Wood framed windows on your home give your home a more traditional look while increasing the insulation of your home's windows to keep your home cooler during the summer and warmer in the winter. When your window frames become damaged from moisture and dry rot, it can cost less to repair the window frames rather than replacing them. Here are some instructions to help you repair your wood window frames.
Remove Rotted Wood
Before you can fill and repair your dry rotted window frames, you will need to remove the dry rot damage. Determine where the dry rot exists in the wood with the use of the pointed end of a screw driver or the end of a chisel.
Poke the sharp end of your tool onto the surface of the wood. Wherever the tool penetrates into the wood indicates where the wood is brittle from rot and will need to be removed. Use a chisel or your screw driver to break off all damaged wood. Keep in mind the damaged wood will be brittle and will easily break off. Then, use a plastic bristled cleaning brush to brush away any loose pieces and dust from the surface.
Clean Surface Mold From Wood
Some sections of your wood frames may have the beginnings of mold damage, as surface mold growth. This mold can darken and discolor the exterior of your wooden window frame but leave the structure of the frame still intact.
First, wipe off any exterior mold growth with a cleaning rag and a cleaning solution of one cap full of non-ammonia laundry detergent, one-fourth cup of bleach, and warm water mixed in a large bucket. Be sure to cover the entire affected area with the cleaning solution to remove as many of the mold spores as possible. Next, spray a full solution of bleach onto the affected wood and let it sit for several minutes. Rinse the area clean with water, and wipe the surface of the wood trim until no mold remains.
If there is mold that has begun to grow within the grain of your wood trim, use a sander or steel wool to sand the wet surface of the wood until no mold remains. Be sure to wear a protective breathing mask to prevent you from inhaling any mold spores. Allow the wood to dry completely before filling the damaged section with epoxy filler.
Treat and Prepare the Frame and Apply the Filler
Be sure you apply the wood filler on a day that is warm and dry, which will help the filler successfully adhere and dry in place. With a drill, bore holes halfway through the wood of the frame along where you removed the rotted wood.
Using a syringe, inject borate wood protector into the wood. This soaks into the surrounding wood to protect it from future moisture and dry rot damage. With a paint brush, apply an epoxy primer onto the area of repair to further help the wood filler adhere onto the frames.
Next, mix up the resin and hardener of your two-part epoxy filler. Apply the mixed filler into the area of damage and use a putty knife to shape the filler to match the rest of the wood trim. Allow the epoxy filler to harden according to the package directions.
Sand and Paint the Repair
Use a medium-grit sandpaper to sand off any bumps and rough edges on the filler repair. Next, use a fine-grit sandpaper to smooth the surface to a uniform surface to blend with the surrounding wood frame.
Be sure to paint the repaired epoxy no later than the following day, as its surface will begin to deteriorate in the sun's ultraviolet light. Apply a coat of acrylic primer, followed with a coat of mold-resistant paint over the entire wood frames to further protect from moisture damage.
Use these instructions to help you repair your home's wood window frames.