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Insulating the Attic Before Using It For Storage

August 25, 2016

Optimizing attic storage space in a home begins with an air-sealed space that is well ventilated, and well insulated. And while every attic is different from the next, optimizing the storage space is worth doing right the first time. Whether it's basic shelving or integrated cabinetry, attic space can add valuable storage to any home. But no attic is suited for storage unless the insulation and ventilation is properly installed. The space must be both temperature and humidity controlled. It's true that some homeowners store things in the attic, regardless of the quality of insulation or ventilation. And although not every item will be affected by temperature and humidity, long-term storage may bring about nasty outcomes. Insulation in the attic slows down air movement, and maintains a balanced temperature in winter and summer. At the same time, ventilation will prevent excessive heat and humidity. In short, insulation and ventilation must work together. For the most part, attics are a source of moisture buildup (with the exception of drier climates). This is of great concern in every residential attic, even when storage space is not the priority. But there's much more to consider than just insulation: air sealing may be required; a vapour barrier may be necessary; and of course, venting and ventilation must be part of the mix. Doing it right means doing it all, with much of the work well before any insulation product is installed. In expansive spaces like the attic, professional contractors are intent on making the space totally airtight. For this, many are choosing Spray Polyurethane Foam - it effectively seals every hole and gap, and serves to block undesirable airflow in summer and winter. An air sealed space will also allow newly installed insulation to perform better. In fact, SPF can do it all - it's an air sealer, an air barrier, a vapour barrier, and an insulator - all in one. SPF is the ideal attic insulation. Because of its sheer versatility, SPF has become the "go-to" insulation product for attics of all sizes. It's evenly sprayed throughout an attic space, and quickly hardens into a thick "envelope". It actually makes it easy to install storage components and cabinetry, depending on storage need. With the entirety of the attic blanketed, the space is perfectly sealed, and properly insulated. This is an application that will last a lifetime, and never need to be replaced or replenished. For the professionals at Great Northern Insulation, Spray Polyurethane Foam has proven itself in terms of short-term and long-term outcomes. But it has to be installed professionally - this is not a weekend DIY project - it's an installation that requires in-depth expertise with the product, the equipment, and the application. At GNI, installation crews manage the project from end to end. The manufacturer's specifications are followed, and established building codes are respected. GNI offers a sound warranty on installed products, and a company assurance on work preformed. With customer satisfaction at the forefront, GNI ensures that all work is done right the first time.

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

Greater Toronto Area

2 Guided Court
Etobicoke, ON
M9V 4K6

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914

Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.

Homestars Best of 2021 Award

Best of 2021

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

Homestars Best of 2022 Award

Best of 2022

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Trusted for Over 40 Years

Over 40 Years in Business

At GNI, we service your project with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best Installers, Sales Representatives, Customer Care Personnel, Field Superintendents, Estimating and Technical Support to your project.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

January, 2021 regulatory phaseout of hydrofluorocarbons (HFCs) with the introduction of WALLTITE CM01. Using hydrofluorolefins (HFOs) with lower global warming potential (GWP) compared to HFCs, WALLTITE CM01 is the next generation of spray foam insulation.



Heatlok® Soya HFOTM leverages Honeywell’s latest Solstice® Liquid Blowing Agent technology. This new hydrofluoroolefin (HFO) blowing agent is the most environmentally conscious blowing agent produced to date, with a zero ozone depletion potential (ODP) and a global warming potential (GWP) of 1, which is more than two orders of magnitude (99.9%) lower than HFCs used in this industry.


3MTM products.
Quality + Performance = Savings

3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).

Holmes and Holmes

Holmes and Holmes


Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


Enbridge Incentives

The Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


We are Verified & Bonded by eRenovate. When you choose to proceed with our services through their platform, you receive the gaurantees set forth through their program.

As Seen on Love It or List It

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer Cellulose


CLIMATIZER PLUS cellulose insulation is manufactured from a minimum of 85% locally-sourced post-consumer recycled newsprint. Non-toxic additives are applied to the uniquely fiberized paper generating a building material with superior thermal and acoustic properties, as well as exceptional resistance to fire, moisture, mould and pests.

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