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C.

Thermal Performance:  Provide calculations complying with ASHRAE/IES Standard 90.1 and confirming the effective thermal resistance for the concrete sandwich wall system.  

i.

Sandwich panel system is designed and configured to eliminate “thermal bridging” resulting from penetrations of insulation layer by highly conductive or non-insulating materials.

ii.

Sandwich wall connecting system shall not reduce the thermal resistance of the wall assembly by more than 2% when R-value is calculated using the series parallel path method of calculation according to ASHRAE Fundamentals Handbook.

D.

Moisture Performance:  Provide calculations complying with the ASHRAE Handbook of Fundamentals – Theory of Water Vapor Migration and confirming the requirements for effective moisture condensation prevention.  

E.

Thermal bowing and crack mitigation: Provide calculations and details that indicate how panel wall bowing and concrete cracking will be mitigated if the concrete sandwich wall panels are to include full-thickness concrete sections or metallic connectors between the concrete wythes (surfaces).

F.

Shop (Erection) Drawings:  Detail fabrication and installation of architectural precast concrete units.  Indicate member locations, plans, elevations, dimensions, shapes and cross sections.  Indicate aesthetic intent including joints, reveals, and extent and location of each surface finish.  Indicate details at building corners.

1.

Indicate separate face and backup mix locations, and thicknesses.

2.

Indicate welded connections by AWS standard symbols.  Detail loose and cast-in hardware, and connections.

3.

Indicate locations, tolerances and details of anchorage devices to be embedded in or attached to structure or other construction.

4.

Indicate locations, extent and treatment of dry joints if two-stage casting is proposed.

5.

Indicate plans, and/or elevations showing unit location, and sequence of erection for special conditions.

6.

Indicate location of each architectural precast concrete unit by same identification mark placed on panel.

7.

Indicate relationship of architectural precast concrete units to adjacent materials.

8.

Indicate locations and details of brick units and joint treatment.

9.

Indicate locations and details of stone facings, stone anchors, and joint widths.

10.

Design Modifications:

a.If design modifications are necessary to meet the performance requirements and field conditions, submit design calculations and drawings.  Do not adversely affect the appearance, durability or strength of units when modifying details or materials and maintain the general design concept.

Retain subparagraph below if “Performance Requirements” Article is retained.  Delete or modify if Architect assumes or is required by law to assume design responsibility.

11.

Comprehensive engineering design [signed and sealed] [certified] by the qualified professional engineer responsible for its preparation registered in the state in which the project is located.  

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