Rotten Window Frame Replacement in Frederick, MD

Understanding Wood Frame Rot and What Causes It

Wood rot around windows is caused by prolonged moisture exposure — typically from failed perimeter caulk that allows water to enter behind the exterior casing, failed flashing at the sill or head that allows water to infiltrate the rough opening, or chronic condensation from high indoor humidity that keeps the interior sill persistently damp. In Frederick's older homes — many with original painted wood frames from the 1940s through 1980s — failing perimeter caulk combined with decades of weathering is the most common cause.

The rot visible from inside or outside is typically just the surface expression of a larger problem. When we remove a rotten wood frame, we routinely find that the rough opening framing — the jack studs, the sill plate, the header — has also absorbed moisture and shows early or advanced rot. The extent of the framing damage only becomes clear once the old frame is removed. We assess and report what we find before closing up the wall.

For Frederick homes built before 1978, painted wood frames almost certainly contain lead paint. Disturbing lead paint during frame removal triggers EPA RRP (Renovation, Repair, and Painting) rule requirements: the work area must be contained, workers must use appropriate protective equipment, lead-safe work practices must be followed, and the homeowner must receive specific pre-renovation documentation. We follow these requirements and provide the required documentation.