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2.

Division 3 Section “Glass-Fiber-Reinforced Concrete.”

3.

Division 4 Section “Dimension Stone Cladding” for furnishing stone facings and anchorages.

4.

Division 4 Section “Cast Stone” for wet or dry cast stone facings, trim, and accessories.

5.

Division 4 Section “Unit Masonry Assemblies” for full-thickness brick facing, mortar, and anchorages.

6.

Division 5 Section “Structural Steel” for connection attachment to structural-steel framing.

7.

Division 7 Section “Water Repellents” for water-repellent finish treatments.

8.

Division 7 Section “Sheet Metal Flashing and Trim” for flashing receivers and reglets.

9.

Division 7 Section “Joint Sealants” for elastomeric joint sealants and sealant backings.

10.

Division 8 Section “Aluminum Windows” for windows set into architectural precast concrete    

        units and tiebacks for window washing equipment.

1.3  DEFINITIONS

Retain paragraph below if a design reference sample has been pre-approved and is available for review.

A.

Design Reference Sample:  Sample of approved architectural precast concrete color, finish and texture, pre-approved by Architect.

1.4  PERFORMANCE REQUIREMENTS

Retain this Article if delegating design responsibility for architectural precast concrete units to fabricator.  AIA Document A201 requires Owner or Architect to specify performance and design criteria.

A.

Structural Performance:  Provide architectural precast concrete units and connections capable of withstanding design loads within limits and under conditions indicated.

Retain paragraph above if placing design loads on Drawings; retain paragraph and applicable subparagraphs below if including design loads here.  Revise requirements below to suit Project, and add other performance and design criteria if applicable.

ASHRAE/IES Standard 90.1 requires that thermal performance be established using the isothermal planes analysis method.  This standard is now incorporated by reference in model energy code.  Calculations must include the effects of any thermal bridges that penetrate the insulation, including concrete or metal connections.  Thermal bridges significantly compromise the thermal performance of insulated concrete sandwich wall panels.  Envelope performance must account for varying insulation locations when not on the same side of an envelope construction.  Standard 90.1 requires that in addition to analysis of penetrations through insulation, analysis of thermal bridges created by the construction proper is considered.  For example, walls may be designed with insulation at the top of the wall. Others are designed with insulation located outside the wall for the first twelve feet and inside the wall for the remaining height up to the roof system.  These designs create a thermal bridge (the wall) at the point where the two systems cross or the top insulation ends without physical intersection with an adjacent insulation system.  The specifier should identify the acceptable R-value for the panels.  

B.

Thermal Performance:  The insulated concrete sandwich panels must be constructed to maintain the effective acceptable material R- <Insert R-value required> of the panels with less than

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