There’s a question we get from prospective clients that we’ve never heard another builder answer well: What’s the detail you build to that most builders skip?

For us, the answer isn’t abstract. We know exactly which details get skipped because we’ve spent years arriving at finished homes after those details failed — pulling open walls to find moisture that’s been migrating for three years, diagnosing ice dam damage at an eave that was installed to minimum code, tracing water intrusion back to a pan flashing that was never properly integrated with the weather-resistive barrier underneath.

Partners COS is a restoration contractor that became a custom home builder. That sequence matters. Most builders have never been inside a finished home as a result of their work going wrong. We have — in Wayzata, Orono, Deephaven, Edina, Plymouth, Minnetonka. The neighborhoods where we now build are the same neighborhoods where we learned what fails.

The Details That Look Fine at Inspection But Fail Over Time

Code inspection catches gross failures. It doesn’t catch the details that pass inspection at the time of construction but create problems three, five, or ten years later. These are the details that show up in restoration work.

Window pan flashing integration. A window installed with a proper pan flashing but without correct integration to the weather-resistive barrier underneath will appear perfectly installed on the day of inspection. Water intrusion often doesn’t manifest for two to four years — long enough that the original builder is no longer on the hook, short enough that the homeowner is still paying a mortgage on a new home with a water damage problem. We flash windows the way we flash them because we’ve opened the walls downstream of this failure pattern in homes throughout the western suburbs.

Rim joist insulation. The rim joist cavity — the framing at the top of the foundation wall where floor framing meets the foundation — is one of the most common locations for both energy loss and moisture infiltration. A fiberglass batt stuffed into this cavity meets code. It doesn’t perform the same as closed-cell spray foam, which creates both an air barrier and a vapor retarder in a single application. We specify closed-cell spray foam at rim joists on every home we build as standard practice. Not because code requires it. Because we know what happens when that cavity underperforms over a Minnesota winter.

Foundation waterproofing on lakeshore lots. The standard waterproofing product applied to a poured foundation wall is adequate on a well-drained lot with normal water table conditions. On a Lake Minnetonka lakeshore lot where seasonal water table fluctuation can bring groundwater within two or three feet of the footing, it’s insufficient. We specify a drainage board and dimple mat system on below-grade walls on lakeshore projects — the same system we specify when we’re waterproofing an existing foundation that has failed. The difference is we’re doing it before the concrete is backfilled, which is dramatically less expensive and more effective.

Ice and water shield extent at eaves. Minnesota building code requires ice and water shield to extend to a point 24 inches inside the interior wall line at the eave. This catches most ice dam water events. It doesn’t catch severe ice dam events — the kind that occur during the freeze-thaw cycles that characterize late Minnesota winters — on homes with shallow roof pitches or inadequate attic ventilation. We extend ice and water shield further than code minimum on every project, and we pay particular attention to the relationship between attic insulation, ventilation baffles, and soffit ventilation that prevents ice dam formation in the first place. We’ve remediated too many ice dam claims to approach this detail casually.

What the Claim History Teaches Us About Building

Restoration contractors see insurance claims. Not as statistics — as specific events in specific homes where specific decisions made during construction resulted in specific damage years later.

The claims we see most often in the Lake Minnetonka corridor aren’t random. They cluster around a relatively small number of construction detail categories: water intrusion at window and door openings, ice dam damage at eaves, basement water infiltration, and condensation damage within wall and roof assemblies. These aren’t mysterious failures. They’re predictable failures — the result of construction details that were adequate to pass inspection but not adequate to perform over decades in a Minnesota climate.

When we design and build a custom home, we carry that claim history into every decision. The insulation specification. The flashing sequence. The foundation drainage. The roofing installation. These decisions aren’t made in isolation from the performance data we’ve accumulated from restoration work in the same neighborhoods. They’re made because of it.

The Conversation With Clients That Other Builders Don’t Have

Most new construction clients are thinking about finishes: the cabinet profile, the tile selection, the hardware finish. These decisions matter and we take them seriously. But the most important decisions in a custom home are made before the first interior finish decision — in the foundation waterproofing specification, the wall assembly design, the roof detail at the eave, the flashing sequence at every penetration.

We have a different conversation with our clients than most builders do. We talk about the building envelope as the primary investment — not because we’re trying to upsell them on construction details, but because we’ve watched envelope failures become six-figure remediation projects in homes that were built with the best intentions and adequate-to-code construction.

That conversation is only possible because of the restoration background. A builder who has only built homes has no claim history to draw from. They have no firsthand experience of what their construction details look like three years after the inspector left. We do.

Why This Matters More in the Western Suburbs

The western suburbs of Minneapolis — Wayzata, Orono, Deephaven, Minnetonka, Edina, Plymouth — have a specific combination of conditions that makes envelope performance particularly important: cold winters with significant freeze-thaw cycling, lakeshore lots with elevated water tables and humidity, and homes at the high end of the value spectrum where a remediation event isn’t just expensive but profoundly disruptive to the life of the home.

A water intrusion event in a $2 million custom home on Lake Minnetonka isn’t the same experience as a water intrusion event in a standard suburban house. The materials are more expensive, the finishes are more complex, the homeowners’ expectations are higher, and the disruption of living through a remediation is proportionally greater. The argument for building these homes with envelope details that exceed code minimum is proportionally stronger.

We make that argument because we’ve been on both sides of it — as the restorer doing the remediation in a home where the argument wasn’t made, and as the builder for whom the argument is a statement of practice, not a sales pitch.

The Two Homes We’re Building Now

Partners COS currently has two custom homes under construction — one in the Wayzata corridor, one further west along the Minnetonka shore. Both are applying the construction standards we’ve developed through years of restoration work in the same communities. Both clients chose us, at least in part, because the restoration background wasn’t something we mentioned as a differentiator — it was something that came through in the specificity of how we talked about building.

That specificity is what we bring to every engagement. Not a general commitment to quality, but a concrete, earned understanding of what quality looks like in a building envelope that performs in a Minnesota climate for fifty years.

If you’re building in the western suburbs and you’d like to talk about what that standard means for your project, we’re ready to have that conversation.

The Professional Standard That Governs Restoration Work

Partners COS operates to the technical standards established by the Institute of Inspection, Cleaning and Restoration Certification (IICRC) — the recognized professional standards body for the restoration industry. The IICRC’s S500 Standard for Professional Water Damage Restoration and S520 Standard for Professional Mold Remediation govern the documentation, drying, and remediation protocols used in our restoration work. These standards are also the basis for insurance carrier evaluation of restoration claims — which means our documentation is built around the same framework that adjusters use.

The IICRC S520 Mold Remediation Standard requires documentation of moisture source, affected materials, containment protocols, and clearance testing. Executing mold remediation to this standard requires understanding exactly how moisture moved through a building assembly to create the conditions for mold growth — which is precisely the diagnostic work that informs how we build new construction. The connection between restoration documentation and construction specification is not abstract; it runs through specific material and assembly decisions on every project.

Minnesota’s contractor licensing requirements, administered by the Minnesota Department of Labor and Industry, establish the legal framework for both residential building contractor and remodeler licensing. Partners COS holds the appropriate Minnesota licensing for the full scope of work we perform — custom home construction, remodeling, and restoration — which allows us to execute the combined scopes that insurance-funded renovation requires under a single contractor relationship.

Frequently Asked Questions — Restoration-Builder Advantage