Spray Foam Insulation in Irondale, AL

Spray Foam Insulation in Irondale mostly involves two kinds of homes. Point2Homes' summary of 2019-2023 Census survey data shows 33.4% of Irondale's houses were built in the 1970s and another 18.9% in 2010 or later, with a median year built of 1979. The town is far older than its houses suggest: it incorporated on October 19, 1887, and was named for the Irondale Furnace. Its population stayed under 2,000 until 1960, then grew to 13,497 by 2020.

The 1970s house

A typical 1970s Irondale home has a low-slope attic with a few inches of fiberglass, original single-pane or early double-pane windows, walls with thin batts, and either a crawl space or a slab. The ductwork is often original and may run through a crawl space or attic with minimal insulation. Air leaks are everywhere: top plates, plumbing chases, the attic hatch, recessed lights and the gap where the house meets its foundation.

Fixing it in order

We start with the attic floor: sealing the leaks, then blowing cellulose or fiberglass to the Department of Energy's recommended depth for Zone 3. In houses on crawl spaces, closing the vents, adding a vapor barrier and foaming the walls and rim joists keeps the space dry and the floors comfortable. Walls can be filled with dense-pack cellulose through small holes. Each step stands on its own, so you can do them in stages.

Newer homes

Homes built since 2010 were built closer to today's standards, and those finished after Alabama's 2016 code update had to pass a blower door test under 5 air changes per hour, according to Alabama Power's summary. They still benefit from attention to bonus rooms, vaulted ceilings and attic ducts, and from a top-up if the attic insulation was installed at the minimum.

On the hills east of Birmingham

Irondale sits at about 922 feet, northeast of Homewood and Mountain Brook. Many homes are on sloped lots, which means partially exposed foundations and crawl spaces that are tall on the downhill side. Closed-cell foam on exposed foundation walls helps with both comfort and moisture.

A historical footnote

Wikipedia records a magnitude 5.1 earthquake near Irondale in 1916 that caused some damage and was felt in neighboring states. It is a reminder that older foundations here have seen a lot; we check for cracks and gaps in foundation walls as part of any crawl space work, since those are also air and moisture paths.

Spray foam insulation cost for an Irondale crawl space

HomeGuide's national figures put crawl space encapsulation at $3 to $10 per square foot, a vapor barrier at $1,200 to $4,000, and closed-cell foam on crawl space walls at $2 to $5 per square foot. A 1970s house with a modest crawl space usually lands toward the lower end, but standing water, low clearance or debris to remove can push it up. We price it after crawling the space.

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