Insulation blower rental, and the ten bag rule
By Insulation Report Editorial. Last reviewed August 2026. How we research this.
In brief
For a whole attic, the machine is free. Both big retailers hand over a blower for a day when you buy ten bags of loose-fill, and neither posts a paid daily rate on the rental listing. The Home Depot states the term twice, once for cellulose and once for Owens Corning AttiCat fiberglass.
Lowe's states it for AttiCat. So the money question is not what the machine costs. It is whether your attic needs ten bags. One bag of AttiCat covers 39.5 square feet at R-49, so ten bags reach about 395 square feet. Any attic bigger than that clears the threshold on material it was buying anyway.
A small top-up over part of an attic may not, and no price is published for that case. The machine on the listing moves 450 lb an hour through 100 feet of hose, weighs 165 lb, and runs at 85 dB. Wear hearing protection.
Most pages about renting a blower open with a daily rate. Neither retailer publishes one. What both publish instead is a purchase threshold, and that is a better number anyway, because it ties the machine to the thing you already have to buy.
This page works the threshold out for your attic, then prices the two ways to get the job done. The material figures come from published coverage charts for two named products. The blown-in cost page builds the same arithmetic per square foot and per bag.
What the retailers publish, quoted
Three terms, read on 2026-08-11. Each is quoted as its retailer states it, and each sets the same ten bag threshold.
| Retailer | Material the term applies to | The term, as published |
|---|---|---|
| The Home Depot | cellulose loose-fill | “The first day's rental is free with the purchase of 10 bags of Cellulose loose-fill insulation.” |
| The Home Depot | Owens Corning AttiCat blown fiberglass | “Free 24 hour blower machine rental with the purchase of 10 bags.” |
| Lowe's | Owens Corning AttiCat blown fiberglass | “Free 24-Hour machine rental with purchase of 10 bags or more AttiCat.” |
Two things follow. The machine is free on any job that buys ten bags at one store. And the free day is tied to the material brand, so mixing a Lowe's machine with Home Depot bags is not what any of these terms describe.
What the machine is
Figures: Greenfiber cellulose insulation blower, rental model 118, as published on the rental listing, read 2026-08-11.
| Published figure | Value | What it means in your attic |
|---|---|---|
| Throughput | 450 lb per hour | About 18 of the 25 lb cellulose bags an hour, if somebody keeps the hopper full |
| Hose | 100 ft | The machine stays on the ground or in the driveway. The hose is your working radius, and it is shorter once it climbs |
| Weight | 165 lb | A two person lift into a vehicle, and a ramp or a tailgate rather than a straight carry |
| Noise | 85 dB | Loud enough that hearing protection belongs on the list. See the safety section below |
What the retailers do not publish
- A paid daily rate. Neither rental listing carries one, so no figure for renting without the ten bags appears on this page. Ask your own store.
- The deposit or card hold. A hold at the counter is normal on rented equipment and neither retailer states an amount. Bring a card and expect one.
- A throughput figure for the fiberglass machine. The 450 lb an hour above is off the cellulose machine's own listing. The AttiCat machine is a different machine and its rate is not posted, so none is given for it here.
- Late fees and the return clock. The term says a day, or 24 hours. What happens if you run long is store policy, not published policy.
What the job actually takes
Two people. That is not a preference, it is how the machine works. It sits outside or in the garage and the hose runs up through the hatch, so one person breaks bags open and feeds the hopper while the other holds the hose and watches the depth. Nothing feeds itself, and the person in the attic cannot see the hopper.
The published throughput is a machine rate, not a job rate. At 450 lb an hour, the 86 cellulose bags for the worked attic below are about 4.8 hours of blowing. The rest of the day is setup, hose runs, moving around the attic, the trip back, and cleanup. This site's cost model brackets a trained two person crew at 10.8 to 14.4 crew-hours for that attic, and that figure is an estimate from trade guidance rather than a measurement. A first attempt runs longer than a crew's day.
Do the preparation before the machine arrives, because the free day is a clock. Baffles at the eaves go in first, or loose material seals the intake vents you are relying on. Air sealing the ceiling plane happens before any depth goes over it, and it is slow hand work. Depth markers get stapled to the joists so you can see where you are. The installation guide sets the whole order out.
What a rented machine is not
It is a smaller machine than the one on a contractor truck, with less hose and a lower rate. That shows up in one place above all: the far corners. Where the hose is at full stretch and the roof is closing down onto the top plate, material lands thin and uneven, and depth at the eaves is the part of a blown attic most often short. Plan to work the perimeter first, while you still have hose to spare, and check depth there before you pack up.
Does your attic need ten bags?
Divide your attic floor area by what one bag covers at your target R-value. If the answer is ten or more, the machine costs nothing. The table gives the flip side: the attic area at which each material reaches ten bags.
Figures: coverage published by each maker. Fiberglass is Owens Corning AttiCat blown-in fiberglass, 27.5 lb bag, read 2026-08-07. Cellulose is the Greenfiber SANCTUARY 25 lb attic card, read 2026-08-11, which publishes two columns: a net figure, and a figure adjusted for 2x6 framing at 16 inch centers. The retail listing publishes one coverage figure, 48.8 sq ft, which is its R-19 framing-adjusted number. Attic coverage at higher R-values comes from the manufacturer attic card, not from the retailer.
| Target | Fiberglass, sq ft per bag | Ten bags cover | Cellulose, sq ft per bag | Ten bags cover | Fiberglass coverage basis |
|---|---|---|---|---|---|
| R-30 | 68.5 | 685 sq ft | 25.9 to 27.4 | 259 to 274 sq ft | Published point |
| R-38 | 52.8 | 528 sq ft | 19 to 19.9 | 190 to 199 sq ft | Worked out between published points |
| R-49 | 39.5 | 395 sq ft | 14.1 to 14.6 | 141 to 146 sq ft | Published point |
| R-60 | 31.8 | 318 sq ft | 11.6 to 12 | 116 to 120 sq ft | Published point |
Read the table the way a job actually runs. The deeper you go, the sooner the machine is free. A bag spread to R-60 covers barely half the floor it covers at R-30, so a deep attic buys more bags for the same area. And cellulose reaches ten bags on a much smaller attic than fiberglass, because each bag covers far less floor.
Most whole attics clear it easily. At R-49 the fiberglass threshold is about 395 square feet, well under the footprint of most houses. Targets here follow ENERGY STAR's recommended attic levels, which are R-30 in climate zone 1 and R-60 in zones 4 through 8 for a bare attic. Which target is yours works that out. Energy codes cover new building and work done under a permit. They do not usually cover adding insulation to an attic you already have. Which edition applies where you live depends on your state, and often on your city. Your local building department is the only authority on it.
Two cautions on the arithmetic. Bag counts are rounded up, because bags are sold whole and a hopper left empty at the far corner costs a second trip. And a coverage chart prices a bare ceiling, so if you are adding depth over material that is already there, the bag count is the difference between two rows rather than the target row. The calculator runs it on your own floor area.
The small job, where ten bags do not happen
The threshold fails on one shape of job: a shallow top-up over part of an attic. Say 300 square feet of bare ceiling over an addition, taken to R-30. At 68.5 square feet a bag that is about 4.4 bags, so 5 bought whole. Well under ten, and the free day does not apply. No paid rate is published, so the honest answer is that this page cannot price it and the rental desk can.
A depth top-up over a whole floor is different, and it clears the bar sooner than people expect. Taking 1,000 square feet from R-30 up to R-49 is the gap between two coverage rows, about 10.7 bags. That is over the threshold on its own. Adding over existing insulation covers when that is the right move.
For a genuinely small area, the machine is usually the wrong answer anyway. Bags of loose-fill can be broken up and spread by hand, badly but adequately, over a few hundred square feet. Batts cut to the joist bays do the same job with no machine and no second person. Blown-in against batts compares the two formats on the work rather than on the label.
Rent it, or hire it
One worked attic: 1,200 square feet taken to R-49, which is the ENERGY STAR retrofit target for a partly insulated attic in climate zones 4 through 8. The rental column carries no machine cost, because 31 bags clears the ten bag term.
Figures: Insulation Report Cost Model, August 2026. Wages are BLS OEWS May 2025 for SOC 47-2131. Material is at retail shelf price, read 2026-08-07. The hire column rests on a burden multiplier and a crew-hour range that are estimates, not measurements, so treat it as a bracket for checking a quote.
| Line | Rent and do it | Hire it out |
|---|---|---|
| The machine, one day | $0, with 10 bags | Included |
| Material, 31 bags of expanding fiberglass at retail | $2,095 | Included |
| Labor, 10.8 to 14.4 crew-hours (estimate) | Your own two days | Included |
| Respirator, sealed goggles, hearing protection, gloves | Price locally | Included |
| Baffles, depth markers, bag disposal, the trips | Price locally | Included |
| Total | $2,095 plus the two priced-locally lines | $2,600 to $3,200 |
Subtract the columns. $2,600 minus $2,095 is $505, and $3,200 minus $2,095 is $1,105. That gap is 19 to 35 percent of the hired figure, and it is the whole prize. Out of it come the protective gear, the baffles, the disposal and the trips. The free machine matters here: it is the one line in a do-it-yourself blown attic that people expect to pay for and do not.
Be clear about what the hire column rests on. Its labor half is the trade wage times a 2.0 to 3.0 multiplier, which works out at $52.64 to $78.96 a crew-hour. That multiplier is a judgement call, not a measured figure, and it is the single input most worth narrowing on this site. Material dominates the total either way, and you buy material at the same shelf price the model uses while a contractor buys below it. That is why the gap is thinner than the usual framing of this decision.
The recommendation
Work down these and stop at the first that fits your attic.
- The attic fails a safety line below. Low headroom, no safe footing, knob and tube wiring, or anything that might be vermiculite. Hire it, or stop and get it checked. Nothing in the arithmetic outranks this.
- The job needs fewer than 10 bags. The machine is no longer free, no rate is published, and a few bags spread by hand or a run of batts finishes the same area. Skip the rental.
- Roughly 1,000 to 1,500 square feet, walkable, air sealing already done, two people for a full day. The machine is free, the material is the same price either way, and the gap on the worked attic is $505 to $1,105. Renting is the reasonable call.
- Bigger than that, or a deep target, or a hot attic in August. The saving keeps growing and so does the handling: this attic alone is 853 lb of fiberglass, or 2,150 lb of cellulose, to carry and pour. Rent only with three people and a cleared day, otherwise hire.
Get quotes for blown-in attic insulation
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Cellulose or fiberglass out of a rented machine
Both go through the same class of machine and the free day applies to both. They do not behave the same in the hopper or on your ceiling, and the bag counts are not close.
| On the worked attic, at R-49 | Expanding fiberglass | Cellulose |
|---|---|---|
| Bags, rounded up | 31 | 86 |
| Material at retail | $2,095 | $1,373 |
| Material per square foot | $1.71 | $1.09 to $1.13 |
| Weight to carry and pour | 853 lb | 2,150 lb |
Cellulose costs less per square foot of ceiling. It is also a great deal more lifting. Those two facts are the trade, and neither one settles it. Weight on the ceiling, dust in the air, and how each material behaves out of a hopper matter as much. Cellulose against fiberglass compares them properly. Both prices are single retail listings at one retailer on one day, and a store or a ZIP away they will differ.
The cellulose figure above is $15.97 a bag over 14.6 to 14.1 sq ft, the manufacturer's framed and unframed coverage at R-49. The retail listing publishes one coverage figure, 48.8 sq ft, which is its R-19 framing-adjusted number. Attic coverage at higher R-values comes from the manufacturer attic card, not from the retailer.
Safety, and the one thing that stops the job
A rented machine puts a homeowner in the same air a crew works in, without the rules that cover a crew. OSHA's breathing protection standard binds an employer over the people it sends. In your own attic you are outside it. The fiber is the same either way, so the protection is on you.
- Hearing protection. The listing publishes 85 dB and does not say how it was measured. NIOSH recommends keeping workplace noise at or below 85 A-weighted decibels averaged over an eight hour day. Ear plugs or muffs, for both people. The one feeding the hopper stands next to the machine all day.
- A rated respirator, not a dust mask. P100 or N95, with a seal that fits your face. Loose fiber and old settled dust go airborne the moment the hose starts.
- Sealed eye protection. Goggles that seal, not open safety glasses. Fiber falls, and under a roof deck it falls at eye level.
- Walk on the joists only. Loose-fill hides the framing within minutes, and blown material looks like a floor and is not one. Move two boards ahead of yourself, and lay them before the depth goes down.
- Stop if it might be vermiculite. Loose gray-brown pebbles that shine, and pour rather than mat. Do not disturb it and do not blow over it. Vermiculite and asbestos explains why the EPA says to leave it alone, and who to call.
The kit below has no optional items in it.
Insulation Report earns a commission if you buy through some of the product links on this page. It costs you nothing extra and it does not change which products we recommend or what we say about them.
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Fitted respirator, not a dust mask
Look for P100 or N95 rated, with a seal that fits your face. A loose surgical-style mask is not this.
Loose fiber and settled dust go airborne the moment you move around up there.
Skip it if Never. This is the item that has no version of the job without it.
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Look for Goggles that seal against the face rather than open safety glasses.
Fiber falls, and it falls at eye level when you are working under a roof deck.
Skip it if Never, for the same reason.
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Look for Anything that covers skin. Coated palms beat bare knit for handling batts and hardware cloth.
Fiberglass itches for days and washing does not fully clear it from clothing.
Skip it if You are only opening the hatch to look and measure.
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Look for Two lengths of rigid board or plywood you can move ahead of yourself.
You step only on framing. Boards spread your weight and give you somewhere to put a knee.
Skip it if The attic already has a walkable deck across the whole area you are working in.
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Look for A hooded suit rated for particulates. The DuPont Tyvek 400 style is the common one, and it comes in sizes, so buy yours rather than the first size listed.
Fiberglass in clothing survives a wash and keeps itching. A suit you throw away at the hatch ends the problem at the hatch.
Skip it if You are working in cellulose rather than fiberglass and do not mind laundering what you wore, or the job is a ten-minute look with a torch.
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Look for Strap-on pads with a hard cap, not the soft gardening kind.
The whole job happens kneeling on framing. A joist edge is an inch and a half of wood and your knee finds it within a minute.
Skip it if Your boards are wide enough to kneel on flat, which is most of the point of them.
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Look for Hands-free. Any output; attics are small spaces.
Both hands are busy, and a torch in your teeth points at the wrong thing.
Skip it if You already own one.
Hearing protection is not on that list. Add it, and buy it with the respirator.
You may not need a blower at all
We do not sell insulation and we do not install it, which is why this section exists. A free machine is not a free job, and there are attics where a rented blower is the wrong tool at any price.
- Low clearance. If you cannot kneel upright and aim a hose, you cannot control where the material lands. A shallow roof over a large floor is the case that most often defeats a homeowner with a rented machine.
- No walk boards and no safe footing. Truss webs at close centers, or a ceiling you cannot cross without straddling, means every step is a decision. A foot through the drywall costs more than the whole job.
- Knob and tube wiring. Old ceramic knobs and single cloth-covered wires running through the framing. That wiring is designed to shed heat into open air, and many local rules bar burying it. Get it looked at by an electrician before anything covers it.
- Anything you suspect is asbestos. Vermiculite, or old pipe and duct wrapping that is fraying. Stop. Read this first, and do not use a quote form for it, because insulation contractors are not asbestos abatement contractors.
- You are already close to target. If the attic measures within about R-10 of the level recommended for your zone, which is this site's own estimate rather than a measured threshold, more depth pays back slowly. The depth checker turns a tape measurement into an R-value range, and air sealing is usually the better spend at that point.
And the material is never free. 31 bags for the worked attic is $2,095 at shelf price, which is most of what a hired job costs. The machine is the small line, and it is the one line that comes to nothing.
Related
Common questions
Is an insulation blower rental really free?
It is free for a day if you buy ten bags of loose-fill from the same store. All three terms read on 2026-08-11 set the same ten bag threshold: The Home Depot for cellulose, The Home Depot for Owens Corning AttiCat fiberglass, and Lowe's for AttiCat. Neither retailer posts a paid daily rate on the rental listing, so this page gives none. A deposit or a card hold at the counter is normal and is not published either, so ask before you drive over. The material is not free: 31 bags for a 1,200 square foot attic at R-49 is $2,095 at retail shelf price.
How big does my attic have to be to get ten bags?
Take your floor area and divide it by what one bag covers at your target R-value. One bag of Owens Corning AttiCat blown-in fiberglass, 27.5 lb bag covers 39.5 square feet at R-49, so ten bags cover about 395 square feet. At R-30 one bag covers 68.5 square feet, so it takes about 685 square feet of attic to reach ten. Cellulose bags cover much less floor each, so a cellulose job clears ten bags at roughly 141 to 146 square feet at R-49. Deeper targets and cellulose both reach the threshold on smaller attics.
What does the machine cost if I do not buy ten bags?
Nobody publishes it. Both retailers state the free-with-ten-bags term on the listing and neither states a paid daily rate beside it, so no figure for that case exists in this site's data and none is printed. Call the rental desk at your own store and ask for the day rate and the deposit before you plan around it. For a job that small, a bag of loose-fill spread by hand, or batts cut to fit, often beats hauling a 165 lb machine home for an afternoon.
Can one person blow an attic alone?
Not well. The machine sits on the ground or in the driveway and the hose runs up to the attic, so one person feeds bags into the hopper while the other works the hose. Nothing feeds itself. A 1,200 square foot attic at R-49 is 31 bags of expanding fiberglass, about 853 lb to carry, cut open and pour, or 86 bags of the cellulose anchor, about 2,150 lb. Book two people and a full day rather than an afternoon. A third pair of hands moves bags and is worth having on a large attic.
Is a rented blower as good as a contractor machine?
No, and the published specification is the honest way to see it. The rental machine on the listing moves 450 lb an hour through 100 feet of hose. A contractor truck carries a bigger machine, more hose, and a crew that has aimed one before. What that costs you is reach and evenness at the far corners of the attic, where the hose is at its limit and the material lands thin. Depth at the eaves is the part of a blown attic most often short, and it is the part a rented machine makes hardest.
How loud is an insulation blower?
The rental listing publishes 85 dB for the machine. It does not say how that was measured or from how far away, so treat it as a reason to wear hearing protection rather than as your exposure. For scale, NIOSH recommends keeping occupational noise at or below 85 A-weighted decibels averaged over an eight hour workday. Buy ear plugs or ear muffs with the respirator and the goggles. The machine runs for hours, and the person feeding it stands next to it the whole time.
Do I need a blower for batts?
No. Batts are cut and laid by hand, so there is no machine, no hose and no second person at the hopper. That makes a batt job the easier one to do alone and the slower one to finish, because every batt gets cut around wiring, bracing and pipes. Loose-fill out of a machine fills those gaps on its own, which is why it is the usual answer for an attic floor. Batts stay the better answer where you need to lift material later, or where the area is small enough that ten bags would never happen.