Most gaps in exterior wood trim are caused by poor installation of the trim or shrinkage in the wood trim. Gaps in exterior wood trim must be repaired with a material that flexes with the natural expansion and shrinkage of wood. Repair material should not create another gap or crack. Before deciding to fill a gap in exterior trim, determine if it is possible to remove and match a piece of the trim--cutting a new piece to eliminate the gap. In most cases, removal and trim replacement is not cost efficient. Repairing by filling the gap with a silicone-based caulk is usually the preferred course of action.
Things You'll Need
- Putty knife
- Utility knife
- Exterior silicone-based caulk
- Caulking gun
- Towels and rags
Scrape dirt, paint and old caulking out of the gap in the exterior wood trim, using a putty knife, screwdriver or utility knife.
Snap the caulk tube into the caulk gun. Squeeze the trigger to fill the gap with caulk.
Smooth with a wet sponge, small putty knife or your finger while the caulk is still pliable. Tidy with a towel.
Follow manufacturer's instructions for caulk cure time and temperature installation parameters.
Finish with primer and paint to match.
Tips & Warnings
- This process can also be followed for gaps created by a loose trim piece, window trim gaps, fascia board and soffit gaps or siding issues.
- Do not use wood filler to repair a gap in exterior wood trim as it shrinks, falls out and cracks in extreme weather conditions.
- Photo Credit glazier image by Greg Pickens from Fotolia.com
How to Repair and Prevent Wood Rot
Learn to repair rot and decay using two-part epoxy, with options for other products, and ways to prevent rot from happening again.
How to Install Vinyl Soffit & Fascia
Vinyl soffit and fascia has become one of the most often used products for exterior trim. It has practically replaced aluminum in...
How to Repair Cracks in Exterior Wood Doors
Exterior wood doors have always been problematic. Wood expands and contracts because of humidity and exposure. Wood cracks along the grain or...
How to Seal Outdoor Wood Gaps
Any outdoor gap between wood siding or trim allows water to enter the exterior walls from rain and humidity. After water enters...