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18. Improper sealing of penetrations
Most residential roofs have soil stacks that require proper sealing. Apply shingles up to the vent pipe and cut an opening in the shingle that is set over the pipe. Set the shingle in approved asphalt cement. Set the vent flange over the pipe - flat on the roof - in asphalt cement that has been evenly applied over the bottom shingle. The top of the flange must be covered with the next row of shingles. Remember that using an excessive amount of plastic cement may cause blistering.
Solution:
Repair improper detail by using a new flange and new shingles. Don’t forget to use IKO Shingle Stick!
Proper sealing around vent pipes is necessary!
An example of proper sealing
An example of proper sealing
19. Insufficient securing of valley
Roof valleys are the places on a roof that are most vulnerable to leaks because they handle a large volume of run-off water. When installing shingles in a roof valley never connect shingles or make joints close to the center line of the valley. It causes leaks.
Solution:
Remove the short pieces from the valley and install a full shingle or piece with appropriate length.
A good example of a secure valley is the Californian method!
20. Holes due to installation
Check your roof for holes. On steeper roofs the roofers will install a toe board to hold materials and themselves. After the installation of shingles is complete, they remove the board and the nail holes are either forgotten or caulked. The caulk may not be of sufficient quality to last as long as the roof. If you hire a roofer to install a new roof, ask them to use roof jacks which are nailed on top of a course and then shingled over. The roof jack can then be removed by lifting it off the slotted hole.
Solution:
Use high quality mastic (Shingle Stick) and drop some granules over these glue dots. Or replace the affected shingles with new ones.
The installation of a shingles roof is a very critical part of your building or renovation project. You must use shingles of high quality and follow the correct application guidelines. If you don’t follow guidelines, you might up with a lot of problems. What can have a consequence of a roofer mistakes
The past few weeks we already showed you 10 problems you can face on your roof (blog part 1 and part 2). Today we will take a look at the following 5 mistakes:
- Insufficient or non-existent attic ventilation
- No intakes or plugged soffit ventilation
- Mixed ventilation
- Installing shingles over old wooden boards
- Not mixing shingles
11. Insufficient or non-existent attic ventilation
When the attic is improperly vented you reduce air movement or have no movement at all. This usually increases moisture content. Under these conditions, heat builds up and shortens the life of your shingles roof. Moisture builds up, causing sheathing movement and deterioration, resulting in shingle failure. These circumstances are a major cause of a shorter life of the shingles roof.
Solution:
Cut exhaust openings for spot vents or ridge ventilation. Install proper ventilation to provide airflow circulation through the roofing structure.
