Attic & Loose-Fill Blown Insulation

Attic Insulation & Blown-In Loose-Fill Services for Oklahoma City Homes

Blown insulation is how most Oklahoma City homes add R-value without opening a wall or ceiling: cellulose or fiberglass over the attic floor, dense-pack inside closed walls, and the soffit baffles that keep a deep attic ventilated. Attic height, the ceiling, your walls and the ducts overhead decide which fits, so we start by looking.

An installer in a respirator kneels on a truss in an attic and directs a thick hose that blows gray loose-fill insulation across the attic floor.

How These Systems Differ

Loose-fill insulation is blown from a machine through a hose, so it settles around trusses, wiring, duct runs and odd framing in ways batts cannot. In an attic it builds one continuous blanket over the ceiling, usually right over what is already there. The yardstick is the 2024 IRC as adopted in Oklahoma, which sets R-49 for new ceilings with an attic in climate zone 3. That is a new-construction figure rather than a retrofit obligation, but for an existing attic it is the right target, and many older metro attics sit well short of it.

The two attic fills differ in useful ways. Cellulose, borate-treated recycled paper fiber, commonly delivers about R-3.2 to R-3.8 per inch and reaches R-49 in roughly 13 to 15 settled inches. It resists air drifting through it, but it is heavier and it settles, so it is blown with an allowance. Loose-fill fiberglass commonly delivers about R-2.2 to R-2.9 per inch, so R-49 often takes 18 to 22 inches, but it is light, settles minimally and does not absorb water. It leans harder on wind dams at the eaves, which matters in a state this windy.

Dense-pack and baffles round out the category. Dense-pack uses the same fiber at much higher density, commonly about 3.5 lb/ft³ for cellulose, injected into the closed wall cavities of older homes that are empty or half filled. Baffles and wind dams are not insulation at all. They are the prep that keeps a deep attic venting from soffit to ridge and stops wind from scouring fill back from the outside walls. Most good attic jobs include them, and a top-up without them often ends up choking its own ventilation.

Attic & Blown-In Services

A thick gray cellulose layer covers an attic floor evenly up to the tops of the truss chords, with a wooden hatch dam in the foreground.

Blown-In Cellulose Attic Top-Ups

Borate-treated cellulose blown over thin attic fill toward an R-49 benchmark.

How it works

A deep, fluffy white loose-fill fiberglass layer fills a residential attic between trusses, with baffles visible at the eaves.

Blown-In Loose-Fill Fiberglass

Light, non-settling loose-fill fiberglass, with wind dams to protect the eaves.

How it works

With the siding off an older house, a gloved hand feeds a white fill tube into one of a row of neat round holes drilled through the wood sheathing boards.

Dense-Pack Cavity Injection

High-density cellulose injected into closed walls through small drilled holes.

How it works

Rigid baffles stapled between rafters at the low edge of an attic keep a clear air channel open from the soffit above the insulation.

Attic Venting & Baffle Prep

Rafter vents and wind dams that keep soffit-to-ridge airflow open.

How it works

Choosing Between Them

Room to spare, sound ceiling: Cellulose usually reaches R-49 in the fewest inches, and its dense layer slows air drifting through at the eaves. It suits roomy attics over drywall that is flat and firmly fastened.
A ceiling that should stay light: Where the drywall sags, the framing is widely spaced or the attic has a past leak, loose fiberglass adds far less weight and holds no water, provided there is height for the deeper layer.
Hot walls, adequate attic: If the attic already measures close to R-49 but a summer scan shows empty or slumped wall bays, dense-pack treats the wall directly instead of piling more on the ceiling.
Packed eaves or dead soffits: Start with baffles, wind dams and the soffit intake. Adding fill to an attic whose low vents are already blocked or missing deepens the problem instead of fixing it.

Why It Matters Around Oklahoma City

Summer is the Oklahoma test for an attic. Through July and August the attic in a typical metro home runs well above the outdoor temperature, and in most of those homes the air handler and supply ducts sit right in it. Every thin spot in the ceiling insulation lets that heat into the rooms below, and every leak around the platform or return pulls hot attic air toward the system. Winter matters less but still bites: arctic outbreaks such as the February 2021 cold expose the same thin spots from the other direction, and hard north winds behind the fronts wash loose fill back from the eaves.

The housing stock varies across the metro. Inside Oklahoma City, early-1900s homes near downtown are the dense-pack candidates, mid-century ranch neighborhoods are where thin attics and closed soffits cluster, and newer two-story homes on the city’s edges usually start with the most insulation and have the least to gain. In Edmond, established neighborhoods such as Kickingbird and Oak Tree, largely from the 1970s through the 1990s, may still carry their original attic fill and are worth measuring before deciding anything.

Attic & Blown-In: Common Questions

How can I tell how much insulation is in my attic right now?

Look and measure. From the hatch, push a ruler down through the fill in a few places, including toward the eaves, and note the material. Multiplying the depth by a typical R per inch for that material gives a rough figure to compare with R-49. If the house had insulation added before, the old receipt should state the R-value and thickness. Uneven depth, bare strips at the eaves and hot upstairs rooms are the usual signs.

In what order should attic work be done?

Roughly this order: rule out vermiculite, which has to be tested before it is disturbed; remove wet, moldy or rodent-fouled fill; make sure bath fans vent outside; seal the ceiling-plane air leaks, including around the HVAC platform and return; fit baffles and wind dams at the eaves; dam the hatch, flues and non-rated lights. Then blow the insulation. Reversing that order buries problems under a layer that is hard to work through.

Is attic insulation still worth it when my ducts and air handler are up there?

Usually, yes. Ceiling insulation still slows the heat moving from a hot attic into the rooms, and the ducts benefit when the platform, return and duct joints are sealed at the same time. What it cannot do is cool the attic the ducts sit in. If that matters most to you, an unvented attic with foam on the underside of the roof deck brings the ducts inside the conditioned space, and we can talk through both options.

Other Insulation Services

Spray Foam

Batts & Vapor Control

Removal & Air Sealing

Home Problem Solving

Commercial & Industrial

Talk to Us About Attic & Blown-In

Tell us what the space is and what is going wrong. We will recommend the system that fits, including when a cheaper one will do.

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