The first layer on top of the plywood or OSB roof deck is underlayment. For this, we chose a self-healing ice-and-water membrane to protect the shallow-pitched roof deck. The tricky part in laying ...

Oriented Strand Board (OSB) is a structural, engineered wood panel now used for about 70 percent of all floor, wall and roof sheathing in North America. It’s available in 4-foot wide sheets that ...