Burnsville Wood Flooring has been installing and refinishing wood flooring in Apple Valley for more than twenty years, and a large share of that work sits on a second floor with somebody else’s ceiling underneath it. A townhome or twinhome floor is not only a floor. It is also the top half of an assembly that another household listens to every evening.
That changes the order of the job. Before we get to white oak against hard maple, we find out what the governing documents ask for, what the assembly under the existing floor already is, and whether the sound rating expected of it can be met with the floor you actually want. Getting that sequence wrong is expensive in a way it never is in a detached house, because the correction lives under the finished surface.
We read indoor relative humidity with a hygrometer on the first visit and write the number down, and we check the moisture content of the flooring against the moisture content of the subfloor before a board goes down rather than after. The crew that walks the estimate is the crew that runs the sander and rolls the last coat.
Why more than a quarter of the owner market here shares a party wall
Of the 22,013 housing units in this city, 27.5 percent — 6,061 of them — are one-unit attached structures. Among owner-occupied units the share is slightly higher: 4,501 of 15,880, or 28.3 percent, are attached townhome or twinhome product, against 10,505 that are one-unit detached. Ownership is the norm here at 73.4 percent of occupied units, so most of those attached homes belong to the person standing on the floor.
What the structure count actually counts
Those figures come from the American Community Survey’s structure tables, and they count walls, not paperwork. A one-unit attached record says the dwelling shares at least one wall with another dwelling and has its own separation from ground to roof. It says nothing about what any particular home’s recorded documents require, and we never infer that from a structure count — we read the documents for the address we are working on.
What the number does tell us is how ordinary the problem is. In a city where better than one owner in four has a neighbor through the wall, and frequently a neighbor beneath the floor, a flooring plan that treats sound as an afterthought is a plan that gets stopped partway through.
Age of the housing and what sits under the boards
The largest single build cohort here is the 1990s at 22.9 percent of units, with the 1980s at 20.7 percent and the 1970s at 20.1 percent behind it. That matters because the subfloor in a townhome of that era is usually a sheet product over engineered joists or trusses, and the deflection, the fastener gauge and the fastener spacing schedule we plan for all follow from what is genuinely there.
So we measure instead of guessing. A plywood subfloor and an OSB subfloor hold cleats and staples differently, flatness tolerance decides whether self-leveling underlayment belongs in the quote, and in an attached dwelling every one of those answers feeds straight back into which assembly can hit the required rating.
Squeak is the other thing age brings, and it carries further in an attached dwelling because the household below hears it too. We establish whether the noise is fastener movement, a gap between sheet and joist, or the finish floor itself before quoting a remedy.
Looking for wood-flooring closer to Savage? See Wood-Flooring Services in Savage.
What IRC Appendix K asks of a floor in an attached dwelling
Appendix K of the International Residential Code is the sound transmission appendix, and where it has been adopted it asks for a sound transmission class of 45 and an impact insulation class of 45 in the assemblies that separate one dwelling unit from another. Work in this city is done under the Minnesota State Building Code — Minnesota Rules chapters 1300, 1303, 1305 and 1309 — as administered by the City of Apple Valley, so the first question on any attached job is which code path the building was built and is regulated under.
That question is not rhetorical. The IRC covers one- and two-family dwellings and townhouses; a multi-story building permitted under the International Building Code sits on a different path with its own provisions, and we do not carry a number across from one to the other. We establish what applies to your building rather than quoting an appendix at it.
Airborne and impact are two different tests
Sound transmission class is measured under ASTM E90 and describes airborne sound: voices, a television, a phone on speaker. Impact insulation class is measured under ASTM E492 and describes footfall, a dropped set of keys, a chair leg pushed back from a table. A hard surface barely moves the airborne number and can move the impact number a long way in the wrong direction, which is why a carpet-to-hardwood conversion is the request that most often ends up in front of a board.
Both ratings belong to the whole assembly, never to the flooring alone. The finish floor, the underlayment, the subfloor, the cavity and the ceiling below behave as one system, and replacing the top layer changes the outcome of a test that was performed on all of it together.
A permit exemption is not a rule exemption
Minnesota Rules 1300.0120, subpart 4, item A, sub-item (8) exempts painting, papering, tiling, carpeting, cabinets, countertops and similar finish work from permit. Subpart 4 also states plainly that an exemption does not authorize work performed in violation of the code or of any other ordinance.
A floor replacement therefore does not usually pull a permit here, and that is precisely why people assume nothing else applies to it. The sound provisions, the recorded documents for the property and any rental obligation attached to it are all still in force. Nobody is scheduled to arrive and catch a mistake, which moves the whole burden onto the specification written before the work starts.
Getting approval in hand before the underlayment is ordered
Common interest communities in Minnesota operate under the Minnesota Common Interest Ownership Act, and the documents recorded for a particular community are where its flooring rules actually live. We sort out association and board paperwork before an upstairs job begins, because a job halted at the demolition stage is the worst possible place for one to stop.
What a board usually asks to see
Requests vary between communities, but the recurring ones are predictable: the rating the finished assembly has to achieve, a named underlayment product or an approved equivalent, documentation of the tested assembly it belongs to, proof of insurance, permitted work hours, and protection for shared stairs, halls and entries. Many communities want the request in writing a set number of days before the start date.
We hand over a written grit sequence and finish schedule with the quote as a matter of routine, and in an attached dwelling that document does double duty. It is something a board can read and respond to, and it is something the finished job can be checked against afterward. A quote that says only sand and finish answers none of the questions a board is going to ask.
The order matters more than the paperwork does
Approval first, then the order, then demolition. Underlayment for a rated assembly is frequently a specified product rather than a generic roll, it is not always sitting in a warehouse, and the tested assembly it forms part of is the thing being approved in the first place. Ordering ahead of approval is how a homeowner ends up owning a pallet of the wrong material.
We also sequence work around the heating season rather than in spite of it. In an attached dwelling that has a practical edge: acclimation needs conditioned space, and conditioned space in January is dry space, which is a fact to plan around rather than discover.
If the townhome is or becomes a rental
City Code Chapter 122 requires every residential rental property in the city to be registered with the city by the owner or the rental manager. Registration is free and owner-occupied property is exempt, but re-registration is required within thirty days of a change in ownership, management, unit count, or a change from owner-occupied to rental.
That last trigger is the one that catches people. An owner who moves out, keeps the townhome and rents it has thirty days, and it is far easier to handle in the same stretch of administration as the board submittal than to remember it a year later.
Choosing an assembly that meets the rating without losing the floor you wanted
The common fear is that a sound requirement means accepting whatever a neighbor was approved for two years ago. In practice there is more room than that, because the rating belongs to the assembly and there is more than one way to build one that performs.
Assembly first, then the board you like
Nail-down installation over a rated mat, glue-down over a sound membrane, and a floating engineered floor over a resilient underlayment are three routes toward a similar result, and they differ in every other respect — height at the threshold, feel underfoot, how a future refinish will go. Reducers, T-molds and nosings all have to land at the new height, and on a stair the tread, riser and nosing detail becomes its own decision rather than a trim afterthought.
Species and format survive this conversation more often than people expect. White oak, red oak, hard maple and hickory all sit on top of the same assembly, and Janka hardness governs denting rather than sound. Wide plank, wire-brushed and hand-scraped surfaces are appearance decisions, not acoustic ones, and herringbone and chevron layouts change the labor rather than the rating.
Humidity is the other half of the specification
A wood floor is specified for a relative humidity band — thirty to fifty percent is the usual target — and most heated Minnesota houses fall out of it in January. We read the number with a hygrometer on the first visit and record it, and we check the moisture content of the flooring against the subfloor so the moisture content differential is known before installation rather than diagnosed afterward.
That is what stands between a floor and dry cupping, crowning or seasonal gapping. We measure winter gapping and explain it before anyone calls it a defect, because a good share of it closes again by June. Where hydronic radiant floor heat sits under an upstairs floor, the eighty degrees Fahrenheit surface temperature limit is part of the specification and not a suggestion, and a whole-house humidifier belongs in the conversation before the flooring is ordered.
Refinishing rather than replacing
An engineered floor already upstairs is often the simplest way to satisfy everything, because the assembly beneath it is in place and already accepted. We measure the wear layer before quoting a refinish, since past a certain thickness there is nothing left to sand, and we price a screen-and-recoat honestly against a full sand-and-refinish, including the occasions when the cheaper one is the right one.
When a full refinish is the answer, dust containment runs on every sanding job and we give a straight answer about what it does not catch. Waterborne polyurethane and oil-modified polyurethane differ in cure time as much as in dry time, and in a building with shared entries that difference decides how long the hallway smells like a job site.
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