How Your Roofing Contractor Can Void Your Warranty
Many homeowners take comfort in knowing they have a long warranty on the roofing products installed in their home. Most shingles now even come with a limited lifetime warranty instead of the old 30-year warranty. However, most homeowners are unaware that there are things a roofing contractor can do (or fail to do) that will void the manufacturer’s warranty.
Your roofing contractor should know enough about attic ventilation to properly ventilate your attic. The Building Code (2009) requirement is 1 square foot of ventilation for every 300 square feet of attic space. So if you have a 1500 square foot home. foot You will need approximately 5 m2. ft. (720 sq. in.) of ventilation, divided between intake and exhaust vents. Intake vents are typically on the ceilings, while exhaust vents are at the top of the ceiling.
In the example above, you should have 15 roof louvers (tin vents) with a NFA (net free area) of 50 square feet. in. each. Alternatively, you could opt for a ridge vent like the ShingleVent II (the one we used), in which case you would only need 40′ (or 10 pieces) of ridge vent.
At New Heights Roofing, we recommend increasing ventilation to a ratio of 1:150 from 1:300, as it will greatly increase airflow in your attic, keeping your home cooler in the summer and helping to prevent ice dams. in winter. To do this without covering your roof with roof louvers, we recommend a concealed, continuous ridge vent like ShingleVent II.
If your home doesn’t have proper ventilation and the shingles fail prematurely, they won’t be covered by the manufacturer’s lifetime warranty. Without proper ventilation, your warranty will be reduced to 10 years, without SureStart protection.
Installation over unapproved roof decks
Your roofing contractor should be able to tell you what type of deck your home has and if it is an approved deck for installing shingles. Examples of fully approved decks are plywood (minimum 3/8″), OSB (minimum 7/16″), and wood board sheathing (minimum 1″). If the wood board sheathing is large (1×6, 1×8, 1×10 or 1×12) can cause shingles to sag, so extra precautions should be taken.
Loadmaster and Homasote roof decks are “permit required” decks and must be installed in accordance with the manufacturer’s instructions and may require special fasteners to meet warranty requirements. Other roof decks, such as cementitious wood fiber board, gypsum, and insulation board, are not approved and require an approved deck to be installed over them. These covers are not common among residential houses.
If there is water damage, dry rot, or any other damage to the sheathing, the shingles installed over it will not be covered by the manufacturer’s warranty. An example of this is an undiscovered leak where the wood is not repaired before re-roofing. If that piece of plywood fails in the future, the shingles installed over it will not be covered under warranty.
Another way a roofing contractor can void your warranty is if they don’t properly prepare the roof deck after ripping out an existing roof. If there are nails protruding through the shingles, the damage will not be covered by the manufacturer’s warranty.
To avoid either of these scenarios, we recommend ripping out all existing roofing material (including old felt paper) so we can get a good look at the roof deck and thoroughly inspect it for damage. We also take our time and check the roof deck for any existing nails left behind and drive them into the deck or remove them altogether. New Heights Roofing takes every extra precaution to ensure that our clients never have problems with their roof for years to come.