Home
Roof-overs, the practice of installing a new roof directly over the old one, seem like a cost-effective solution at first glance. However, your chosen roofing company might advise against this method for various reasons. This blog post delves into why roofing professionals usually don’t recommend roof-overs.
Reduced Lifespan of the New Roof
One of the primary concerns with roof-overs is that they can significantly reduce the new roof’s lifespan. Placing new shingles over old ones doesn’t allow for the old material’s removal, meaning any existing problems or potential issues remain unaddressed. This can be particularly problematic in a humid continental climate, where trapped moisture and heat can rapidly deteriorate the new shingles.
Potential for Undiagnosed Damage
Roof-overs limit the ability to inspect the roofing deck and underlying structure thoroughly. It’s common for old roofs to have unseen damage such as rot, mold, or invisible structural weaknesses, which can be difficult to detect without removing the old shingles. Failing to address these problems can lead to more significant and costly repairs in the future.
Increased Weight on the Structure
Adding a new layer of roofing materials on top of old ones increases the weight the structure must support. Furthermore, the added weight of rain or snow during certain seasons can pose a risk to the structural integrity of the house. This is especially concerning for older homes that may not have been designed to bear such loads. Experienced roofers are mindful of these risks and usually recommend a complete tear-off to avoid potential structural issues.
Complications in Warranty and Compliance
Another vital aspect to consider is that many roofing manufacturers do not offer warranties for materials used in a roof-over. This lack of warranty protection is a significant drawback since it leaves you without recourse should your new roof fail prematurely. Additionally, local building codes may have specific requirements that make roof-overs non-compliant or illegal, resulting in potential legal and financial complications.
Environmental Considerations
Though roof-overs reduce waste by leaving the old materials in place, they can be less environmentally friendly in the long term. Since the underlying issues are not addressed, the new roof may need to be replaced sooner, leading to more material waste. Full tear-offs allow for the opportunity to recycle old materials, minimizing environmental impact.
Crown Roofing LTD is a trusted roofing contractor. We follow industry best practices to ensure the longevity, safety, and integrity of your roof. Call us today at (604) 370-6288 or fill out our contact form to schedule a consultation. We serve clients in Vancouver, BC, and surrounding areas.
