Fast, Reliable Spray Foam Insulation Across Highland
Spray foam insulation in Highland, CA typically costs $2,800 to $7,500 for a full attic application, with roof deck projects running $4,200 to $9,800 depending on square footage and foam type. Most Highland homes we service are done in one to two days. If you’re dealing with a 120°F attic in August or rooms that never cool down in the afternoon, call us at (866) 950-6425 for a free estimate.
We spend our working days in Highland attics, crawlspaces, and wall cavities. We know Cypress Street ranches built in the 1970s as well as we know the newer developments near Greenspot Road. The heat out here isn’t like coastal heat. It sits on your roof for six months straight, and if your attic insulation was installed decades ago, it’s not doing what you think it is.
Why Riverstone Insulation Is Highland’s Preferred Spray Foam Insulation Company
Highland homeowners call us because we diagnose before we recommend. We carry eight insulation brands, including Icynene and Demilec spray foam systems, so our recommendation is driven by what your house actually needs, not what’s easiest for us to stock. When we walk into a mid-century ranch off Baseline Street, we’re looking at attic depth, venting setup, duct condition, and sun exposure before we suggest a single material.
Nate Dillard leads our crew. He’s the person who makes the final call on open-cell versus closed-cell for each Highland home, and he’s particular about the details: foam depth, sealing around attic penetrations, making sure the roof deck can handle the thermal shift. Our insulation-only focus means every truck, every estimator, and every installer on your property is there for one trade. Insulation is all we do.
We’ve worked extensively in the 92346 zip code. We know the neighborhood layouts, the typical attic configurations, and the common problem spots that show up on older tract homes. That local familiarity means we can give you an accurate estimate faster and avoid surprises mid-project.
Spray Foam Attic Insulation in Highland
Spray Foam Attic Insulation in Highland homes is the single most effective upgrade for a house where the upstairs runs 10 to 15 degrees warmer than the downstairs in summer. We apply closed-cell or open-cell foam directly to the underside of the roof deck, converting a vented, 120°F attic into a conditioned, sealed space that stops heat before it ever reaches your living areas. In Highland’s climate, attic roof deck applications run $4,200 to $9,800 on average.
Highland’s summer sun is relentless. An uninsulated attic can hit 130°F by 2 p.m. in July, and that heat radiates downward through your ceiling for hours after the sun sets. Spray foam breaks that cycle. Our team at Spray Foam Insulation has installed foam in attics across the Inland Empire, but Highland’s specific conditions – intense solar load, older vented attics, dry Santa Ana winters – require a different approach than you’d use closer to the coast.
Open-Cell for Interior Roof Decks
Open-cell foam is the workhorse for most Highland attic roof deck applications. It expands to fill every gap around rafters, electrical penetrations, and odd angles that batts simply can’t cover. In Highland’s dry climate, open-cell performs well because humidity levels stay low enough that we don’t see the moisture absorption issues that coastal installers have to manage. Typical attic roof deck projects with open-cell run $4,200 to $6,800.
Closed-Cell for Extra R-Value and Air Sealing
Closed-cell foam gives you roughly double the R-value per inch of open-cell, which matters when you’re working with shallow rafter bays on older ranch homes. We see a lot of 2×6 roof framing in Highland’s 1960s and 70s builds, where closed-cell is the better choice to hit an R-30 or higher without furring out the rafters. Expect closed-cell attic applications to run $5,500 to $9,800 depending on depth and square footage.
Spray Foam Wall Insulation in Highland
Spray Foam Wall Insulation in Highland’s older ranch homes solves a problem that batt insulation never could: the thermal bridging and air gaps that let outdoor heat push through exterior walls all afternoon. We inject or apply foam into existing wall cavities, filling the space completely and creating an air seal that stops both heat and the fine dust that Santa Ana winds push into homes through wall penetrations. Wall cavity applications in Highland typically run $1,800 to $4,500 for a standard exterior wall set.
Many Highland homes we inspect along Church Street and the surrounding tracts are built with minimal wall insulation by today’s standards. The 1970s-era fiberglass in those walls has compacted, leaving voids at the top of each stud bay. Spray foam fills those voids entirely and bonds to the sheathing, so there’s no air movement through the wall assembly. That’s a meaningful difference in a climate where afternoons regularly exceed 100°F.
Injection for Finished Walls
If your plaster or drywall is in good shape, we can inject foam through small access holes rather than tearing open the wall. This is a frequent request from Highland homeowners who love their 1960s ranch aesthetic and don’t want to redo interior finishes. Holes are patched cleanly, and the improvement in room temperature stability is noticeable within days.
New Construction and Remodels
For additions, garage conversions, or full remodels in Highland, we apply foam before sheetrock goes up. Builders and contractors around San Bernardino and Redlands work with us because we can spec the right product based on the wall assembly – open-cell for interior sound dampening, closed-cell for an exterior wall that faces hard afternoon sun.
Trusted Brands We Service in Highland
We install Icynene and Demilec spray foam systems because both brands have decades of field-testing in hot-climate residential applications. Icynene open-cell is our go-to for attic roof decks where air sealing matters more than maximum R-value per inch. Demilec closed-cell handles shallow cavities, high-moisture areas, and any application where structural rigidity adds benefit. We also offer GreenFiber cellulose for walls and CertainTeed batt products when a hybrid approach makes sense. Our Highland customers get a material-matched recommendation, not whatever happens to be on the warehouse shelf.
Common Spray Foam Insulation Problems We See in Highland Homes
- Foam applied too thin on attic roof decks. In Highland’s summer, a thin coat doesn’t block enough radiant heat, and the foam’s surface temperature climbs until the attic feels nearly as hot as it did before. We spec minimum depth based on rafter bay dimensions and sun-facing roof orientation.
- Spray foam over settled batts without addressing duct leaks. We constantly see this in 1970s ranches near Cypress Street. The foam seals the roof, but old batts and cracked duct insulation below the foam still allow 120°F attic air into the living space through gaps and bypasses.
- Poorly sealed foam edges around attic penetrations. During Santa Ana wind events, negative pressure in the attic pulls cold outside air through any unsealed penetration edges. That air hits warm surfaces, creates condensation, and can lead to mold or reduced foam performance over time.
- Skylight and can-light perimeters left unsealed. Highland’s older homes have often had skylights or recessed lighting added over the years, and each one creates a pathway for heat. We seal and foam every penetration as part of the job, which many non-specialist installers skip.
Pricing for Spray Foam Insulation in Highland, CA
A full spray foam attic roof deck application in Highland runs $4,200 to $9,800, with the final number depending on square footage, rafter depth, whether we’re removing old insulation first, and open-cell versus closed-cell selection. Wall cavity injection runs $1,800 to $4,500 for a typical single-story exterior. Rim joist sealing, which matters a lot in Highland’s winter cold snaps, runs $900 to $1,800 per crawlspace. These are what we actually quote for homes across the 92346 zip code, not generic national averages. Call (866) 950-6425 and we’ll give you a detailed number after we see your attic and walls. Estimates are free.
We Also Serve Cities Near Highland
While this page talks about Highland specifically, our crews regularly run insulation jobs in San Bernardino, Muscoy, Redlands, and Loma Linda. If you’re in one of those areas and dealing with the same Inland Empire heat, the material-matching approach doesn’t change. We’ll assess your specific home and recommend from the same eight-brand portfolio.
Serving Highland, CA — Our Local Coverage Area
We’re based in the Highland area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About Spray Foam Insulation in Highland
Yes. Spray foam applied to the underside of the roof deck turns your attic into a conditioned barrier, stopping radiant heat from the sun before it enters the attic airspace. Highland attics routinely exceed 120°F with old batt insulation, but a properly specced foam application keeps the attic within 10 to 15 degrees of the living space. That difference is what stops your upstairs rooms from feeling like ovens at 5 p.m. Call (866) 950-6425 and we’ll tell you exactly what your roof deck can handle.
Yes, in most cases you should. Settled batts lose nearly all their thermal performance, and leaving them in place creates air gaps between the foam and the ceiling that let heat bypass the insulation. We remove the degraded material, air-seal the attic floor, then apply foam to the roof deck or ceiling plane. It costs more upfront but it’s the difference between a fix that works and one that just looks good from the hatch opening.
Spray foam holds up well against Santa Ana winds as long as every penetration edge is fully sealed. The winds create negative pressure that pulls outside air through any gap around plumbing vents, electrical boxes, or recessed lights. We seal those edges as part of every Highland install, which prevents condensation issues during winter cold snaps. A properly installed foam job has no air leaks to exploit.
Yes, and it’s typically the most direct lever you can pull. Highland homes with original 1970s attic insulation and leaky ducts often see the biggest utility reductions after foam because the AC stops fighting a constant influx of attic heat. You’ll likely notice lower afternoon runtime and more stable indoor temperatures within the first full billing cycle after installation. Call us at (866) 950-6425 for a realistic look at what your specific home can expect.
For most vented attics in Highland, we recommend removing the old insulation, air-sealing the attic floor, and applying open-cell Icynene foam to the roof deck to convert the space to a sealed, conditioned attic. Closed-cell Demilec is the better call when rafter bays are shallow or you want maximum R-value per inch plus structural reinforcement. The right answer depends on your roof framing, existing ventilation, and whether your ducts run through the attic.
On a 1970s ranch home off Cypress Street in Highland, our crew found settled fiberglass batts and heat-cracked duct insulation in the vented attic, leaving gaps where 120°F air leaked into living spaces. We removed the degraded batts, air-sealed the attic floor, and applied Icynene spray foam to the underside of the roof deck, then sealed the duct boots with mastic. The homeowner reported a noticeable drop in afternoon utility spikes and quieter operation from the HVAC system.
Highland sits at the base of the San Bernardino Mountains in the hot, dry Inland Empire, where summer attic temperatures routinely spike well above 120°F. Insulation here is judged as much by heat rejection and solar load handling as by R-value. Unlike coastal homes that rarely see extreme attic temps, Highland homes face brutal dry summer heat for months at a stretch, followed by winter Santa Ana wind events that pull cold air through every small opening. That means attic and duct insulation is a year-round efficiency issue tied directly to your utility bills, not a one-season fix.
If you’re ready to figure out what’s actually happening in your Highland attic or walls, call (866) 950-6425 for a free estimate. We’ll walk the attic with you, measure the real numbers, and give you a straight answer about what’s worth doing and what isn’t.
Written by Nate Dillard, Owner at Riverstone Insulation, serving Highland and the greater Inland Empire.