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FAQs

Why Do I Have Icicles On My Roof?

Icicles usually form right along the bottom edge of a roof. It’s simply a result of insufficient attic insulation, or poorly installed insulation. Whether it’s icicles or “ice damming”, it could lead to water leakage in parts of the attic, and even through the ceiling and walls. In short, icicles are a symptom that requires further diagnosis and a permanent fix to avoid serious potential damage.

Icicleswill usually form when roof snow slowly melts and flows down the roof, refreezing at the edge of the roof. Clearly, this will only occur when the roof surface warms above freezing – it will be warm enough to melt snow. However, when the roof edge is below freezing, the melting snow will refreeze and create icicles. For professional contractors, it’s a sign of insulation problems.

In expansive areas like the roof and attic cavity, insulation professionals will start by making the space airtight. For the installers at Great Northern Insulation, sealing the attic is critical, even before insulation is installed. Proper sealing closes up every hole, gap, and crack throughout the attic cavity. In fact, without proper sealing, no insulation product will perform at its peak.

Airtightness in the attic will stop air leakage, control airflow and moisture, and improve energy efficiency. At GNI, installersensure that the attic is sealed, insulated, and ventilated - a “system” that works together for maximum performance. The result: improved energy consumption; more efficient HVAC operation; reduced utility bills; and enhanced seasonal indoor comfort.

As for product options when insulating the attic, GNI highly recommends spray foam (known as Spray Polyurethane Foam). For cavities like the attic and roof, the application is ideal - it blocks airflow, it stops moisture from gathering; and it provides exceptional R-Value where installed. GNI specializes in SPF, with products and installations that are fully warrantied. 

Most Popular Questions

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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 Jones 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

Eastern Ontario

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

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.

Homestars

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! 

GreenGuard

The GREENGUARD®
Gold Certification promise

GREENGUARD® Gold Certification ensures the strictest criteria for low-level chemical emissions. Certified products are safe for individuals with sensitivities (children/elderly) and safe for use in school environments and health-care facilities. The product certification is widely recognized by the LEED Rating System (Leadership in Energy/Environmental Design).

EcoLogo

ECOLOGOTM:
Multi-attribute product certification

ECOLOGOTM is an accredited sign of environmental performance – holistic – green – sustainable - and compliant with strict, third party standards. Life cycle criteria for product certification may include manufacturing and operations; health and environment; product materials and performance; and product innovation, development, and management.

3M

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

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

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.

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