconsiderations of each ingredient and finish ofarchitectural precast concrete can have a large impacton a projects schedule and budget. Therefore, theyshould be determined and specified for each specific

project before the project specifications are released.The time and expense required to develop samples andselect concretee colors and textures can be considerableand should not be underestimated by the design team.The specification section should include requirementsfor connection components embedded in the precastconcrete, related loose connection hardware, and anyspecial devices for lifting or erection, if required. Items tobe specified in other sections include building frame supportprovisions required to support units, including portions

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of connectors attached to the structure, joint sealingand final cleaning, and protection of the architecturalprecast concrete.6.2.3 CoordinationThe responsibility for supply of precast concrete supportitems to be placed on or in the structure in orderto receive the architectural precast concrete units dependson the type of structure and varies with localpractice. Clearly specify responsibility for supply andinstallation of pre-erection hardware. If not suppliedby the precast concrete fabricator, list supplier and installationrequirements in related trade sections.The type and quantity of hardware items required