Quick Answer
Building water intrusion is one of the primary technical disciplines behind an envelope that lasts. Ace designs and diagnoses across the Western U.S. — stamped drawings on new construction, forensic reports on remediation — with FGIA/AAMA accreditation and a one-week turnaround on every field deliverable.
Key Takeaways
- Building water intrusion is behind a substantial share of California construction-defect claims — water intrusion appears in roughly seven of ten cases.
- Ace’s approach covers water leak investigation, water intrusion diagnosis, envelope leak forensics, and water intrusion litigation — diagnosis first, design or remediation second.
- Design-phase decisions on building water intrusion cost about one-tenth of construction-phase fixes and one-hundredth of post-occupancy repairs.
- Documentation is code-defensible, FGIA/AAMA-accredited where testing is involved, and stamped where design is involved.
- Ace works across commercial, industrial, multifamily, mixed-use, and institutional projects in the $2M–$100M range from four offices across the Western U.S. (Concord and Newport Beach and San Diego, California, and Nampa, Idaho).
01 — OverviewWhat Water Intrusion Actually Covers
Building water intrusion is one of the primary technical disciplines behind an envelope that lasts. Water intrusion appears in roughly seven of ten California construction-defect claims, and building water intrusion is one of the specific mechanisms that produces that pattern. Ace covers this discipline as part of its broader envelope expertise — with diagnosis, design, and remediation delivered by the same senior team.
Why this expertise area matters
Envelope failures are almost never caused by a single defect. They are caused by an interaction between assemblies that were designed by separate consultants, detailed at different scales, and installed by different trades. Water Intrusion sits at one of those interactions — and understanding it is what lets Ace design a set that installs to a defensible standard.
How Ace approaches this discipline
Ace’s practice on building water intrusion runs the full arc: field diagnosis on existing buildings, stamped design on new construction, and code-defensible documentation on both. Every engagement produces a signed deliverable, turned around within a week of the site or lab visit.
Explore the Complete Guide
Cluster + siblingsThe pages below sit alongside this guide across Ace’s practice.
Cornerstone & Related
Condition Assessment
How Ace delivers building envelope condition assessment across commercial, industrial, multifamily, mixed-use, and institutional p…
Read more → Project TypesForensic Investigation
How Ace approaches envelope forensic investigation — with the same discipline whether the project is $2M or $100M….
Read more →More From Ace
Services
02Water Leak Investigation
Water leak investigation is one of the specific technical elements inside building water intrusion. It comes up whenever an envelope investigation, design, or remediation touches this discipline — and it is one of the specific bodies of knowledge Ace’s senior team is calibrated to.
The mechanism is straightforward at the top level but rich in the details: water leak investigation interacts with adjacent assemblies (waterproofing, air-barrier, thermal, structural) in ways that determine whether the envelope performs or fails. Ace approaches it with diagnosis first (what is the actual condition), design second (what is the corrected condition), and documentation third (what does the client have that survives review).
Where water leak investigation typically shows up
Water leak investigation tends to surface at the design-detail stage on new construction, at the diagnostic stage on remediation, and at the deposition stage on litigation. Ace’s practice covers all three, from the same team.
03The Problem, the Solution, and the Result
Envelope failures on this kind of work share a pattern. The problem is almost always under-drawn detail or under-scope-appropriate turnaround diagnosis at the design stage, and the resolution — after the failure appears — is disproportionately expensive. Ace’s building water intrusion is built to interrupt that pattern one stage earlier, where correction is still cost-effective.
Under-drawn, under-tested, under-owned
An envelope detail is drawn at half a sheet, tested against a proxy specification, and priced by three subs with three different assumptions. Whichever assumption wins the bid is the one that gets built.
Stamped, tested, accountable
Ace’s building water intrusion resolves the detail to installation-scale specificity, tests against the actual assembly on the actual project, and takes accountability under a single signed deliverable.
Cleaner bids, cleaner installs, fewer claims
Bid variance collapses. Field RFIs drop. The envelope conditions that would have produced a warranty claim in year three are resolved in year zero.
04Water Intrusion Diagnosis
Water intrusion diagnosis is one of the specific technical elements inside building water intrusion. It comes up whenever an envelope investigation, design, or remediation touches this discipline — and it is one of the specific bodies of knowledge Ace’s senior team is calibrated to.
The mechanism is straightforward at the top level but rich in the details: water intrusion diagnosis interacts with adjacent assemblies (waterproofing, air-barrier, thermal, structural) in ways that determine whether the envelope performs or fails. Ace approaches it with diagnosis first (what is the actual condition), design second (what is the corrected condition), and documentation third (what does the client have that survives review).
Where water intrusion diagnosis typically shows up
Water intrusion diagnosis tends to surface at the design-detail stage on new construction, at the diagnostic stage on remediation, and at the deposition stage on litigation. Ace’s practice covers all three, from the same team.
05How Ace Diagnoses and Documents This Discipline
Water Intrusion is not a black box. Ace runs a repeatable three-stage process with defined deliverables at each stage. What follows is the standard cadence.
Field or Document Diagnosis
Ace’s engagement on building water intrusion starts with getting to the actual condition — either through field investigation (existing buildings) or through document review (new construction). The output of this stage is a written diagnosis, not an opinion.
Design or Remediation
Given the diagnosis, Ace produces the corrected condition: a design set or a remediation scope. Both are stamped or signed under Ace’s license.
Verification & Documentation
Ace verifies that the design or remediation was executed as documented — through construction administration, field observation, or accredited testing — and produces the closeout record.
06Envelope Leak Forensics
Envelope leak forensics is one of the specific technical elements inside building water intrusion. It comes up whenever an envelope investigation, design, or remediation touches this discipline — and it is one of the specific bodies of knowledge Ace’s senior team is calibrated to.
The mechanism is straightforward at the top level but rich in the details: envelope leak forensics interacts with adjacent assemblies (waterproofing, air-barrier, thermal, structural) in ways that determine whether the envelope performs or fails. Ace approaches it with diagnosis first (what is the actual condition), design second (what is the corrected condition), and documentation third (what does the client have that survives review).
Where envelope leak forensics typically shows up
Envelope leak forensics tends to surface at the design-detail stage on new construction, at the diagnostic stage on remediation, and at the deposition stage on litigation. Ace’s practice covers all three, from the same team.
| Criterion | Ace | Typical alternative |
|---|---|---|
| Deliverable format | Stamped or signed | Memo or markup |
| Turnaround | One week from site visit | Variable |
| Accountability | Ace, one senior team | Handed off across teams |
| Fee model | Fixed by scope or design phase | Open hourly |
07Water Intrusion Litigation
Water intrusion litigation is one of the specific technical elements inside building water intrusion. It comes up whenever an envelope investigation, design, or remediation touches this discipline — and it is one of the specific bodies of knowledge Ace’s senior team is calibrated to.
The mechanism is straightforward at the top level but rich in the details: water intrusion litigation interacts with adjacent assemblies (waterproofing, air-barrier, thermal, structural) in ways that determine whether the envelope performs or fails. Ace approaches it with diagnosis first (what is the actual condition), design second (what is the corrected condition), and documentation third (what does the client have that survives review).
Where water intrusion litigation typically shows up
Water intrusion litigation tends to surface at the design-detail stage on new construction, at the diagnostic stage on remediation, and at the deposition stage on litigation. Ace’s practice covers all three, from the same team.
08Where This Expertise Gets Applied
Ace’s building water intrusion is engaged by four buyer types, each with a different reason to call. The framing below is the shortest useful map of how the same practice lands with each role.
Developers & owner-builders
Developers hire Ace to reduce defect-liability exposure and to tighten envelope bid variance. See developers & owner-builders.
Architects & design teams
Architects engage Ace as a design peer — a firm that stamps the envelope scope the architect chooses to hand off. See architects & design teams.
General contractors & construction managers
GCs and CMs engage Ace to keep the schedule intact when an envelope detail has to be resolved in the field. See general contractors.
Institutional owners & capital-program teams
Hospitals, universities, K–12 districts, and government agencies engage Ace for envelope work across recurring capital programs. See higher education, healthcare, and K-12 schools.
The Bottom Line
Building water intrusion is the discipline of getting envelope work right at the earliest and cheapest stage of a project. Ace is one of a small number of Western U.S. firms that acts as Architect of Record for the waterproofing scope on new construction and remediation — which is the single move that most reduces envelope defect exposure at that stage.
Frequently Asked Questions
What are building water intrusion?
Building water intrusion is one of the primary technical disciplines behind an envelope that lasts. Ace designs and diagnoses across the Western U.S. — stamped drawings on new construction, forensic reports on remediation — with FGIA/AAMA accreditation and a one-week turnaround on every field deliverable.
How does Ace approach water leak investigation?
Ace’s approach to water leak investigation is documented in a scope memo at engagement start, delivered by one senior team, and closed out with a signed deliverable. Fees are typically fixed by design phase, not hourly. Every field or lab report turns around within a week of the site visit.
What is included in Ace’s water intrusion diagnosis?
A complete water intrusion diagnosis engagement at Ace covers the scope-of-work definition, the deliverable format (stamped drawings, signed reports, or accredited test documentation), the delivery schedule, and the closeout package. Sub-scopes vary by project; the engagement structure does not.
When should we bring Ace in for envelope leak forensics?
The earliest engagement produces the largest cost savings — ideally at basis-of-design on new construction, or immediately on discovery of a symptom on existing buildings. That said, Ace is regularly brought in at plan check, during construction, or after occupancy to resolve a specific problem.
How much does building water intrusion cost?
Fees for building water intrusion are typically fixed by scope or design phase rather than hourly, which lets the client budget the envelope engagement against the rest of the project. Fees scale with project size and complexity. As a general rule, the engagement fee is a small fraction of the cost of the first field problem it prevents.
How long does building water intrusion take?
Ace’s typical engagement runs about ten to twelve weeks on new construction and compresses to about six weeks on remediation. Every stage closes with a signed deliverable, so a client can hold work at any gate without carrying open scope.
Who signs the building water intrusion deliverables?
Ace’s deliverables are stamped under Ace’s design professional license (where design is involved) or attested to under Ace’s FGIA/AAMA accreditation (where field or lab testing is involved). Deliverables are not marked up under someone else’s license.
Does Ace serve projects in Water Intrusion?
Yes — Ace serves this state directly from four offices across the Western U.S. (Concord and Newport Beach and San Diego, California, and Nampa, Idaho). Ace’s Western-U.S. practice covers California primarily, with selective coverage across Arizona, Nevada, Idaho, Oregon, Utah, and Washington.
How does Ace handle water intrusion litigation?
Ace addresses water intrusion litigation as part of its structured building water intrusion engagement — scope-appropriate turnaround at engagement start, delivered by the same senior team, closed out with a signed deliverable. water intrusion litigation is not treated as an add-on, and it is not handed to a specialist third party.
What if a field condition can’t be built as designed?
Ace resolves field-condition issues within a week of the site observation. Because Ace’s design of record is stamped under Ace’s own license (where Ace is Architect of Record), Ace has the authority to issue a stamped clarification or revision directly — not routed through the project architect for a change instrument.
How We Built This Page
This guide was written by John Harris, President of Ace Building Envelope Design, and reviewed for technical accuracy by Conor Meyers, CEO. It draws on Ace’s active portfolio across the Western U.S., on published construction-defect liability research, on FGIA/AAMA field-testing standards, and on the National Institute of Building Sciences’ Whole Building Design Guide.
Last reviewed July 2026.
References
- Fenestration & Glazing Industry Alliance (FGIA). Field-test methods, accreditation program documentation, and industry standards. https://fgiaonline.org/
- National Institute of Building Sciences — Whole Building Design Guide. Water and vapor migration guidance for building envelopes. https://www.wbdg.org/design-objectives/functional-operational/water-vapor-migration
- Terner Center for Housing Innovation, UC Berkeley. Construction defect liability research. https://ternercenter.berkeley.edu/research-and-policy/construction-defect-liability-california/