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Specific material planning profile

Drainage composite

A manufactured drainage layer that creates a water path only when continuity, protection, filtration, capacity, and a reliable outlet are resolved.

Material category
Waterproofing & drainage interfaces
Common exterior uses
Foundation walls, planters, retaining walls, podiums, terraces, green roofs, and below-grade structures.
What is scored
Specification attention for this named material type—not quality, beauty, durability, or a particular product.
Illustrative Drainage composite sample cropped from the waterproofing & drainage interfaces comparison board
Illustrative Drainage composite study—not a named product, quarry, mill, approved finish, test specimen, or installed project.

How the five-point scale works

Higher means more confirmation—not better material.

The Registry uses this scale to show how much project-specific specification attention a factor deserves for Drainage composite. It is an editorial planning framework, not a laboratory result or product certification. No factors are averaged into an overall grade.

Levels are assigned from two questions: how consequential an unresolved factor could be, and how specific the evidence must be before commitment. They do not predict service life or failure.

  1. 1Limited

    Confirm the standard submittal and installation requirements.

  2. 2Secondary

    Review the factor, but it is unlikely to control the decision by itself.

  3. 3Material

    Give the factor explicit project-specific specification attention.

  4. 4High

    Resolve the factor before approval because it can materially affect the result.

  5. 5Critical

    Require source-, product-, exposure-, or assembly-specific confirmation before commitment.

Specification-attention profile

What deserves attention for Drainage composite.

Every score below belongs to the named factor for Drainage composite. It does not describe the other examples in waterproofing & drainage interfaces.

  1. 5/ 5
    Critical attention

    Outlet and discharge

    Registry rationale

    A drainage layer is ineffective if water has no verified route to a suitable, maintainable discharge point.

  2. 5/ 5
    Critical attention

    Continuity

    Registry rationale

    Seams, corners, changes in plane, terminations, penetrations, and transitions must preserve the flow path.

  3. 4/ 5
    High attention

    Protection and capacity

    Registry rationale

    Backfill, loads, puncture, compression, flow rate, and installation sequence affect performance.

  4. 4/ 5
    High attention

    Filtration and clogging

    Registry rationale

    Soils, fines, roots, debris, and inaccessible outlets can reduce long-term drainage.

Before approval

Verify the actual selection.

  • Product capacity and suitability for the loading and orientation
  • Continuous route from collection to discharge
  • Filter, protection, backfill, and sequencing details
  • Outlet access, overflow, inspection, and maintenance plan

Owner questions

Ask the project team.

  1. Show the complete water path from entry to discharge.
  2. What prevents crushing, puncture, or clogging?
  3. How can outlets be inspected and serviced after completion?

Evidence and limits

Open supporting sources

These sources support the broader material-system principles. The five-point values are contractor-informed Registry editorial judgments under the published rubric; the sources do not assign those numbers. Current manufacturer literature, project specifications, source-specific test data, and local requirements must govern the actual selection.

Read the Registry methodology →
GSA · Building envelope guidanceSupports: Federal building-system coordination and performance context for enclosure, waterproofing, and drainage decisions.National Park Service · Moisture in buildingsSupports: Moisture-source diagnosis, drainage, drying, and the need to resolve water paths rather than conceal symptoms.

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