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Serving Reno, NV and surrounding areas(775) 491-3183
Blown-in insulation slows heat conduction. Attic air sealing stops the much larger problem: conditioned air escaping through ceiling bypasses that no amount of insulation depth can fix. Every project is blower door tested before and after so you see the improvement in an actual number, not a contractor's word.
Attic air sealing in Reno targets the gaps and penetrations in your ceiling plane where conditioned air escapes by stack pressure into the attic above — most projects are completed in a single visit, and the documented CFM50 reduction from a post-work blower door test gives you a concrete measure of the improvement.
The mechanism at work is stack effect: warm air inside your home is less dense than cold outside air, so it rises and pushes outward through any gap it can find near the top of the building. In a typical Reno home built before 1980, those gaps are substantial — open-top interior partition walls that run from the first floor straight into the attic, rough framing gaps around early recessed light cans, and plumbing stacks passing through the ceiling with inches of open space around them. The DOE's Building America program identifies attic air sealing as among the highest-impact single measures available for existing homes, and Reno's combination of cold winters, high-altitude wind events, and aging housing stock makes the payoff particularly large here.
Attic air sealing is distinct from whole-house air sealing — though the two pair naturally. A full air sealing services scope extends the same treatment to rim joists, mechanical penetrations, and exterior wall bypasses. Once the ceiling plane is sealed, attic insulation added on top performs at its rated R-value rather than the reduced effective value it achieves when air is moving freely beneath it. The sequence matters: insulation first, sealing second, is the most common and expensive mistake homeowners make when they try to address these two problems separately.
When your heating bill climbs every January despite a thermostat you have not changed, stack effect is the likely culprit. Warm air rises through open partition tops and unsealed penetrations into the attic, then escapes through roof venting — pulling cold replacement air in through every gap at floor level. Air sealing the ceiling plane breaks that chimney before it empties your heating budget.
If the second floor of a two-story Reno home is noticeably warmer in summer and colder in winter than the first floor, the upper ceiling is leaking conditioned air into the attic in large volumes. The imbalance is a direct symptom of pressure-driven air movement through ceiling bypasses that insulation alone does not address.
Fine dust accumulating on high surfaces, along ceiling-wall joints, or around air register covers is often attic air being drawn into the living space through stack effect pathways. Attic cavities in older Reno homes accumulate decades of fiberglass debris, particulate from pest activity, and fine dust from repeated disturbance — all of which migrate downward when the ceiling plane is not sealed.
Ice dams form when heat escaping through the attic floor warms the roof deck, melts snow above, and then refreezes at the cold eave overhang. In Reno, this typically points to a leaking ceiling plane rather than just inadequate insulation depth. Sealing the air bypasses reduces the heat flux through the roof assembly, addressing ice dams at the source rather than symptom.
Every attic air sealing project begins with a blower door test that measures the home's existing air leakage rate in CFM50 — cubic feet per minute at 50 Pascals of depressurization. That baseline number tells us how leaky the house actually is, where the pressure is escaping fastest, and what reduction target is realistic given the scope of the work. Nevada's adopted 2021 IECC sets a code target of 3 ACH50 for new residential construction; the blower door test shows exactly where existing homes stand relative to that standard.
The sealing work itself prioritizes the highest-volume bypass locations: open-top interior partition walls are capped with rigid foam board and spray foam; recessed light cans are enclosed with airtight covers or replaced with IC-rated airtight fixtures; plumbing stacks are sealed with two-component spray foam; and wiring chases are packed with fire-rated intumescent sealant where code requires it. Attic hatches and pull-down stair assemblies receive weatherstripped, insulated covers rated to match the surrounding ceiling R-value. The complete material selection — spray foam, rigid blocking, or caulk — is determined by penetration size, substrate type, and whether a fire-rated assembly is required.
A combustion safety assessment is conducted on any home with atmospheric-draft gas appliances before and after sealing, because tightening the envelope can reduce combustion air supply to furnaces and water heaters in ways that create carbon monoxide risk. This step is not optional — it is part of every scope we take on. Once air sealing is complete, the project can be paired with air sealing services for rim joists and wall penetrations, or with attic insulation topped up to the Climate Zone 5 R-49 requirement for new construction under the 2021 code. A final blower door test after all work is complete documents the CFM50 improvement in writing.
Targets open partition tops, recessed cans, plumbing penetrations, and wiring chases — the highest-volume leakage sites in most Reno homes — with spray foam, rigid blocking, and fire-rated caulk.
Weatherstripped, rigid-insulated cover installed on every attic access point, rated to the same R-value as the surrounding ceiling assembly.
Pre- and post-work CFM50 measurements that document the actual air leakage reduction — suitable for NV Energy rebate documentation and home sale energy disclosures.
Air sealing completed first in the correct sequence, followed by blown-in insulation to the required depth — one crew, one visit, code-compliant result.
Reno's position at 4,500 feet in the Truckee Meadows, classified as IECC Climate Zone 5B, means the city faces cold winters with sustained sub-freezing temperatures and hot, low-humidity summers — conditions that drive strong stack effect pressure through the building envelope in both heating and cooling seasons. The westerly winds that come off the Sierra Nevada and accelerate across the valley floor — the Washoe Zephyr — further increase the pressure differential across the ceiling plane, amplifying infiltration through every unsealed bypass in ways that calculations based on temperature difference alone would not predict.
The older housing stock concentrated in neighborhoods like Old Southwest, Newlands, and Cold Springs was built during an era when attic air sealing was not a recognized construction practice. These homes typically have open partition tops running to the attic, original recessed cans without airtight enclosures, and plumbing penetrations sealed only with pipe insulation that has long since compressed and separated. Lemmon Valley and Sparks share this housing profile across large residential tracts built in the 1960s and 1970s, where comprehensive attic air sealing can reduce whole-house air leakage by 30 to 50 percent in a single project visit.
Reno's rapid growth has also produced new construction in South Reno and Damonte Ranch that passed the required blower door inspection at the code threshold but performs marginally in the first heating season. A post-occupancy air sealing scope on these newer homes addresses construction bypasses that were covered before the final blower door test and are now buried under installed insulation.
Reach us by phone or through the estimate form. We respond within 1 business day and ask about your home's age, attic access, and any specific symptoms — high bills, uneven temperatures, or visible dust patterns — that help us scope the work before we arrive.
A technician performs a pre-work blower door test to measure your home's baseline CFM50 air leakage rate, then photographs every penetration in the attic floor that requires treatment. The written estimate and materials list come from that inspection — no cost surprises after work begins.
Crew seals open partition tops with rigid foam blocking, fires spray foam around plumbing stacks, recessed cans, and wiring chases, and installs a weatherstripped insulated cover on the attic hatch. Combustion safety is assessed before and after sealing if the home has atmospheric-draft gas appliances.
A second blower door test after sealing documents the CFM50 reduction so you have a measurable number to compare against your utility bills. You receive a written summary of all penetrations sealed and the verified improvement — not a contractor's estimate, an actual measurement.
A blower door test before work begins gives you a real number — not a guess — so every dollar you spend on sealing goes to the bypasses that matter most. Request your no-obligation assessment today.
(775) 491-3183Most attic insulation contractors do not own or operate a blower door. We test before and after every air sealing project, giving you a documented CFM50 reduction that you can independently verify against your NV Energy bills — a number instead of a promise.
Working since 2019 in neighborhoods like Old Southwest, Newlands, and the University District means we have seen every version of the open partition top, early IC-rated can, and balloon-frame chase that concentrates in Reno's older residential core. We prioritize the bypasses that make the biggest CFM50 difference, not just the ones that are easiest to reach.
Attic air sealing in a home with atmospheric-draft gas appliances carries a genuine safety obligation. We perform a worst-case depressurization test before and after sealing to confirm that the furnace and water heater are not being starved of combustion air — a step that BPI certification requires and that many general contractors skip.
Nevada requires all contractors to hold a current Nevada State Contractors Board license under NRS Chapter 624. Ours is active and publicly verifiable — protecting your homeowner's insurance coverage and your eligibility for the state's Residential Recovery Fund if a dispute arises.
The Building Performance Institute certifies contractors in whole-house building science, blower door diagnostics, and combustion safety — skills that matter specifically in Reno where older homes with gas appliances and leaky attics create a situation where doing the insulation work right requires addressing the safety question first. The DOE Building America Measure Guideline for Attic Air Sealing establishes the sequence and material standards we follow on every project — a public document you can read and compare against what any contractor proposes.
Whole-house air sealing covering rim joists, wall penetrations, and mechanical bypasses beyond the attic floor — blower door tested for documented whole-building improvement.
Learn moreBlown-in, batt, and spray foam insulation for attic floors and rafter bays — installed after air sealing is complete so the insulation performs at its rated R-value.
Learn moreA blower door test before and after sealing shows you exactly how much improvement your Reno home gets — schedule yours before the next heating season.