1. Reviewing the Construction Estimate
The listed components are:
Architectural Precast Panels — exterior cladding
Aluminum Storefront Windows — glazing system
Prefinished Metal Sill Flashing — weatherproofing at sill
Sealant — for joints between components
No line item appears for thermal insulation.
2. Identifying the Missing Element in the Axonometric Detail
Looking at the drawing:
The detail shows precast concrete panel cladding outside.
A storefront frame and glazing in the opening.
There is a hatched layer behind the precast in the stud cavity area — this represents continuous insulation.
The insulation is a required component for the wall to meet energy code R-value/U-factor requirements (per IECC or ASHRAE 90.1).
3. Why This is Critical
Insulation is essential for thermal performance, occupant comfort, and energy efficiency.
Omitting it from the estimate could cause:
Noncompliance with code.
Incomplete cost budgeting.
Change orders during construction.
In ARE 5.0 PDD, architects must check that all components of an assembly are represented in the cost estimate.
4. References
NCARB ARE 5.0 Handbook — PDD Content Area 3: Integration of Building Materials & Systems
Architectural Graphic Standards — Precast wall sections with insulation
Building Construction Illustrated (Ching) — Continuous insulation in wall assemblies
Energy Code References: IECC Table C402.1.3 for minimum continuous insulation requirements in exterior walls
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