Exterior Window Trim Repair and Replacement
Window trim does more than frame the window—it’s part of the home’s exterior water-management system. When trim begins to cup, split, or separate from the siding, even a small gap can allow water to move behind the exterior surface. Over time, this moisture can reach the sheathing or framing and cause issues that stay hidden until the damage becomes significant.
At Arvada Handyman, we handle these problems with a builder-level approach. Instead of simply swapping boards, we start by checking how the window was originally flashed, how water is moving around the opening, and whether any surrounding materials show early signs of deterioration. This step is important in neighborhoods like Candelas, Leyden Rock, Five Parks, Arvada, and Westminster, where high UV exposure and wind-driven rain commonly break down exterior trim faster than expected.
Once we determine the full extent of the issue, we remove any decayed or moisture-softened trim, repair adjacent surfaces as needed, and install new primed boards that match the existing profile. We ensure that head flashing, drip caps, and caulk joints are integrated correctly, so water sheds away from the structure instead of being trapped behind it. Finally, we prep the area for paint so the new trim blends cleanly with the rest of your exterior.
The result is a repair that not only looks clean and sharp but also restores the protective barrier around your window—helping prevent recurring water intrusion and extending the life of your siding and wall system.
Why Window Trim Fails
Window trim is one of the most common points of exterior water intrusion. When caulking breaks down or paint wears thin, moisture can wick into exposed end grain. Colorado’s freeze-thaw cycles expand these gaps and accelerate deterioration.
Typical causes include:
Caulking failure at trim joints and window frames
Miters cut without sealing exposed end grain
Incorrect or missing head flashing above windows
Irrigation overspray and snow accumulation against lower trim boards
Horizontal trim surfaces holding moisture
Homes in developing communities like Candelas and Leyden Rock often show trim deterioration on west and south exposures within 3 to 7 years if maintenance lapses.
Signs Window Trim Needs Replacement
Look for:
Soft or crumbly wood when pressed
Paint peeling, bubbling, or flaking along edges
Gaps between trim boards and siding
Visible mold or dark moisture staining
Warping or splitting at mitered corners
Caulk pulling away from the frame
These symptoms indicate water is entering the material and likely reaching the underlying structure.
Our Window Trim Repair Process
We don’t just patch over rot. We correct the underlying water entry points.
Typical steps:
Assess the damage and identify where water is entering
Remove affected trim and any compromised underlying material
Inspect window flashing and sheathing for secondary damage
Install new trim boards (wood or composite) to match the existing profile
Flash and seal the upper window head properly
Seal all joints with high-performance exterior sealant (not hardware-store caulk)
Prime raw wood and end grain with oil-based primer
Paint the repair to match existing exterior finish
Long-term durability comes from proper sealing and flashing, not just the trim boards themselves.
Material Options
We use exterior-grade materials suited for Colorado weather:
Cedar or Redwood
Natural wood appearance, must be maintained and sealed.Primed Pine or Engineered Wood Trim
Common match for existing homes, cost-effective, requires reliable sealing.Fiber Cement or Composite Trim
Highly rot resistant, excellent for long-term performance, blends well with Hardie or LP siding.
We help identify the right material based on existing siding type and long-term maintenance goals.
Proper Flashing Matters Most
The most overlooked detail in window trim repairs is head flashing. If flashing is missing or installed incorrectly, even perfectly replaced trim will eventually fail. We verify flashing is present, properly sloped, and integrated behind siding. No shortcuts. This is where durability comes from.
Local Repair Experience
We frequently perform window trim repairs in:
Candelas (LP trim rot on sun-facing elevations)
Leyden Rock (open end-grain joints at window corners)
Five Parks (wind-driven moisture infiltration)
Westminster and Arvada neighborhoods built 1990s–2010s (aging paint and caulk systems)
Local familiarity helps us diagnose likely issues before opening the wall.
Fast Quotes. Easy Scheduling. Local Team.
Most siding repair estimates can be done from photos. No sales pressure. No unnecessary upselling.
Text Photos for a Quick Estimate: 303-335-9920
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Request a Quote by Email: Contact@Arvada-handyman.com
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We are a small local team. We do the work ourselves. And we do repairs the right way so it lasts.