Demilec Blown-In Insulation in Palo Alto: What to Know First
We provide independent Demilec blown-in insulation service in Palo Alto, typically scheduling within 48 hours and completing most attic jobs in a single day. Most homes in this area run between $2,800 and $5,200 for a full Demilec blown-in installation with air sealing included, and we put that price in writing before any work starts. This page is for homeowners who already have Demilec materials in place and need to know whether to top up, replace, or start fresh with a compatible blown-in system. If you’re seeing uneven temperatures, rising PG&E bills, or insulation that has settled below your joist tops, call (650) 352-3577 and we’ll send a written estimate with no obligation.
How Demilec Products Fail - and How We Fix Them
- Demilec Heatlok HFO Pro settled below grade in attics with active ventilation. The high-pressure blowing required for open-cell compatibility can over-compress the material in older Palo Alto ranch homes near Midtown, where original gable vents create pressure differentials. We remove the compacted layer, re-establish the air barrier at the top plates, and reinstall to the specified settled density with fresh material matched to the original R-value.
- Demilec Sealection 500 shows thermal drift when paired with incompatible blown-in top-ups. Homeowners sometimes add generic cellulose over this medium-density spray foam, trapping moisture at the interface. We find the dew-point failure with infrared imaging, strip the incompatible layer, and apply Demilec-certified blown fiberglass or a sealed foam transition zone so the two systems don’t fight each other.
- Demilec Heatlok Soya HFO shrinks away from top plates in homes built during the 2015-2019 California Title 24 transition. The soy-based formulation can pull back 3-8% from framing edges in the first two heating seasons, leaving gaps that look minor but read as major leaks on a blower-door test. We dense-pack those gaps with Demilec-compatible blown-in before adding the full attic layer, so the thermal boundary stays continuous.
- Demilec Agribalance degrades where roof leaks went undetected in Palo Alto’s intermittent winter rains. The agricultural oil content makes this line more susceptible to mold inoculation than petroleum-based foams. We don’t just replace the wet section; we trace the leak path, document it with photos for your insurance, air-seal the penetration, and reinstall with a vapor-smart blown-in system that won’t repeat the problem.
- Demilec Eco-Pur contact-adhesion failure on dusty OSB in newer construction. In tight new builds where the blower-door number still surprises owners, we’ve found Eco-Pur delaminating from sheathing that wasn’t properly cleaned during the original application. We mechanically prep the surface, spot-treat with compatible adhesive, and supplement with blown-in wall packs where full spray-foam reapplication isn’t cost-effective.
Our Demilec Blown-In Insulation Process
- 1
Call and scope. A live person answers at (650) 352-3577 24/7. We ask about your Demilec product line if you know it, the home’s age, and what you’re experiencing. We schedule a site visit, usually within 48 hours.
- 2
On-site diagnosis with documentation. Our technician inspects the attic or wall cavity, identifies the Demilec series in place, and runs a blower-door test if air sealing is in scope. You get photos of what we found and a written price before any work starts.
- 3
Air sealing first, always. Seal the leaks first. The insulation has nowhere to work if the air is moving around it. We seal top plates, can lights, penetrations, and chimney chases with Demilec-compatible materials.
- 4
Blown-in installation or top-up. We match the new material to the existing Demilec system, whether that’s Heatlok-compatible fiberglass, dense-pack cellulose for Sealection transitions, or a full replacement where the original has failed beyond recovery.
- 5
Post-installation verification. We run the blower-door test again, photograph the completed work, and deliver your documented record: R-value achieved, air-sealing locations, before-and-after CFM50 readings, and the written warranty.
- 6
Cleanup and close. We rebuild any access panels we disturbed (Wes keeps a running list of every one his crew has had to rebuild, and jokes that the list is now longer than his arm), haul away debris, and leave the written scope and 365-Day Done Right Promise in your hand.
What Demilec Blown-In Insulation Costs in Palo Alto
Most Demilec blown-in jobs in Palo Alto fall in these ranges:
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Blown-in top-up over intact Demilec (attic) | $1,800 - $3,400 | Accessibility, existing depth, square footage |
| Full removal + replacement with new blown-in | $3,200 - $5,800 | Contamination level, disposal fees, air-sealing extent |
| Dense-pack wall insulation (Demilec-compatible) | $2,400 - $4,600 | Wall cavity condition, drilling pattern, finish repair |
| Air sealing + blown-in system (complete attic) | $2,800 - $5,200 | Blower-door starting point, top plate access, can light count |
Homes near Old Palo Alto with complex rooflines or multiple attic zones run higher. Newer construction with limited access panels adds labor. We don’t guess; we measure, photograph, and write the price before anyone lifts a tool. Bring us any competing written estimate and we’ll give you a free second opinion, line by line.
Why Palo Alto Homeowners Call Topside Attic Insulation Palo Alto for Demilec Work
We’ve been independently owned and operated under The Haven Standard since 2016, and we’ve sealed and insulated over 9,000 homes with a written price before work started every time. Wes Okafor learned the trade at Richard J. Daley College, where air sealing came before insulation in the curriculum, and that sequence still governs how we run every Palo Alto job. Our technicians are background-checked and uniformed, and they know the difference between Heatlok HFO Pro and Sealection 500 without checking a cheat sheet. We source materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, plus Reflectix when radiant barriers make sense, so we’re never locked into a single product line that doesn’t fit your house. Every job ends with a Documented Photo Record and, where scoped, before-and-after blower-door numbers you can hold in your hand.
FAQs
No, but the warranty coverage depends on which Demilec line was originally installed and whether the original application was registered. Demilec’s limited warranty covers product defect, not installation error, and it doesn’t require manufacturer-authorized service for blown-in top-ups or compatible repairs. We document the existing product condition with photos before we start, so if a latent defect surfaces later, you have evidence. Call (650) 352-3577 and we’ll review your specific line’s warranty terms during the estimate.
Yes, and we specify the achieved R-value in writing before installation. Demilec spray foam originals are often R-6 to R-7 per inch; blown-in fiberglass or cellulose needs greater depth to hit equivalent thermal resistance, which means we verify your attic has the structural capacity and ventilation clearance to accommodate it. If depth is limited, we may recommend a hybrid approach with rigid board at the eaves. The written scope shows exactly what R-value you’ll get and where.
Most attic jobs finish in one day; dense-pack wall work or full removals with air sealing typically take two. We schedule within 48 hours of your call, and our crew arrives on time with a named technician and a text when they’re on the way. Under Haven Standard: Arrive on schedule, you get a named technician and a text when they are on the way.
Repair is cheaper when the Demilec layer is structurally intact, properly adhered, and simply underperforming due to settlement or inadequate original thickness. Replacement becomes the better value when we find moisture damage, delamination, or incompatible materials layered on top that compromise the thermal boundary. We show you both options with written prices for each, so the decision is based on numbers, not pressure. Estimates are free.
You get a written pre- and post-installation report with the R-value achieved, air-sealing locations documented with photos, and the final blower-door result if a test was scoped. This is standard on every job, not available on request. Wes also does a combustion-safety check on any gas appliance in the attic space before the job closes, because depressurizing a house without verifying the flue draft first is how carbon monoxide problems start. That check result goes in your file too.
Written by Wes Okafor, Owner, Topside Attic Insulation Palo Alto at Topside Attic Insulation Palo Alto, serving Palo Alto and nearby areas.