Sherborn Insulation for Antique Farmhouses, Barns-Turned-Homes and Newer Colonials

Sherborn is our next-door neighbor. The town line is just a few minutes from our shop on Morton Street in Holliston, and we worked on several Sherborn projects in 2025, from spring through late fall. Sherborn is also unlike most towns we serve. It is rural by design, with large lots, private wells and septic systems, and a lot of open land. The houses range from eighteenth- and nineteenth-century farmhouses to mid-century capes and large colonials built on wooded lots in the decades since. Each of those groups needs a different insulation plan.

Antique homes in and around the town center

Sherborn has a small local historic district in the old town center, and many more antique houses scattered along its older roads. These homes have post-and-beam frames, plank or board sheathing, and fieldstone or rubble foundations. They were heated with fireplaces and stoves, so nobody designed them to hold heat.

What we usually find

• Attic floors with little or no insulation, or a thin layer of old fiberglass laid over loose boards
• Wide gaps around central chimneys, where the framing stops short of the masonry
• Walls with no insulation at all, or with sawdust, newspaper or other early fill that has settled
• Stone foundations and sill areas that let cold air straight into the first-floor framing
• Ells and connected barns added over the years, each with its own roofline and its own leaks

How we approach them

We start with air sealing. In an old house, the attic floor, the chimney chase and the sill area usually move more heat than the walls do. After that, blown-in cellulose on the attic floor is often the best value. Closed walls can sometimes be dense-packed from inside or outside, but only after we check what is in the cavities. Some older houses still have knob-and-tube wiring in service, and it should be evaluated by an electrician before any cavity around it is filled. We look for it before we recommend wall work.

Exterior changes inside the local historic district go through the town’s historic district commission. Insulation is almost always done from the inside, so the face of the house does not change.

Postwar and newer homes on big lots

Much of Sherborn’s housing went up after the war: capes, ranches, garrison colonials, contemporaries and, later, large colonials on long driveways. These houses have their own patterns.

• Bonus rooms over garages. The floor over an unheated garage is one of the most common cold spots we see. Closed-cell spray foam seals and insulates it in one step.
• Cathedral ceilings and great rooms. Vaulted ceilings often have thin batts with gaps at the top. When the ceiling is open during a renovation, spray foam fills the full rafter bay.
• Rim joists and walkout basements. Many Sherborn lots slope, so walkout basements with framed walls are common. The rim joist and the framed sections lose a lot of heat. Both are good candidates for closed-cell foam.
• Tired attic insulation. Attic insulation from the 1970s through the 1990s has often settled, been disturbed by mice, or been crushed by storage. Sometimes the right move is removal and replacement rather than adding more on top.

Barn conversions, studios and outbuildings

Sherborn has a lot of barns, carriage houses and outbuildings, and owners regularly turn them into studios, offices, guest space or living area. These buildings often have no insulation at all, open framing and very large roof areas. Closed-cell spray foam is common here because it insulates, air seals and handles irregular timber framing. For spaces used for music, home offices or guests, we can also add acoustic insulation between rooms and floors.

Insulation services for Sherborn homes

• Open-cell and closed-cell spray foam for walls, roof slopes, rim joists and outbuildings
• Blown-in cellulose and blown-in fiberglass for attics and closed wall cavities
• Fiberglass batts for additions and new framing
• Air sealing around chimneys, top plates, sills, hatches and recessed lights
• Basement, crawl space and rim joist insulation
• Attic insulation removal and replacement
• Acoustic insulation for studios, offices and media rooms
• On-site assessment

Renovations and additions

When a Sherborn house gets an addition or a gut renovation, the walls and roof are open for a short window. We coordinate with your builder so insulation goes in after rough electrical and plumbing and before drywall. If your plans specify R-values, we work to them. For an example of open-wall work, see our closed-cell spray foam before-and-after in Westwood, where walls were foamed to an R-21 target and roof slopes to an R-38 target, and old fiberglass was removed from one roof-slope section first.

We also work in the towns around Sherborn, including Dover, Medfield, Southborough and Natick. Our MetroWest service area page covers the region.