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12. No intakes or plugged soffit ventilation
Even though your soffit vents appear perforated from the exterior of the home, it is very important to make sure that air is flowing through them and into the attic. Often homeowners (and even professionals) will accidentally cover over their soffits with insulation. This can trap moisture in your attic and lead to condensation problems. Having adequate intake ventilation is equally as important as the exhaust ventilation.
Solution:
In order to free up the airflow, remove insulation from the roof inlets at the eaves. If these intake air openings don’t exist, precut them and install grilles for air circulation.
13. Mixed ventilation
Each type of vent is designed to work and handle air flow in its own particular way. Air is intended to travel from the soffit at the eaves to the exhaust vents at the peak. Different vents draw air differently and combining vent types can decrease the efficiency of the ventilation and increase the energy bills. A simple example: if you combine a turbine vent with static vents, the turbine will takes airflow not from the soffit but from the nearest spot vent. This causes unwanted moisture and even snow can appear in the attic.
Solution:
Plug/close all unnecessary vents from inside of the attic. Always try to keep the top vents and cancel the lower vents by plugging them to create a free airflow from the soffit up to the ridge.
14. Installing shingles over old wooden boards
Roofers are commonly using the existing roofing deck regardless of the type or condition that it is in. Specifically in the case of old spaced board decking, this can cause major problems. When expansion and contraction occur, shingles will buckle. This will create gaps in the roofing system making it susceptible to water entry. If your roof deck is old or in poor condition it is always recommended that you cover the complete surface with an approved decking such as OSB or plywood boards. This will provide a stronger hold for the shingles and a better roofing system.
Solution:
Try to repair buckles and waved shingles by pulling out the nails first. Then trim the shingles close to joints and nail them again. Secure these spot also with Shingle Stick. If this repair doesn’t help and shingles are buckling again, start to think about reroofing with a new deck made from OSB or plywood.
Tip:
Take a look at our blog "Roof deck materials to ensure a stable roof surface". You'll find all the info you need on solid roof decks.
15. Not mixing shingles
Always mix shingles from different bundles to avoid color blocks on the finished roof! Different batches of the same shingle can have a slightly different shade, so don’t mix two production dates on the same side of the roof.
Solution:
There is no solution for this mistake. After some time these color blocks will partly disappear when shingles are exposed to the weather conditions.
A high quality roof is created when qualitative shingles are combined with a correct installation. Over the past weeks we showed you some of the most frequent mistakes by roofers. After a while, these mistakes can cause some serious roofing problems.
To end these series, we would like to get your attention for these last 5 mistakes:
- Using a lot of bituminous mastic
- Wrong shingles for hips and ridges
- Improper sealing of penetrations
- Insufficient securing of valley
- Holes due to installation
16. Using a lot of bituminous mastic
Using too much bituminous mastic or roofing cement can cause blistering. The use of mastic which is not compatible with bituminous shingles can also lead to blistering.
Solution:
Blisters can disappear after some period. If they are already opened, it’s better to change these affected shingles.
17. Wrong shingles for hip and ridges
Some roofers will cut shingles into pieces and use these pieces for the hip and ridge cap, regardless of which shingle is being used on the roof. With 3-tab, 4-tab, hex and diamant shingle this is the correct process. If this is done correctly, the shingle is cut into three even pieces (4-tab shingles in 4 pieces) that are flexible enough to use as a cap shingle. Do not use beaver shaped shingles for capping because they are too narrow and don’t cover hip or ridge enough!
The popularity of laminated shingles is increasing, but many roofers are making the mistake of following the same process you would with a 3-tab. The thicker Cambridge shingles are not designed for ridge caps. They do not lay flat and some may crack or break when you bent them over the ridges. It is highly recommended to use only a 3-tab shingle that matches the color of the laminated shingle.
Solution:
If your roof suffers leaking problems through the cap shingles it is necessary to change them with rectangular shape capping.
Too much mastic used
Good amount of mastic
