Roll roofing is a popular and cost-effective solution for low-slope roofs or temporary roofing needs. When installing roll roofing, questions often arise about whether it’s necessary to nail the top seam for proper installation. In this article, we’ll provide a straightforward answer and the reasoning behind it.
Nailing the Top Seam of Roll Roofing
No, you typically do not need to nail the top seam of roll roofing. Roll roofing, also known as mineral-surfaced roofing, is primarily self-adhesive. It features an adhesive backing that activates and secures the roofing material in place when exposed to heat and sunlight.
How Roll Roofing Works
The installation process for roll roofing is relatively simple:
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Prepare the Roof Deck: Ensure the roof deck is clean, dry, and free from any debris.
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Apply Underlayment: Roll roofing is typically installed over an underlayment or roofing felt. This underlayment provides an additional layer of protection.
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Roll Out the Roofing Material: Roll out the roofing material across the roof, ensuring it is properly aligned and overhanging the edges.
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Secure the Material: As the day heats up and the sun activates the adhesive backing, the roll roofing material adheres to the roof deck and underlayment. Rolling it with a heavy roller can help ensure a secure bond.
Exceptions and Special Cases
While it’s generally not necessary to nail the top seam of roll roofing, there can be exceptions or special cases:
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Severe Weather: In areas prone to extreme wind conditions, it may be prudent to apply roofing cement or adhesive under the top seam and secure it with a few roofing nails or staples to prevent wind uplift.
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Pitched Roofs: On roofs with a steeper pitch, the self-adhesive backing may not be sufficient to keep the roofing material in place. In such cases, consult the manufacturer’s guidelines for specific instructions on securing the top seam.
Conclusion
In most standard roll roofing installations, nailing the top seam is unnecessary. The self-adhesive backing activates in response to heat and sunlight, ensuring a secure bond. However, always consider your local weather conditions and the specific pitch of your roof. If you have concerns about wind uplift or the material staying in place, consult the manufacturer’s guidelines or a roofing professional for guidance on securing the top seam effectively.