Division 32 Exterior Improvements

Performance Specification Gap in Division 32 Exterior Improvements submittals

By Deviation Check Editorial Team. Last reviewed June 1, 2026.

Short answer

A measurable performance property in the submittal (rating, capacity, tolerance, efficiency) does not meet what the spec requires. Default grade in Division 32 Exterior Improvements: Blocker.

A measurable performance property in the submittal (rating, capacity, tolerance, efficiency) does not meet what the spec requires. This guide covers how it shows up specifically in Division 32 Exterior Improvements submittals.

What to look for in Division 32 Exterior Improvements

Key performance parameters in exterior improvement submittals:

  • HMA binder grade (PG XX-XX) - must match climate zone and traffic loading; submitting PG 58-28 where PG 64-22 is specified is a blocker in cold climates
  • Asphalt compaction target - % of maximum theoretical density (Marshall method: 96%, Superpave: 92-96% of Gmm); look for design vs field target
  • Asphalt mix design parameters - % passing each sieve, voids in mineral aggregate (VMA), air voids (target 3-5% in field), voids filled with asphalt (VFA)
  • Concrete paving compressive strength (f'c) - typically 4000 psi at 28 days for parking lots, 4500 psi for driveways, 5000 psi for heavy truck; verify submitted mix meets spec
  • Concrete air content - 5-7% for freeze-thaw exposure (ACI 301 Table 4.4.1); lower air content in freeze climates is a blocker
  • Concrete fiber type and dosage - polypropylene, steel, or synthetic macro fiber at specified lb/cy; fiber type affects crack control differently
  • Aggregate base gradation and compaction (% Proctor) - must match geotechnical recommendation
  • Irrigation precipitation rate (in/hr) per zone - must not exceed soil infiltration rate; mixed head types in same zone cause uneven coverage
  • Irrigation uniformity coefficient (DU, distribution uniformity) - minimum 0.70 for turf, 0.75 for potable water districts
  • Plant caliper size - must meet ANSI Z60.1 nursery stock grades; caliper measured 6" above grade for trees up to 4" caliper
  • Plant height and spread at time of delivery per ANSI Z60.1 grade requirements
  • B&B vs container specification - not interchangeable; B&B trees have established root balls, container stock has different acclimation requirements
  • Athletic surface Gmax impact attenuation - maximum 200g per ASTM F355; exceeding this is a safety blocker
  • Synthetic turf pile height and fiber weight (oz/sq yd) - affects playability, durability, and heat retention

How severe is it?

Default grade: Blocker. Always a Blocker when the gap touches life-safety or structural performance.

Deviation Check assigns a default per category and escalates or de-escalates based on the spec, always showing its reasoning. See the Division 32 severity rules.

What the PM should do

Treat this as a hold. Do not approve the submittal until the sub resolves it, either by providing the specified product and documentation or by routing an approved substitution or or-equal request. Return the relevant spec passage to the sub as a redline.

Back to the Division 32 Exterior Improvements hub, browse all divisions, or start a review.

Frequently asked questions

Which asphalt binder grade and compaction target numbers are checked during a Division 32 Exterior Improvements submittal review?

The HMA binder PG grade must match the climate zone and traffic loading in the spec - submitting PG 58-28 where PG 64-22 is required is a Blocker in cold climates. Compaction targets also require close checking: Marshall method design targets 96% of maximum theoretical density, while Superpave targets 92-96% of Gmm. Air voids in the field mix should fall in the 3-5% range.

Does concrete air content matter enough to block a Division 32 Exterior Improvements submittal?

Yes. ACI 301 Table 4.4.1 requires 5-7% air content for freeze-thaw exposure, and a mix design showing lower air content in a freeze climate is a Blocker. The spec compressive strength also controls: parking lots typically require f'c 4000 psi at 28 days, driveways 4500 psi, and heavy truck areas 5000 psi. A submitted mix below these thresholds cannot be approved as-is.

View this page as Markdown for LLMs and note-taking.