On the National Road
Spray Foam Insulation in Plainfield, IN
A Quaker town from 1839 that grew from 2,585 people in 1950 to nearly 35,000.
- Free on-site estimates
- Written quotes that list material, thickness and R-value for each area
- Air leaks, moisture and old insulation checked before anything is covered

A Quaker Town That Kept Growing
Spray foam insulation in Plainfield covers homes from almost two centuries. Wikipedia says Levi Jessup and Elias Hadley laid out the town in 1839, the same year it incorporated, and that the name comes from the Quakers who settled it. The National Road, U.S. 40, runs through town as Main Street, and the Plainfield Historic District is on the National Register. The town grew from 2,585 people in 1950 to 5,460 in 1960, 18,396 in 2000 and 34,625 in 2020. The 2020 census counted 13,512 housing units.
Older homes along Main Street
Houses near the historic center are the oldest in town. They often have balloon framing, plaster, deep attics and crawl spaces or small basements under additions. We start with the attic floor and the rim and crawl space, check wiring and moisture, and use foam where loose fill cannot reach.
Postwar and 1960s homes
Plainfield more than doubled between 1950 and 1960. Ranches from that era are now over sixty years old and typically have thin attic insulation, open rim joists and vented crawl spaces. Closing the crawl space and sealing the rim usually fixes cold floors.
Newer subdivisions
The homes built since 2000 make up a large share of the town. The work there is targeted: rims, garage ceilings under bonus rooms, attic hatches and can lights.
Two creeks and till plain
White Lick Creek flows south through the western side of town, and Clark's Creek runs on the east side. Wikipedia places Plainfield in the Central Till Plains region. The USDA describes the Crosby soils common on those till plains as somewhat poorly drained, with a perched water table 0.5 to 2 feet down in winter and spring. Crawl spaces here often run damp, and a sealed vapor barrier is a common part of the job.
Homes near the National Road
Houses on and near Main Street have seen many updates. We often find a mix of insulation types in the attic, from old rock wool to newer fiberglass, and gaps where wiring and plumbing were added. Sealing those gaps before adding insulation is the key step.
Ranches with ducts in the crawl
Many 1960s Plainfield ranches run ducts through the crawl space. Bringing the crawl space inside the insulated envelope keeps the ducts from sweating in summer and losing heat in winter.
Code zone
Hendricks County is in Climate Zone 5A, per OpenEI. Get a free estimate
What to Know in Plainfield
- Quaker founding. Laid out and incorporated in 1839; named for its early Quaker settlers; the Plainfield Historic District is on the National Register (Wikipedia).
- Growth. Population was 2,585 in 1950, 5,460 in 1960, 18,396 in 2000 and 34,625 in 2020; 13,512 housing units in 2020 (Wikipedia).
- Till plain soils. Plainfield lies in the Central Till Plains; Crosby soils there are somewhat poorly drained with a perched water table 0.5 to 2 feet down in winter and spring (Wikipedia, USDA).
- Creeks. White Lick Creek flows south through the west side of town and Clark's Creek through the east side (Wikipedia).

Plainfield Questions
Do older Plainfield homes have damp crawl spaces?
Many do, because local till soils hold water. A sealed vapor barrier, closed vents and foam on the walls usually help.
What should I do first in a 1960s ranch?
The crawl space and rim joist, then the attic.
Can you insulate a historic house on Main Street?
Yes, carefully, starting with attics, rims and crawl spaces after checking wiring and moisture.
My attic has several kinds of old insulation. Does it all need to come out?
Not usually. If it is dry and clean, we seal the gaps and add new insulation on top.
Free Estimates in Plainfield, IN
Plainfield homeowners: free written estimates.
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