What Causes a Dry Rot Casement on Window Frames?

Dry Rot

• Dry rot is caused by a fungus. Fungi require moisture and an organic material to feed, grow and reproduce. When moisture attacks wood fibers, it creates the perfect environment for the establishment of fungus growth. Fungus spores can be carried to the wood surface by wind or rain. The fungus then produces spores that send filaments deep into the wood. Dark, unventilated areas favor the growth of this type of fungus, according to the PeterCox website information. Once established, the growth continues as long as there is usable wood for food.

Common Sites for Dry Rot Problems

• Suspect dry rot if you find dry, crumbled wood in areas of your home that are routinely exposed to the elements. Dry rot is usually found in tight crevices around doors, window frames, heating and air conditioning ducts, and plumbing openings.

Window Casement Repair

• A careful assessment of the dry rot damage will help you to decide whether the area needs repair or full replacement of the wood. This assessment should be done in consultation with an experienced home contractor or carpenter to determine the extent of the damage. To repair the damage, the affected wood is dug out and a high-quality wood filler or two-step epoxy is applied deeply into areas to stop the fungus growth, according to the PaintPro website. If a large area is affected, a piece of replacement wood may be necessary. After the filler dries, it is sanded smooth, primed and then painted. More extensive damage to window frames and surrounding wood should be replaced by an experienced carpenter.

Preventing Dry Rot Problems

• To prevent expensive repair from dry rot problems, regularly inspect areas where moisture can intrude into structural components of the home. Caulking areas around doors and window frames will prevent moisture intrusion. Shrubs and other foliage should also be cut back to allow adequate ventilation around windows, doors and outlets for heating, air conditioning and other plumbing. Keeping gutters in good repair and ensuring for good soil drainage will remove excess moisture from vulnerable areas where dry rot can start. Repair damaged window casements as soon as you discover signs of rotting, and treat wood in vulnerable areas of the structure with sodium borate or disodium octoborate tetrahydrate to inhibit wood rot and insect damage, according to Ohio State University Extension writer William F. Lyon.