Icynene Blown-In Insulation in Sunnyvale: What to Know First
Walt’s Insulation provides independent Icynene blown-in insulation service across Sunnyvale, from top-ups over settled spray foam to full dense-pack wall retrofits. Most Icynene blown-in jobs in Sunnyvale run $4,000 to $9,500 and finish in one to two days. We’re not a franchise and not affiliated with Icynene’s manufacturer, but we’ve worked on their products since the early 2000s and we know exactly how they behave in a South Bay attic. If you own a home with Icynene and need blown-in insulation done right, call (669) 215-4805 for a free estimate.
This page is for Sunnyvale homeowners who already have Icynene spray foam or are considering pairing Icynene with blown-in insulation. If you’re not sure what’s in your attic right now, we’ll tell you during the assessment.
Key Takeaways
- We’re an independent Icynene service provider, not an authorized dealer, so we can be honest about when Icynene is worth keeping and when it isn’t.
- Most Sunnyvale Icynene jobs involve topping up open-cell foam with blown-in fiberglass or cellulose, or dense-packing walls that were never insulated properly.
- Walt’s Insulation has served Sunnyvale homeowners for over 25 years, and every job carries our lifetime Done Right Promise.
- You’ll talk to a live person, 24/7. No voicemail, no answering service.
How Icynene Products Fail - and How We Fix Them
Icynene makes solid products, but every insulation brand has weak points. Here’s what we see on Sunnyvale Icynene jobs and what we do about it.
- Icynene Classic open-cell shrinkage in attic ceiling lines. Icynene Classic and Classic Max were open-cell formulas that could shrink slightly as they cured, especially if applied during cold weather. Over time this leaves a small gap at the framing line where air moves through. We’ve found this in ranch-style Sunnyvale homes built before 1995. Our fix is blown-in fiberglass top-up over the foam to close the gap, not another spray foam pass.
- Icynene ProSeal air-barrier gaps after settling. ProSeal is a closed-cell product, and it’s rare for it to fail on its own. But in Sunnyvale’s hot attics, plywood roof decking expands and contracts enough that the foam can separate from the deck at the eaves. We catch this during an attic assessment and fill the eaves with dense-pack cellulose, which the foam alone never handles well in corners.
- Rodent tunnels through open-cell Icynene. Rats and mice love tunneling through open-cell foam. In Sunnyvale neighborhoods with mature trees close to rooflines, this is a chronic issue. We remove the damaged foam, rodent-proof the entry points, and replace the insulation with blown-in fiberglass or cellulose. You may love Icynene; rats love it too. We fix both problems.
- Dense-pack wall retrofits over old Icynene. Some Sunnyvale homes got Icynene sprayed into a few wall cavities years ago, usually around additions or garage conversions, while the rest of the walls were left uninsulated. We dense-pack the remaining cavities with fiberglass or cellulose at 3.5 to 4 pounds per cubic foot. That matches the air-sealing performance of the Icynene cavities without tearing out drywall.
- Water-damaged Icynene from roof leaks. Closed-cell ProSeal resists water, but open-cell Classic soaks it up like a sponge. By the time a Sunnyvale homeowner notices a ceiling stain, we frequently find the foam has been holding water against the framing for weeks. We pull the foam, dry the decking, fix the leak source, and rebuild the insulation with blown-in material. That’s a case where replacing Icynene is the right call, not patching it.
Our Icynene Blown-In Insulation Process
Here’s how a real Icynene job goes from call to cleanup.
- 1
You call, a person answers. Not a call tree. We ask about your house, your Icynene situation, and what you’re noticing. We’ll schedule an assessment at a time that works for you.
- 2
We assess the insulation and take photos. A background-checked, uniformed technician shows up and goes into the attic and crawl space before recommending anything. This is where we figure out which Icynene product you have and what’s actually wrong.
- 3
You get a written quote with upfront pricing. No vague numbers. We’ll show you what it costs, what material we recommend and why, and what the job involves.
- 4
We do the work. That means prepping the space, running the blower, hitting the target depth and density, and cleaning up any mess. If we’re topping up Icynene, we don’t disturb the foam unless it’s damaged.
- 5
We check our work against the spec. Depth markers, density checks on dense-pack, thermal camera where it helps. We don’t leave until we’re confident the job is right.
- 6
You’re covered by the Done Right Promise. Lifetime workmanship. If it’s not done right, we make it right. No runaround.
What Icynene Blown-In Insulation Costs in Sunnyvale
Most Icynene blown-in jobs in Sunnyvale fall between $4,000 and $9,500, depending on scope. A simple top-up runs lower; a full removal and replacement after water or rodent damage runs higher.
| Job Type | Typical Range (Sunnyvale) |
|---|---|
| Blown-in top-up over existing Icynene | $2,800 – $4,200 |
| Dense-pack wall retrofit (whole house) | $5,000 – $9,500 |
| Remove water-damaged Icynene, re-insulate with blown-in | $4,500 – $8,000 |
| Blown-in cellulose or fiberglass over old Icynene (attic) | $3,200 – $5,500 |
What moves the price: square footage, how much of the old Icynene is damaged, access (tight attics and low crawl spaces take longer), and whether we’re dealing with rodent cleanup or water damage. Call (669) 215-4805 for an exact quote; estimates are free, and there’s no trip charge inside our service county.
Why Sunnyvale Homeowners Call Walt’s Insulation for Icynene Work
We’ve been doing this since 2000, and Walt Brenner built the company on a simple idea: a local business with a real address, a real license number, and a real person who answers the phone. When you call us, you get a live person, 24/7. Not an answering service. Not a national call center.
Our technicians are background-checked and uniformed, and we back every job with our lifetime Done Right Promise. If the work isn’t right, we fix it. That’s the guarantee, in plain English. We work with brands including Owens Corning, Rockwool, Johns Manville, CertainTeed, and Icynene, and we also service Reflectix products, so if you’ve got a mix of materials in your Sunnyvale home, we can handle it. As Walt likes to say, “Good insulation should be invisible - you only notice it when it’s missing.”
Frequently Asked Questions
Yes. We frequently top up Icynene open-cell foam with blown-in fiberglass or cellulose to reach R-38 or higher in Sunnyvale attics. The Icynene stays in place; we add the blown-in material on top and around it.
They serve different jobs. Icynene’s strength is air sealing; blown-in insulation’s strength is filling irregular cavities and getting to target R-value affordably. In many Sunnyvale homes, the best answer is both: Icynene where it made sense, and blown-in where it didn’t. We’ll help you figure out which is right for your situation without pushing one or the other.
Our standard assessment scheduling is within a few business days, and emergency cases like water damage get priority. Call (669) 215-4805 and a live person will get you scheduled.
Icynene’s manufacturer warranty covers the material itself. Our work is covered by our lifetime Done Right Promise, and we work in a way that doesn’t void your manufacturer warranty. If we have to remove and replace Icynene, we’ll be straight with you about what’s covered by whom.
It depends on how much of it is damaged. If the Icynene is structurally sound, topping it up with blown-in insulation usually costs less than a full replacement. If it’s wet, moldy, or rodent-tunneled, replacement is usually cheaper in the long run because you’re not going to keep patching a failing system. We’ll give you one honest recommendation, not a sales pitch.
Call (669) 215-4805 today for a free estimate on Icynene blown-in insulation in Sunnyvale. You’ll get a real person, an honest answer, and a price before we do any work.
Written by Walt Brenner, Owner, Walt’s Insulation at Walt’s Insulation, serving Sunnyvale and nearby areas.