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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

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

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

GTA East

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

TOLL FREE: 1-800-265-1914

GTA & 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


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914

Niagara Region

6260 Don Murie St
Niagara Falls, ON
L2G 0B4

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!

Homestars Best of 2019 Award

Best of 2019

For the third year in a row, HomeStars ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2020 Award

Best of 2020

For four years now, HomeStars has ranked Great Northern Insulation at better than 95% for customer satisfaction.

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

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

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

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


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).


Baeumler ApprovedTM
Professional, Certified and Insured

Baeumler ApprovedTM gives you peace of mind when connecting with contractors, trades and home service providers. All Baeumler Approved members have demonstrated high quality work for customers and other trade professionals. Members must also have Workers Compensation, liability insurance of at least $1,000,000 and prove professional certification.

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 Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – 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?

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