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Serving Portsmouth, NH and surrounding areas. (603) 956-1359
Gaps in your attic floor let expensive heat escape and cold drafts back in. We find every opening and seal it - so your home stays warm and your bills come down.
Attic air sealing in Portsmouth, NH means finding and plugging every gap, crack, and penetration in your attic floor that lets heated air escape - most jobs take one full day, and you can stay in your home the entire time.
Most Portsmouth homeowners assume adding more insulation is the answer to high heating bills. But insulation slows heat movement - it does not stop air from blowing through gaps around light fixtures, plumbing pipes, and the tops of interior walls. Sealing those gaps first is what actually makes the difference. Many older homes in Portsmouth have never had this done.
If you are also thinking about upgrading the insulation itself, our retrofit insulation service pairs well with air sealing for the best overall result.
If your gas or electric bills spike every November and stay high through March, air leakage is one of the most common causes. Heat rises and escapes through any gap it can find in your attic floor. Portsmouth winters are long, so this problem compounds quickly - every degree of heat that escapes is heat you paid for but never felt.
Thick ridges of ice forming at the edge of your roof after snowfall are a direct sign that warm air is escaping through attic gaps and heating the roof unevenly. Snow melts, runs down, then refreezes at the cold eaves. Left unaddressed, ice dams push water back under shingles and into your ceilings and walls.
If an upstairs bedroom stays cold no matter how high you turn the thermostat, uneven temperatures are a classic sign of air leakage from above. Cold attic air can settle into upper-floor rooms through gaps around light fixtures, ceiling fans, and the tops of interior walls - especially common in Portsmouth's pre-1960 homes.
Dust rings forming around recessed lights or ceiling fan housings are a visible sign that air is moving through gaps in your ceiling - pulling attic air, dust, and particles down into your living space. A musty or stale smell in upper-floor rooms can also indicate that attic air is mixing with your indoor air through those same openings.
We seal every penetration in your attic floor - plumbing pipes, electrical wires, chimney chases, recessed light fixtures, and the tops of all interior walls. We use spray foam and caulk to create a tight, durable seal at each opening, then carefully replace any insulation we moved during the process. For homes with existing insulation that has shifted or settled, we can address that as part of the same visit. We also pair air sealing with our attic insulation service when homeowners want to tackle both in a single project.
If you have older insulation that is deteriorated, contaminated, or simply not performing, our team can remove it first and start fresh. We work on all types of attic configurations common in Portsmouth - from open attics with pull-down stairs to tight kneewall spaces and finished attics with complex framing. Every job ends with a walkthrough so you can see exactly what was sealed and where.
Best for homeowners who want to stop heat loss and reduce ice dams without replacing existing insulation - we seal the gaps and leave the insulation in place.
Best for homeowners whose existing insulation is thin, old, or damaged - we seal first, then add or replace insulation for maximum performance.
Best for Cape Cods and homes with partial finished attics, where kneewalls and sloped ceilings create hard-to-reach air leak zones that most contractors skip.
Best for homeowners looking to offset costs - we handle the documentation so you can access NHSaves rebates after the work is complete.
Portsmouth sits in a climate zone where winter temperatures regularly drop into the single digits. When it is that cold outside, warm air inside your home is under constant pressure to escape - and it finds every gap in your attic floor to do it. Portsmouth also has one of the oldest housing stocks in New England, with many homes dating to the 1800s and early 1900s. These homes were never built with air sealing in mind, and decades of settling, renovation, and added plumbing and electrical work have created additional gaps over time. Ice dams are a real and recurring problem here for exactly this reason.
Portsmouth's coastal location along the Piscataqua River also means humidity levels are higher than in inland communities. When warm, moist indoor air escapes into a cold attic through unsealed gaps, it can condense on cold surfaces and create conditions for mold and wood rot. We serve homeowners across the area, including Hampton and Exeter, where many of the same older-home challenges apply.
We ask a few quick questions - your home's age, attic size, and what's been prompting the call. We reply within one business day and can typically schedule an in-home assessment within one to two weeks.
We inspect your attic directly - looking at existing insulation, identifying penetrations, and noting how accessible the attic floor is. Many assessments include a diagnostic measurement of your home's overall air leakage. You receive a written estimate before any commitment.
The crew accesses the attic, carefully moves existing insulation aside, and works systematically across the floor - sealing every gap with foam or caulk. This includes hard-to-reach spots like the tops of interior walls and around recessed lights. The work typically takes one full day.
Before we leave, we walk you through everything that was sealed. If you are applying for a NHSaves rebate, we provide the documentation you need. The sealing is effective immediately - there is no waiting period.
Free estimate, no obligation. We reply within one business day.
(603) 956-1359Portsmouth's pre-1940 housing stock presents sealing challenges that newer construction does not - balloon framing, plaster ceilings, and generations of added plumbing and wiring. We have worked on enough of these homes to know where the gaps hide and how to reach them safely without damaging original finishes.
We are enrolled in the NHSaves program, which means our work qualifies for state rebates. We provide all the documentation you need to submit your claim - so you are not leaving money on the table.
Poor air sealing jobs skip hard-to-reach areas like the tops of interior walls and spots behind knee walls. We seal every penetration on the attic floor - not just the obvious ones. After the job, you can see exactly what was done because we walk you through it before we leave.
We follow Building Performance Institute standards for home energy performance. That means we assess your home as a system - not just the attic in isolation - so the work we do addresses real problems rather than guessing.
Every one of these points matters when you are hiring someone to work inside your home. We combine local knowledge, program enrollment, and a thorough process so you can feel confident the job was done right.
Add insulation to your existing home without a gut renovation - the logical next step after air sealing to maximize comfort and energy savings.
Learn MoreUpgrade the insulation layer in your attic to work in combination with sealed air gaps for year-round performance.
Learn MorePortsmouth winters arrive fast - book your free estimate now and make sure your home is sealed and ready before the cold snaps hit.