Owens Corning Attic Insulation Nationwide | Walt’s Insulation

Owens Corning Attic Insulation: The San Jose Owner’s Guide

If your Owens Corning attic insulation has settled, gotten wet, or been chewed through by rodents, we can replace it fast. Most San Jose homeowners pay between $1,400 and $3,200 for a full attic insulation removal and Owens Corning blown-in replacement, depending on attic size and R-value. We stock Owens Corning AttiCat and ProPink on our trucks, so same-day and next-day installation is usually available across San Jose, Willow Glen, Almaden, and Campbell. Most folks discover their insulation has failed the same way: a bedroom that won’t hold temperature, a utility bill that jumped 30%, or a contractor peeking into the attic during another job and finding the fiberglass matted flat like a pancake.

Call (408) 837-7384

We’re an independent insulation contractor, not an Owens Corning affiliate, but we’ve installed their products since 2000 and know exactly how they behave in San Jose’s climate: hot dry summers, cool damp winters, and attics that hit 140°F in August.

Which Owens Corning Models This Applies To

For attic applications, Owens Corning’s lineup breaks into two families: the AttiCat blown-in system and the ProPink batt lines (EcoTouch and R-30/R-38 faced batts). If your attic has pink blown-in fiberglass that looks like cotton candy, that’s AttiCat Expanding Blown-In PINK Fiberglas Insulation, installed through 2.5-inch hoses and rated from R-19 to R-60 depending on depth. If it’s rolls or rectangular batts laid between joists, it’s EcoTouch or the older ProPink line, stamped with the R-value on the facing.

The gotcha for San Jose homeowners: blown-in fiberglass settles over time, especially if it was installed over a gap where the old insulation was removed unevenly. AttiCat is engineered for 1% settling at proper density, but under-blown spots settle far more. The R-value on the bag assumes a specific inches-of-depth ceiling of 22 inches for R-60 at the full weight. If a handyman “topped off” your attic with half the bags needed, you’re not getting the R-value on the label. We measure with a depth gauge before we quote, so you know what you actually have up there.

For batt replacement, the common swap in San Jose is switching older R-19 batts (roughly 6 inches) to R-38 (12 inches) or R-49 (14 inches) to meet California Title 24 energy requirements. Owens Corning EcoTouch batts are also the go-to when we need to add insulation around recessed can lights without creating a fire hazard, they’re cut to fit with a 3-inch clearance maintained.

We also stock Reflectix radiant barrier for San Jose attics with poor ventilation, it’s the one foil product we recommend pairing with Owens Corning insulation when roof deck temps are driving the heat load.

Signs Your Owens Corning Attic Insulation Is Failing

• Upstairs rooms run 8-10 degrees hotter or colder than downstairs. This means your attic insulation has settled below the top of the ceiling joists, and heat is moving straight through the exposed wood framing.
• Energy bills spiked without a change in your habits. In San Jose, a well-insulated attic holds your AC’s work at bay. When your PG&E bill climbs while the thermostat stays put, the insulation is no longer doing its job.
• You see damp spots, water staining, or blackened insulation in the attic. Roof leaks in San Jose’s winter rainy season soak fiberglass and collapse its loft. Wet insulation loses R-value and can start mold growth within 48 hours.
• Rodent droppings or tunnels through the insulation. Rats and mice in San Jose attics burrow through Owens Corning fiberglass like it’s a hotel. They compress it, tear it apart, and leave urine-soaked nests that need full removal, not a patch job.
• Insulation is flat, gray, or crusty to the touch. Attic fiberglass that’s been in a San Jose attic for 20+ years gets dusty, matted, and sometimes crusted over from old roof debris. Flat insulation isn’t trapping air, and air is what makes it work.

Replacement Cost & What’s Included

Here’s what we charge in the San Jose area, and what drives the final number:

• Full removal of old attic insulation: $0.90 to $1.50 per square foot, including bagging, HEPA vacuuming, and disposal. Most San Jose attics run 1,200 to 1,800 square feet.
• Owens Corning AttiCat blown-in installation at R-38: $1.10 to $1.80 per square foot installed, which for a 1,500-square-foot attic lands between $1,650 and $2,700.
• Owens Corning EcoTouch batt replacement at R-38: $1.40 to $2.10 per square foot installed. Slightly higher because batt installation is more labor-intensive around framing and obstructions.
• Air sealing before insulation: $375 to $700 for a typical San Jose attic, and it’s the step that makes the insulation actually work. Skip it, and you’re insulating a leaky box.

Every quote includes removal disposal fees, material, labor, and the Done Right Promise: if our Owens Corning installation isn’t done right, we make it right, for life. Seniors and veterans get 10% off the total, always, and we knock $40 off any repair over $200.

DIY or Call Us?

You can safely pull back a batt in one corner and check the depth, the color, and whether it’s damp or full of droppings. What you shouldn’t do is try to remove and reinstall a full attic’s worth of fiberglass yourself without a full-face respirator, a Tyvek suit, and a commercial HEPA vacuum. Fiberglass dust is brutal on lungs and skin, and moving old insulation around a dark San Jose attic means walking on joists with a real fall risk through the ceiling below. Rodent-contaminated insulation is worse: it carries hantavirus risk, and we suit up with respirators and gloves before that removal starts.

If your attic just needs a top-off over a decent existing layer, that’s a weekday job for us: blow in the difference, check the depth with a gauge, and walk away. If you’re not sure what you have, call (408) 837-7384 and we’ll send a background-checked tech to look. The estimate is free, and there’s no trip charge inside the county.

FAQs