Spray Foam Insulation in Shrewsbury, PA

Spray Foam Insulation in Shrewsbury serves a mostly owner-occupied borough near the Maryland line. Point2Homes' census summary shows 16.5% of homes from the 1970s, 20.4% from the 1980s, 14.9% from the 1990s and 16.3% from the 2000s. About 80.3% of occupied homes are owner-occupied and 77.1% are detached.

Historic borough

Shrewsbury was incorporated on August 9, 1834, and the Shrewsbury Historic District was listed on the National Register in 1984. Wikipedia counts 1,617 housing units in 2020.

What we see

Homes from the 1970s and 1980s need attic sealing and depth and rim joist foam. 1990s and 2000s homes need bonus rooms and knee walls sealed. Historic homes need careful wall and attic work.

Code and climate

Shrewsbury sits in York County's Climate Zone 4A. Pennsylvania's code lists R-49 for ceilings and R-20 or R-13 plus R-5 continuous for walls. For existing attics, ENERGY STAR recommends R-60 when uninsulated, or adding R-49 over 3 to 4 inches. Many 1970s and 1980s homes here started with less than that and have settled since. Sealing the attic floor first, then blowing insulation to depth, and foaming the rim joist cover most of what these houses need. Bonus rooms in 1990s and 2000s homes get their knee walls and garage-ceiling floors sealed and insulated.

Historic district homes

Homes in the Shrewsbury Historic District need methods that leave the exterior unchanged. Dense-pack can go in from the inside through small holes that are patched, or from under existing siding where it can be lifted. Attics and rim joists are out of sight and can get the full treatment: air sealing, insulation to depth, and closed-cell foam on the rim. We check wiring before filling any walls, since older homes may still have knob-and-tube in places.

Call (717) 864-6430 or get a free estimate for a visit and written price.