Older roofs, older decking
Century-old houses often have plank sheathing rather than plywood or OSB, with gaps between the boards. Plank decking holds fasteners differently, can cup and separate with age, and does not always provide continuous support for modern shingle products. It is entirely workable — it just needs to be identified before the job is scoped rather than discovered on the second morning.
- Plank decking with gaps, cupping or split boards
- Rot at eaves and around long-standing leak paths
- Framing that has moved over a century, producing uneven planes
- Multiple previous coverings and repairs layered up






