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R-3.7 (open-cell) to R-7.0 (closed-cell) per inch
Spray Foam Insulation
Open-cell and closed-cell polyurethane foam that air-seals and insulates in one application.
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St. Johns County · North Florida
Insulation Contractor in St. Johns, FL
Spray foam, blown-in, batt, Fi-Foil, radiant barrier, and insulation removal for St. Johns homes, businesses, and industrial buildings. Licensed, insured, and open 24/7.
- Serving all of St. Johns
- Free written estimates
- Open 24/7
- Licensed & insured
If you own a home or a building in St. Johns, your insulation is doing more work than almost anything else in the structure — and in most St. Johns buildings we assess, it is not doing it well. St. Johns sits in North Florida, in St. Johns County, where summer attic temperatures routinely climb past 130 degrees and the air outside is carrying enough moisture that every gap in your ceiling plane is pumping humidity into your living space.
Where your ductwork lives changes the whole plan
In a large share of St. Johns homes, the air handler and the entire duct system sit in a vented attic that hits 135 degrees in August. That means every foot of duct is losing capacity, and any leakage in the supply side is dumping conditioned air into an attic while the return side pulls superheated, humid attic air into your house.
When we find that situation in St. Johns, the conversation usually turns to either a radiant barrier plus a heavy attic top-up, or a closed-cell spray foam roof deck encapsulation that brings the entire attic — ducts and all — inside the conditioned envelope. The second option costs more and does more.
Storm damage and insulation removal in St. Johns
St. Johns sits in a part of Florida where roof damage from a named storm is a question of when, not if. The pattern after every event is the same: water gets in through compromised roofing, saturates the attic insulation, and the property owner doesn't discover it until ceiling stains appear or the smell starts three weeks later.
Wet insulation does not dry out in a Florida attic. It stays wet, it loses R-value permanently, it grows mold, and it holds odor. We do full vacuum extraction into sealed bags, sanitize the deck and framing, and install fresh material. If your St. Johns property took roof damage, have the attic looked at even if the ceiling looks fine.
New construction in St. Johns
For builders and general contractors working in St. Johns, we install to your approved Florida Energy Code compliance forms, provide submittals and certificates of insurance up front, and commit to schedule dates. Insulation sits between MEP rough-in and drywall — if we're late, everyone behind us is late, and we take that seriously.
We also build the envelope with the required blower door and duct leakage testing in mind rather than hoping it passes and scrambling if it doesn't.
All Services in St. Johns
Every Type of Insulation Available in St. Johns, FL
Residential, commercial, and industrial — the complete envelope under one contractor.
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R-2.2 to R-3.8 per inch depending on material and settled density
Blown-In Insulation
Loose-fill fiberglass or cellulose blown to a consistent depth across attic floors.
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R-11 to R-38 depending on thickness
Batt Insulation
Pre-cut fiberglass or mineral wool batts fitted between studs, joists, and trusses.
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System R-values from R-4.1 to R-11 depending on assembly and air space
Fi-Foil Insulation
Reflective foil radiant barrier and vapor-retarder systems engineered for the Southeast.
Learn about Fi-Foil Insulation☀️
Reduces attic heat gain by up to 40% (radiant barriers are rated by emissivity, not R-value)
Radiant Barrier Insulation
Foil-faced sheathing or stapled-up barrier installed against the underside of the roof deck.
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N/A — removal service
Insulation Removal
Complete vacuum extraction of contaminated, wet, rodent-damaged, or storm-damaged insulation.
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R-30 to R-49 recommended for Florida attics
Attic Insulation
Full attic systems: air sealing, baffles, deck or floor insulation, and depth verification.
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R-4.1 to R-21 depending on wall type
Wall Insulation
Cavity and masonry wall insulation for frame, block, and tilt-wall construction.
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R-13 to R-19 typical
Crawl Space Insulation
Encapsulation, vapor barriers, and sub-floor or perimeter wall insulation.
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R-15 to R-23 with STC ratings from 45 to 60+
Soundproofing Insulation
Acoustic mineral wool and dense fiberglass for STC-rated wall and ceiling assemblies.
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Specified per assembly
Thermal Insulation
Engineered thermal envelope systems for mechanical, process, and building applications.
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Rated by hourly fire resistance, typically 1 to 4 hours
Fireproofing & Fire-Rated Insulation
Mineral wool, intumescent, and fire-rated assemblies meeting Florida Building Code.
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R-10 to R-30 depending on system
Metal Building Insulation
Faced fiberglass blanket, banded liner systems, and closed-cell foam for pre-engineered steel.
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Per approved energy calculation
New Construction Insulation
Full-scope insulation packages coordinated with your build schedule and energy calcs.
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N/A — diagnostic service
Energy Audits & Blower Door Testing
Diagnostic assessment of envelope leakage, duct leakage, and insulation performance.
Learn about Energy Audits & Blower Door TestingProperty Types
Who We Serve in St. Johns
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Residential Insulation in St. Johns
Single-family homes, condos, townhomes, and multifamily. Retrofit and new construction.
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Commercial Insulation in St. Johns
Offices, retail, restaurants, hotels, medical, schools, and mixed-use buildings.
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Industrial Insulation in St. Johns
Warehouses, distribution centers, manufacturing, cold storage, hangars, and agricultural facilities.
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Insulation types in St. Johns
Every insulation type we install in St. Johns
Each one has its own St. Johns page with local pricing, Florida code requirements and FAQs.
St. Johns Insulation FAQs
How much does insulation cost in St. Johns, FL?
Most St. Johns attic insulation projects fall between $1.50 and $4.50 per square foot installed. A typical 2,000 sq ft St. Johns home runs roughly $2,200–$4,500 for a blown-in top-up to R-38, and $6,000–$13,000 for a full closed-cell spray foam roof deck encapsulation. Insulation removal adds about $1.00–$2.00 per square foot. Standard Insulation gives free, written, itemized estimates throughout St. Johns and St. Johns County — call (561) 975-6204.
What R-value do I need in a St. Johns attic?
St. Johns falls in Florida Climate Zone 2 under the Florida Building Code, Energy Conservation (8th Edition). That means R-38 minimum for attics, with R-49 being the practical target for real comfort and utility savings. Many St. Johns homes built before 2005 are still measuring R-11 to R-19, which is a large part of why their summer bills are so high.
Do you offer spray foam insulation in St. Johns?
Yes. We install both open-cell and closed-cell spray foam throughout St. Johns, St. Johns County. Closed-cell on the roof deck is the strongest option here — it air seals, controls humidity, brings your ducts into conditioned space, and adds measurable uplift resistance to your roof sheathing, which matters in a hurricane-exposed part of Florida.
How fast can you get to St. Johns?
We answer the phone 24 hours a day, 7 days a week. In St. Johns County we can usually be on site for a free assessment within 24 to 48 hours, and emergency insulation removal after a roof leak or storm gets same-day priority whenever we can make it happen.
Do you handle commercial insulation in St. Johns?
Yes — offices, retail, restaurants, hotels, medical, warehouses, distribution, manufacturing, and cold storage throughout St. Johns and St. Johns County. We carry envelope, mechanical, and fire-rated scopes, and we work nights and weekends in occupied buildings with containment and HEPA filtration.
Are you licensed and insured to work in St. Johns?
Yes. Standard Insulation is a licensed Florida insulation contractor carrying general liability and workers' compensation coverage, and we work throughout St. Johns and all of St. Johns County. Certificates of insurance are provided to homeowners, general contractors, and property managers on request before any work begins.
Can insulation lower my electric bill in St. Johns?
Cooling is roughly half of a typical St. Johns electric bill. Bringing an under-insulated attic from R-11 up to a properly air-sealed R-38 commonly cuts the cooling portion by 20 to 30 percent — and more if your ductwork is in the attic and we add a radiant barrier. On a $300 summer bill that's usually $30 to $45 a month back in your pocket.
What is the best insulation for a St. Johns home?
It depends on your building and your budget, and we'll tell you honestly which one applies. If your attic is at R-13 and you want the most improvement per dollar, blown-in fiberglass to R-38 with proper air sealing is the answer. If your ducts are in the attic and you want humidity control and the biggest total comfort win, closed-cell spray foam on the roof deck is the answer. If your roof is more than twelve years old, do the roof first — we'll say so.
Free Insulation Estimate in St. Johns
No obligation, no charge. Call (561) 975-6204 — we're open 24/7.
Open 24/7 · 5827 Plunkett St, Hollywood, FL 33023 · bids@standard-insulation.com