An attic that leaks air will undo good insulation, which is why the order of the work matters more than the brand of material that goes in. This page covers what a professional actually looks for up there — air leaks, R-value, ventilation, and moisture — so you can tell a thorough scope from a quick top-up. When you're ready, ENTER SIX matches you with one vetted, insured professional in your area, licensed where required, and you approve the price before any work begins.
Insulation slows heat moving through materials. It does very little to stop air moving through gaps. Warm indoor air rises, escapes through openings at the top of the house, and pulls cold air in down low, so blowing new insulation over unsealed holes mostly hides them.
A thorough professional seals first. The usual targets:
If a quote jumps straight to depth and R-value with no mention of sealing, ask what's being sealed and how.
R-value measures resistance to heat flow. Higher is better, and layers add up: an existing R-30 with R-19 blown on top is roughly R-49. That "roughly" matters, because R-value is measured in a lab and real attics have compressed spots, thin edges at the eaves, and framing that lets heat bypass the insulation entirely.
For attics in Seattle, Portland, Boise, and most of New Jersey, current federal guidance sits in the R-49 to R-60 range, and local code sets the minimum. Two practical points: the gains taper off, so R-11 to R-30 is a much bigger change than R-49 to R-60, and depth in inches is what you can actually verify. Ask what you have now, what you'll have after, and how deep that is.
Most of the evidence shows up inside the house, before anyone opens the hatch:
Blown-in insulation — loose-fill fiberglass or cellulose — is what most attic upgrades use. It flows around framing, wiring, and awkward angles, and it can go over existing material without disturbing it. In a tight or cut-up attic, it's usually the practical choice.
Batts are pre-cut rolls or panels. They work well in open, evenly framed attics and where a professional needs to hand-fit around an obstacle. Their weakness is installation: a batt that's compressed, gapped, or notched sloppily around a wire loses a real share of its rated value.
Plenty of jobs use both — loose-fill across the flat attic floor, hand-fit or dense-packed material at knee walls and sloped ceilings. Coverage matters more than material: even depth, carried right out to the eaves, without blocking the vents.
Insulation and attic ventilation work as a pair. Insulation keeps the attic cold in winter; ventilation carries off the moisture that gets up there anyway. Bury the soffit vents under fresh insulation and you trade a heating problem for condensation, damp sheathing, and mold — which moves fast in the wet Seattle and Portland months.
Ask how the professional will handle:
If the attic is already wet, the source gets fixed first.
Spring and early fall are the easiest windows to book. Attics get dangerously hot by mid-morning in summer, and schedules tighten quickly after the first cold snap in Boise and New Jersey, or the first stretch of heavy rain in Seattle and Portland.
What moves the price: attic square footage and roof pitch, how accessible the space is, how much air sealing is involved, whether old insulation has to be removed and disposed of, ventilation corrections, and any wiring or moisture issues found during the inspection.
Utility and state weatherization or home-performance rebates may be available in all four of our markets. Two things worth knowing: many programs require pre-approval or a participating professional, and starting work first can disqualify you. Ask before anything is scheduled, and confirm the current rules with the program directly.
Usually not. If the existing layer is dry, reasonably even, and clean, new material can go right over it and you keep the R-value you already paid for. Removal is warranted when insulation is wet or water-stained, has rodent droppings or nesting, carries smoke odor, or sits over active knob-and-tube wiring. Removal adds labor, containment, and disposal, so ask the professional to show you photos of what they found in the attic before you agree to it.
It depends on what's up there and what's leaking. Six inches of settled material with no air sealing leaves a lot on the table. Deep, even coverage with sealed penetrations already does most of the work, and adding more gives you little. A real inspection tells you which situation you're in — the professional should measure depth in several spots, check the eaves and the hatch, and look for gaps around penetrations rather than quote from the attic opening.
It can, if ventilation and combustion safety get ignored. Blocked soffit vents trap moisture against the roof deck. And if you have a gas water heater or furnace with an atmospheric vent, sealing the house tighter means someone should confirm it still drafts properly. Ask how the vents will be kept clear, whether baffles are included, and whether any combustion appliance is affected. Done correctly, a sealed and insulated attic runs drier than the one you started with.
No. ENTER SIX is an advertising and referral company. We match your request with one independent, vetted, insured professional serving your area — licensed where required — and we verify required licenses in the applicable public contractor registry, where available. That professional performs the inspection and the work, gives you the price, and nothing starts until you approve it. Your request goes to one professional, never a list of numbers, and you choose when the callback comes.
One request. One professional. Never a lead list. You choose when we call.
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