General Roofing Systems Canada provides roof ventilation repairs to throughout Canada. Roof ventilation Repairs are completed in the following cities; Calgary, Red Deer, Edmonton, Fort McMurray, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario
Roof Ventilation Changed for Proper Attic Air Flow (Condensation Problems)
This is the time of year that we receive a number of calls from homeowners regarding leaking roof problems.
Some of the top reasons for leaking roof problems are:
- Chimney flashing is installed incorrectly and is leaking.
- Skylight flashing has leaks due to incorrect installation.
3. Valleys on roof are leaking. Shingles in roof valleys are commonly done wrong.
- Attic condensation that causes moisture in the attic. The attic moisture manifests as “roof leaks” due to poor roof ventilation. Roof ventilation is not adequate at either the ridge of the roof (exhaust) or at the soffit area (intake).
- Improper Installation of Roof Underlayment.
- Improper Installation of Roof Vents and Penetrations
- Improper Installation of Roof Flashing at Wall (where roof meets a wall).
The home in the photos of this roof repair were experiencing leaks in there skylights. To resolve this issue, we changed the skylight flashing, which brought forth further attic condensation problems. The combination of the two problems resulted in the roof ventilation needing to be repaired.
The steps to complete this repair are as follows:
Remove roof vents at peak of roof.
- Remove IKO shingles around roof vents to expose roof underlay.
- Remove roof underlayment to roof deck (sheathing).
- Remove DuroFlo vent to expose roof attic space.
- Inspect exposed roof deck for damage due to attic moisture (condensation).
- Install backing to opening and fasten roof deck patch to holes.
- Install patch cut to fit each hole.
- Install new roof underlay.
- Install IKO shingles as needed.
Install 2 new Whirlybird turbine roof vents at peak:
1. Remove IKO shingles at location on roof.
2. Remove roof underlay to expose roof deck.
3. Inspect roof boards for condensation.
4. Cut hole in roof deck to install new vents
5. Attach whirley bird vents to roof deck over vent access.
6. Install new underlayment.
7. Install IKO shingles as needed
About Roof Ventilation:
Correct attic ventilation provides your roof with the correct amount of airflow to prevent moisture buildup. Moisture in the attic space causes roofing to rot and release condensation. Proper ventilation will help energy costs by regulating the temperature of your home.
Attic ventilation is important to reduce the buildup of heat in your attic which can cause ice dams, shingle decay, condensation, higher energy costs and even mould. Additional ventilation is often required in older homes to meet the BC, Alberta, and Saskatchewan Building regulations. This is also required to meet the shingle manufacturer warranty requirements.
Attic ventilation can be corrected:
The roof repair above shows us adding roof vent turbines (whirley birds) to increase air flow to the attic in this home. You can also install ridge vents or more conventional roof vents.
How to Calculate Proper Attic Ventilation:
There is no such thing as having too much attic ventilation. Realistically you want your attic to be the same temperature as it is outside in the winter and in the summer you want to be able to get the warm air out.
The primary focus when ventilating an attic is to not actually bring down the attic temperature (of course this would be beneficial in summer when your house and attic are hot). The main reason for ventilating the attic is to eliminate the moisture in your attic space that causes roof leaks and a host of other problems such as; ice dams, rot, shingle warranty problems, paint peeling and mould. Improper venting causes your house to sweat and not breath right.
The following is how you would calculate the proper amount of ventilation required for an attic:
- Multiply the total square footage of your attic space by 144.
- Divide the total above by 2.
- Divide total above by by 300.
- What is called the “net free” area you now know. The net free square inch area required for intake ventilation (for example at soffit) and the exhaust ventilation (for example the vents at the ridge as in the photos above).
- Divide the “net free” area by the ‘”net free'” area the Ventilation Product Manufacturer provides on the box. This will be your calculation for how many roof vents you need to install for correct attic ventilation.
Attic Solution – Keep the Heat Under Control With Proper Attic Ventilation!!!
Until Next Time,
The Team at GRS
General Roofing Systems Canada (GRS)
24 Hour Emergency Roof Repair: Call +1.877.497.3528 toll-free.
Calgary, Red Deer, Edmonton, Fort McMurray, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario