1966 Rancher Gets a Full Attic Overhaul: 32% Less Air Leakage, $1,876 in PEPCO Rebates
A Silver Spring homeowner wanted their first floor comfortable year-round. Here's exactly what we found, what we did, and what it cost after rebates.
Schedule a $100 Energy AuditProject at a Glance
About This Home
1966 Silver Spring Rancher — Home Profile
Why This Homeowner Called
The complaint was specific: the first floor never felt comfortable, regardless of what the thermostat was set to. Too cold in winter. Too warm in summer. The HVAC system was running, but the house wasn't responding the way it should.
Before committing to a full attic project, the homeowner wanted a second set of eyes — a contractor who could walk through the scope and confirm that the work being proposed was the right work, done the right way. That's a smart way to approach a major home investment, and it's a conversation we welcome.
After reviewing the situation, the plan was clear: full insulation removal, comprehensive air sealing, and a fresh R-49 installation — done correctly from the attic floor up. If you haven't had an audit yet, our $100 energy audit is the right first step before committing to any scope of work.
What Happens If You Leave It
- HVAC runs harder and longer than it should, shortening equipment lifespan and increasing monthly bills
- First-floor comfort problems persist regardless of thermostat setting — the root cause is in the attic, not the equipment
- Bathroom fans venting into the attic dump warm, moist air into a closed space — over time, a perfect environment for mold and roof deck damage
- Homeowners often make the wrong fix first: new HVAC, new windows, new thermostats — spending thousands without solving the problem because no one looked at the attic
The Work — Step by Step
1 Protecting the Home Before We Start
Before a single piece of old insulation came out, we set up a ZipWall plastic containment barrier at the attic entrance to fully isolate the work area from the rest of the home. Floor protection mats were laid from the front door to the attic access point.
Insulation removal generates significant dust and debris. This containment setup is standard practice on every Leonard Home Performance removal job — your home should be as clean when we leave as when we arrived.
2 Full Insulation Removal
Both the existing fiberglass batts and the blown-in insulation were completely removed. This is the step that contractors who cut corners tend to skip — they'll blow new insulation on top of old, saving time but leaving the unsealed attic floor inaccessible underneath.
Partial removal limits what's possible. If the attic floor isn't fully exposed, you can't seal it. And if you can't seal it, the insulation you install on top is doing half the job it should. Boards covering sections of the attic floor were lifted to ensure every area was accessible.
Is your Silver Spring home's first floor harder to heat or cool than it should be? The problem is almost certainly in the attic.
Book Your $100 Energy Audit3 Attic Air Sealing
With the attic floor fully exposed, every penetration was sealed:
- Top plates — the gaps where interior walls meet the attic floor, each one a direct pathway for warm air to escape into the attic
- Plumbing and electrical penetrations — every pipe and wire hole sealed with spray foam
- Recessed lights — each can was capped with an airtight cover and sealed. Flags were placed at every recessed light and junction box, permanently marking their locations through the new insulation so nothing has to be guessed at future maintenance
This step — air sealing before insulation — is what produces the 32% improvement in air leakage. Insulation slows heat transfer through surfaces; air sealing stops the uncontrolled air movement that insulation alone cannot address. Doing them in the wrong order, or skipping air sealing entirely, leaves the most important part of the job undone.
4 Bathroom Fan Rerouting & Replacement
During the inspection, both bathroom fans were found to be venting directly into the attic rather than to the outside. This is an extremely common problem in homes of this era — and a significant one. A bath fan that terminates in the attic dumps warm, humid air into an enclosed space every time it runs. Over time, that moisture accumulates in the insulation and wood framing, creating the conditions for mold growth and roof deck deterioration.
Both fans were rerouted to vent directly outside through the roof. One fan was also replaced entirely to ensure adequate ventilation capacity for the home.
5 Baffle Installation
Ventilation baffles were installed at the soffits before insulation was added. Baffles maintain a clear air channel between the insulation and the roof deck, allowing outside air to flow from the soffits toward the ridge — the proper ventilation path that keeps the roof deck dry and at a consistent temperature.
Without baffles, blown-in insulation can block the soffits and choke off airflow. In winter, that means moisture can accumulate under the roof. In summer, it can drive up attic temperatures significantly. Baffles are a small detail that protects the entire installation.
6 R-49 Fiberglass Insulation
Finally, blown-in fiberglass insulation was installed across the entire attic floor to a uniform depth of R-49. This meets Maryland's current energy code requirement and qualifies the project for PEPCO's Home Performance with ENERGY STAR rebate program.
Unlike batts, blown-in insulation fills every joist bay and irregular space completely — no gaps, no compression points, no areas where coverage drops short. Combined with the air sealing underneath, it creates a complete thermal boundary between the living space and the unconditioned attic above.
The Results
| Metric | Outcome |
|---|---|
| Air Leakage Reduction | 32% — confirmed by post-work blower door test |
| Insulation Level Achieved | R-49 — Maryland code requirement |
| PEPCO Rebate Secured | $1,876.50 — applied through Home Performance with ENERGY STAR |
| Rebate Paperwork | Handled entirely by Leonard Home Performance |
| Project Duration | Single day |
A 32% reduction in air leakage means nearly a third of the uncontrolled air exchange that was driving this home's comfort problems has been permanently eliminated. For a single-story rancher where every room sits directly below the attic, that improvement is felt immediately — the home now holds temperature the way it's supposed to.
The $1,876.50 in PEPCO rebates was secured through the Home Performance with ENERGY STAR program. As a PEPCO-approved contractor, Leonard Home Performance handled all paperwork — the homeowner didn't have to navigate the program independently. The remaining project cost may also qualify for 0% interest financing.
Is Your Silver Spring Home Due for an Attic Overhaul?
Silver Spring's housing stock is heavily concentrated in homes built between 1945 and 1975. Ranch-style homes from the late 1950s through late 1960s are especially common in neighborhoods like Four Corners, Woodside, Kemp Mill, Burnt Mills, and Colesville. These homes share a consistent profile:
- Original insulation that was never replaced, often supplemented at various points with blown-in additions that sit on top of unaddressed air leaks
- No air sealing — the concept didn't exist in residential construction when these homes were built
- Bathroom fans, if they were ever installed, frequently vent into the attic rather than outside
- Recessed lights added during mid-century renovations that punched uninsulated holes directly into the ceiling
If your Silver Spring home was built before 1980 and your first floor is harder to heat or cool than it should be — or your PEPCO bills don't match your comfort level — the attic is almost certainly the reason. The fix isn't a new HVAC system or new windows. It's what's underneath the insulation you already have.