Demilec Blown-In Insulation in Mountain View: What to Know First
We provide independent Demilec blown-in insulation service in Mountain View, typically scheduling within 48 hours and completing most attic jobs in a single day. Every job starts with a written price before any work begins - no exceptions, no surprises. Most Mountain View homeowners with Demilec systems reach us because their insulation has settled below the original R-value, their attic was insulated before the top plates were sealed, or they’re seeing uneven temperatures between rooms that weren’t there five years ago. If you’re in Rex Manor, Cuesta Park, or anywhere between El Camino and the foothills, call (669) 259-0406. We’ll read your situation with you and give you a flat price you can hold in your hand.
How Demilec Products Fail - and How We Fix Them
- Demilec SEALECTION AgriBalance settled below labeled depth in attics with active ventilation gaps. The cellulose binder in early AgriBalance lots can degrade when attic humidity cycles above 70% repeatedly, which happens in Mountain View’s spring marine layer months. We remove the compacted material, seal the ventilation bypasses at the soffits and ridge, then reinstall to a measured, settled depth that actually hits R-38.
- Demilec HEATLOK Soya HFO shrinkage at wall top plates creates thermal bypasses. The soy-based content in HEATLOK Soya HFO can contract 5-8% in the first three years if the substrate temperature was below 60°F during installation - common in unconditioned Peninsula garages and bonus rooms. We dense-pack the cavity with compatible blown-in fiberglass after sealing the plate gaps with acoustic sealant, not canned foam that voids the remaining warranty.
- Demilec HEATLOK XT bridging in vaulted ceilings with inadequate vent chutes. When XT is sprayed too thin at the heel of a vaulted roof, convective looping carries moisture to the underside of the deck. We don’t respray over the problem; we strip the compromised area, install proper vent chutes, then blow in cellulose to maintain the assembly’s drying potential while restoring R-value.
- Demilec APX 500 degraded at can-light penetrations due to thermal cycling. The APX 500 open-cell foam adjacent to non-IC-rated fixtures can powder at the edges after 6-10 years of 40°F nightly swings in Mountain View’s microclimate. We cut back to sound substrate, install fire-rated covers, then dense-pack the surrounding cavity with blown-in fiberglass so the next inspector doesn’t flag it.
- Demilec ECO-TOUGH surface friability in crawl spaces with seasonal groundwater. When the vapor barrier was omitted or punctured, ECO-TOUGH’s surface can chalk. We don’t encapsulate over active moisture; we remediate the drainage first, then use blown-in closed-cell replacement only where the structural assembly requires it, with full photo documentation for the next tradesman.
Our Demilec Blown-In Insulation Process
- 1
Call and scope. You describe the symptoms - hot rooms, high bills, visible settling. We schedule a site visit in Mountain View, usually within 48 hours.
- 2
Blower-door test and thermal imaging. We pressurize the house and record the CFM50 baseline. The thermal camera shows us where the Demilec product is performing and where it isn’t. You get these images in your documented photo record.
- 3
Air sealing before any insulation touches the attic. Top plates, wire penetrations, can lights, chimney chases - every leak gets sealed with appropriate material. Seal the leaks first. The insulation has nowhere to go if the air does.
- 4
Material selection and written price. We specify the replacement blown-in product - Demilec-compatible or, when appropriate, Owens Corning, Johns Manville, or GreenFiber - with a flat price, written scope, and written warranty before anyone lifts a tool. Haven Standard Clause 1.
- 5
Installation and verification. The crew installs to depth, verifies coverage with depth markers, and re-runs the blower-door test. You get the before-and-after CFM50 in writing.
- 6
Cleanup and documentation. We leave the attic cleaner than we found it. You walk away with the photo record, the blower-door printout, and the 365-Day Done Right Promise in hand.
What Demilec Blown-In Insulation Costs in Mountain View
Most Demilec blown-in insulation jobs in Mountain View run between $2,800 and $6,400 for a single attic, depending on what we find when we lift the hatch.
| Scenario | Typical Range |
|---|---|
| Top-up blown-in cellulose over existing Demilec (air sealing already adequate) | $2,800 - $3,900 |
| Removal of settled AgriBalance or HEATLOK, air sealing, reinstall to R-38 | $4,200 - $5,800 |
| Dense-pack wall insulation after Demilec shrinkage remediation | $3,600 - $6,400 |
| Vaulted ceiling strip, vent chute install, blown-in replacement | $5,100 - $7,200 |
What moves the price: square footage, current depth and condition, accessibility (truss spacing, ductwork in the way), and whether we find unsealed penetrations that should have been handled years ago. We don’t upsell; we document what we found and give you one flat price. Call (669) 259-0406 for a free estimate - we’ll read your situation with you and put the number in writing before we leave.
Why Mountain View Homeowners Call Topside Attic Insulation Mountain View for Demilec Work
We’ve been in Mountain View attics since 2016 - Rex Manor, Waverly Park, the Eichlers near San Antonio Road - and we’ve seen what happens when blown-in goes in before the air sealing is finished. Wes Okafor sequences every job the same way: blower-door test first, seal every penetration, then insulate. You get the before-and-after CFM50 in writing, not a handshake and a promise. Our technicians are background-checked and uniformed; the phone is answered by a live person, 24/7. We also service Reflectix and every major insulation brand, so if your assembly needs a hybrid solution, we won’t force a Demilec-only answer. The 365-Day Done Right Promise applies to everything we touch.
FAQs
No - Demilec’s product warranty covers material defects regardless of who installs or services it, provided the original installation met their published specs. As an independent Demilec service provider, we document the existing conditions with photos and blower-door data so any future warranty claim has a clear baseline. Call (669) 259-0406 and we’ll review your documentation with you.
We source Demilec products through standard distribution when they’re the right choice for the assembly, but we’re not locked in - we also carry Owens Corning, Johns Manville, Knauf, and GreenFiber. If your job calls for a Demilec-compatible blown-in product, we’ll specify it in the written scope. If a different material performs better for your specific failure mode, we’ll tell you why and show you the data.
Top-ups are cheaper upfront but rarely fix the underlying problem. If your AgriBalance or HEATLOK has settled because of unsealed air leaks, adding more material on top just buries the bypass. We quote both options: the top-up price and the remove-seal-replace price, with the blower-door numbers to show what each option actually buys you. Most Mountain View homeowners who plan to stay in the house more than three years choose the full remediation.
Most single-attic jobs are completed in one day, with the blower-door test and air sealing done in the morning and the blown-in installation finished by mid-afternoon. We schedule within 48 hours of your call, and we don’t book more than we can finish properly. Call (669) 259-0406 - we’ll give you a specific date and a two-hour arrival window.
You get four things: the written scope and flat price (before work starts), the documented photo record of conditions and completion, the before-and-after blower-door test results showing CFM50 and ACH50, and the written 365-Day Done Right Promise. Haven Standard: Have it in writing. No exceptions.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Mountain View at Topside Attic Insulation Mountain View, serving Mountain View and nearby areas.