While it is generally recommended to avoid using sealant on valley flashing, there are a few scenarios where it may be beneficial. If there are noticeable gaps or openings in the flashing that could potentially allow water to pass through, applying a small amount of sealant as a secondary measure may help improve water-tightness. However, it is important to keep in mind that sealant should not be relied upon as the primary defense against leaks.
Consulting a Professional:
If you are unsure about the condition of your valley flashing or whether sealant is necessary, it is always advisable to consult a professional roofing contractor. They have the expertise and experience to evaluate the situation and provide appropriate recommendations. They can inspect the condition of the flashing, identify any potential issues, and advise on the best course of action to ensure a watertight roofing system.
While the primary purpose of valley flashing is to prevent water infiltration, applying sealant is generally not necessary when the flashing is correctly installed. Sealant can potentially cause more harm than good and may not offer long-lasting waterproofing protection. However, if there are visible gaps or openings in the flashing, a small amount of sealant may be considered as a secondary measure. When in doubt, it is always advisable to consult a professional roofing contractor to assess the situation and provide expert advice tailored to your specific needs.