Woodland Windows and Doors Blog

Marvin Multi-Slide Door Sill

If you live in Chicago or the surrounding areas you’ve got to love weather. It’s what we have. If you like oversized patio doors like Marvin’s multi-slide expansive doors you’re going to love the fact that these doors meet aggressive Design Pressure (DP) and Performance Grade (PG ) ratings. DP is a calculation that determines how much wind pressure a window can withstand. PG is an expanded measurement that also verifies structural performance, water penetration and air infiltration resistance and a battery of other performance measures.