Knauf Attic Insulation Nationwide

Knauf Attic Insulation: The Palo Alto Owner’s Guide

Knauf attic insulation installed in Palo Alto homes typically runs $2.80 to $4.20 per square foot for blown-in fiberglass, with most complete attic jobs falling between $3,200 and $5,800 depending on access difficulty and whether air sealing is needed first. We stock Knauf EcoFill and Jet Stream MAX products on our trucks and can usually schedule installation within 48 hours. Most owners realize their insulation is failing when upstairs rooms stay hot through Palo Alto’s September heat waves despite the AC running, or when Pacific Gas & Electric bills spike 30% or more year-over-year with no rate change.

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Which Knauf Models This Applies To

We install and replace three main Knauf product lines common in Palo Alto attics: EcoFill Wx blown-in fiberglass (the white loose-fill you see in most ranch homes built 1950-1990), Jet Stream MAX (the higher-density blown-in used in tighter new construction and deep-fill retrofits), and Knauf Insulation Board (rigid foam board, typically found in kneewalls or dropped soffits in Eichler and similar mid-century builds).

To identify what you have, check for a paper bag or printed strip left by the original installer, usually near the attic hatch or stapled to a rafter. EcoFill Wx bags show a pinkish-white product with a density around 0.5 lbs per cubic foot; Jet Stream MAX is denser at 1.0-1.3 lbs per cubic foot and settles less over time. If you find no label, measure the settled depth against the joist height. In Palo Alto’s older Midtown ranches, we regularly see EcoFill that has settled from an original R-38 to an effective R-19 or lower after 15-20 years.

We source Knauf materials through standard distribution channels, same as any independent contractor. We’re not affiliated with Knauf Insulation, Inc., and we also stock Reflectix radiant barrier products when a hybrid system makes sense for a given roof assembly.

Signs Your Knauf Attic Insulation Is Failing

• Uneven temperatures room-to-room. In Palo Alto, we see this most in homes with original EcoFill where wind washing through soffit vents has scoured insulation away from the eaves, creating bare strips along the attic perimeter. The master bedroom over the garage gets hit hardest because garage ceiling assemblies rarely get the same attention as living space.
• Ice damming or persistent moisture stains on ceiling drywall. This sounds wrong for Palo Alto’s mild climate, but we find it every winter in homes near the Foothills where nighttime lows drop below 40°F for weeks. Failed insulation lets warm, moist interior air hit cold roof sheathing; the condensation follows the rafter line down and stains the ceiling below.
• Insulation that compresses or disintegrates when touched. Knauf fiberglass doesn’t rot, but it does break down mechanically after 20-25 years, especially if rodents have nested or if the original installer left gaps around recessed can lights that became heat chimneys. We document this with photos on every removal job.
• Visible gaps around penetrations, top plates, or the attic hatch. These aren’t insulation failures exactly, but they make insulation irrelevant. Stack effect, the buoyancy of warm air rising and pulling cold air in at the base of the house, will overpower any R-value if the pressure boundary is leaky. We test for this with a blower-door test, a pressurization reading that shows, in one number, how much air your building envelope is losing.
• Settled depth below current Title 24 standards. California’s energy code now calls for R-38 to R-60 in attic spaces depending on climate zone. Palo Alto sits in Climate Zone 3, where R-38 is minimum and R-49 is typical for retrofits. If your Knauf product has settled below the joist tops, you’re likely under R-30 effective.

Replacement Cost & What’s Included

What drives the range: attic access (a 24-inch hatch versus a pull-down stair changes labor hours), whether we need to build a raised storage platform or dam around the furnace, and the condition of existing insulation. If rodents have contaminated the old material, removal adds $0.60-$0.90 per square foot for safe handling and disposal per California waste regulations.

Every job starts with a written price before any work starts, Haven Standard Clause 1. The scope specifies the Knauf product, the target R-value, the air-sealing locations, and whether a blower-door test is included. We publish before-and-after blower-door numbers on every applicable job so you can verify the air-sealing result. The 365-Day Done Right Promise covers all completed work.

DIY or Call Us?

Here’s what a Palo Alto homeowner can safely check: measure settled insulation depth with a yardstick, photograph any obvious gaps or compressed areas, and look for moisture stains or rodent droppings from the attic hatch. Do not disturb vermiculite insulation, which may contain asbestos and requires testing before any work begins.

Here’s where DIY goes wrong: blowing new insulation over unsealed leaks is throwing money away. The insulation has nowhere to work if the air is moving around it. We also see homeowners install baffles incorrectly, blocking soffit vents and trapping moisture, or compress fiberglass batts into tight spaces which reduces R-value by half. And any work near gas appliances in the attic, including water heater flues or furnace venting, requires a combustion-safety check we perform before the job closes. Depressurizing a house without verifying the flue draft first is how carbon monoxide problems start.

If you’re unsure what you’re looking at, call (650) 352-3577. We offer a Free Second Opinion on any written estimate, and we’ll read a competing quote with you line by line.

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