Soundproofing spray foam insulation in St. Paul is interior work, and in a town where most houses predate 1991 and have been renovated more than once, the first thing to establish is what is in the wall you want quieted. Interior partitions in this stock range from an original plaster-on-lath wall with nothing in it, to a 1980s stud wall with batt, to a recent partition built as part of a basement development. All three transmit sound differently and respond differently to being filled.
Open-cell is the material for sound, and here is why
Open-cell foam at roughly R-3.5 to R-3.8 per inch is soft and porous, so it absorbs airborne sound energy inside the cavity. Closed-cell is rigid and dense; it is the better insulator and the better air seal, which is why it is used on exterior assemblies, but a rigid material couples the two faces of a wall more effectively and does less for sound. For an interior partition between two heated rooms, where there is no vapour drive to control, open-cell is the correct choice. Any crew offering closed-cell for a bedroom partition has defaulted to its usual product.
Filling the cavity is only part of the result
Sound travels on air, so every gap matters: the gap under the door, the back-to-back electrical boxes, the opening where a duct crosses the wall, the uncaulked joint where drywall meets floor. Filling a cavity while leaving a two-inch duct opening through the wall produces a disappointment, and that is a common outcome in an old house where a renovation ran a duct through an existing partition and patched around it loosely. Flanking paths through the floor and ceiling do the same thing: sound goes under the wall through a shared joist space and reappears next door.
Where people actually want this in a house here
Three places, consistently. A basement suite or a developed basement under a family's living room, where footfall and voices come straight up through the floor. A bedroom on an addition, where the wall against the original house is a former exterior wall of unknown construction. And a home office or shop office, which in this district frequently shares a wall with a garage, a mechanical room or a laundry, all of which are machine-noise sources rather than voice sources. Those need the equipment vibration dealt with as well as the air path.
Shops, offices and farm buildings
Sound work is not only residential. A shop office, a milking or handling area, a grain-handling building near a yard site, or a service bay with a compressor in it all come up. In a shop, the usual job is an interior office partition and ceiling, where the point is making a phone call possible while work goes on outside the door. Where the same partition also separates a heated office from an unheated shop floor, then it is a thermal boundary as well as an acoustic one, and that changes the material: closed-cell on the cold side for the thermal and vapour job, with the acoustic treatment considered separately.
What to tell us so the quote is right
Which room you are trying to protect, what the noise is, and which direction it comes from. Voices through a wall, footsteps from above, a machine in the next room and traffic from outside are four different problems, and only two of them are solved by what goes in the cavity. We will say where foam will help, and where a solid-core door, a sealed duct boot or resilient channel and a second layer of drywall will do more for the money.
Who does the work
There is no handing you off here. We quote and manage soundproofing spray foam insulation St. Paul start to finish, and our crews do the spraying.
Soundproofing Spray Foam Insulation St. Paul: Common Questions
Which foam is better for sound? Open-cell, because it is soft and porous and absorbs sound energy. Closed-cell is the better thermal and vapour product, not the better acoustic one.
Will filling the wall make the room quiet? It will reduce transmission, but only if the gaps are dealt with too. Back-to-back boxes, duct openings and the gap under the door undo most of the benefit.
We can hear footsteps from upstairs. That is structure-borne, travelling through the joists. Cavity fill helps a little; isolating the ceiling and sealing the shared joist space helps more.
How much does soundproofing spray foam insulation cost in St. Paul? It follows the sprayed area and the thickness, and open-cell fills a full cavity so the depth is set by the framing. Any drywall removal to reach an existing wall is a separate item.
How do I choose a soundproofing spray foam contractor in St. Paul? Ask what else they would do besides fill the cavity. A contractor who only talks about foam is going to leave the flanking paths exactly as they are.
Size the assembly with the R-value calculator, then get a free St. Paul quote. More on Soundproofing Spray Foam Insulation Alberta province-wide.