Preparing a deck for built-up roofing (BUR) involves creating a stable, smooth, and secure base to support the heavy layers of roofing felt and asphalt. This starts with ensuring the decking material is solid, typically plywood or OSB, with no signs of rot or damage. Sheathing should be installed in a manner that provides full coverage without gaps; panels are usually laid perpendicular to the roof joists and fastened with corrosion-resistant nails or screws spaced closely enough to prevent movement but not so tight they damage the wood. It’s important to check that the deck is clean and free of debris or protrusions that could damage roofing layers. The flatness of the deck is crucial; an uneven surface can lead to pooling water or bubbles in the roof. Using a straightedge or level, homeowners can check for any significant dips or peaks. Minor imperfections can sometimes be leveled with plywood shims or underlayment, but large inconsistencies likely need professional attention.
Performing a basic inspection yourself involves walking over the deck carefully to spot any soft spots or squeaks that indicate loose sheathing or damaged wood. Visible gaps or raised edges should be noted. These are simple warning signs that mean it’s time to call a roofer or general contractor. When you bring in a professional, ask specifically how they plan to secure the decking and if they recommend any additional underlayment or insulation to protect your investment. Also inquire about fastener types and spacing, as using appropriate corrosion-resistant fasteners improves the longevity of the roof. Most manufacturers require a smooth, well-fastened deck as a warranty condition, so clarifying these details upfront helps prevent future disputes. Remember, a qualified roofer will ensure the deck is ready to carry the weight of the BUR without compromising structural integrity or warranty coverage.