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- If the roof is insulated between the rafters, don't forget the ventilation gap above the rafters, which is created by the contra-batten, and sufficient intakes at the eaves.
- With a cold roof system, keep the attic space cold by insulating it from the warm house interior. This will reduce or eliminate snow melting.
- In case there are no snow stoppers mounted on the roof and the snow slides freely and falls from the roof, ensure that the outer edge of the gutters is lower than the slope line to allow snow and ice to slide clear (see drawing). It must always be safe, to avoid danger for passers-by.
Place gutters below the slope line to allow snow and ice to glide clear. >>>
Following these guidelines will help you reduce the risk of roof problems. More roof problems such as typical roof failures and flashing problems will follow in the next blog. Stay tuned!
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Successful roof projects require that the roofer follows the correct application methods. If he doesn’t do the job properly, the final effect will look poor. Even the best and most expensive roofing material cannot help when application instructions aren’t followed. Most importantly, every minor mistake can cause leakage. Every roof repair contributes to decreased lifespan of your roof (and it can be quite expensive as well!). We'll be explaining the most prevalent roofer mistakes.
In the next 4 blogs we’ll be summing up some of the most common mistakes so that poor workmanship can be avoided. Let's start with the following 5 topics:
1. Absence of or incorrectly installed starter strip
2. Improper slope
3. Incorrect shingle overhangs at the eaves
4. Neglecting installation of drip edge flashing at the edge
5. No or improper installed underlayment
1. Leaving out the starter strip or applying the starter incorrectly
The incorrectly installation of the starter strip (or worse, the absence of the starter shingle) brings many problems. You risk water infiltration at the eaves and shingles from the first row can be blown off. It can also cause aesthetical failures
Solution:
If you are missing the starter strip, try to slide a new piece under the shingles of the first course. This new starter strip should be secured with nails and glued with bituminous mastic. Shingles and starter strips at the eaves must always be glued and protected against wind blow off.
2. Improper slope
Always use the right shingles to match the slope of the roof. Minimum slope for the majority of shingles is 15°. Cambridge Xtreme is the only shingle that can be installed from 9,5°. For vertical walls with 90° slope self-adhesive shingles must always be used.
3. Incorrect shingle overhangs at the eaves
The edge of shingles must overhang the eaves between 6 mm and 10 mm. More shingles overhang can cause the shingles to be blown off in high winds and fewer overhangs can allow water to seep into wooden structure.
Solution:
Try to build up and slide in a new drip edge flashing to protect the wooden deck against driven water. Always secure the added metal flashing and shingles with Shingle Stick.
