Stucco Repair at Window and Door Openings

Window and door perimeters are where water gets into Valley homes more than anywhere else. Every opening is a hole cut through the weather barrier, and everything depends on details that are invisible once the stucco goes on.

Text a photo to 602-228-5012

Why openings leak

Sealant fails. The joint between the window frame and the stucco moves every day with thermal cycling. Sealant has a life, typically five to ten years here, and Arizona UV is hard on it. Once it cracks, wind-driven monsoon rain goes straight in.

The flashing was wrong from the start. Head flashing above an opening is supposed to direct water out and over the stucco. When it was installed backwards, left short, or omitted, the wall leaks from the day it was built and nobody knows for twenty years.

Corner cracking. Cracks running diagonally off window corners are extremely common, because stress concentrates at openings. Usually cosmetic, but they become a water path once they open up. More on crack repair

Sills hold water. A sill without enough slope holds water against the joint instead of shedding it.

How you know

• Staining or streaking running down from a corner of the window
• Interior drywall damage or bubbling paint near the frame
• A musty smell along that wall
• Soft stucco below the sill
• Visible gaps or cracked sealant around the frame
• Water appearing inside only during driving rain, not steady rain

That last one is diagnostic. If it only leaks in a storm with wind, it is almost always a perimeter detail rather than a roof issue.

Caulk versus a real repair

Worth being straight about, because this is where money gets wasted.

Caulk is the right answer when the sealant has simply aged out, the joint is otherwise sound, and there is no damage behind the wall. That is a legitimate maintenance item and it is not expensive.

Caulk is the wrong answer when there is staining, softness, or interior damage. At that point water is already behind the wall and sealing the outside traps it. We have opened plenty of windows where somebody caulked over a problem for three years and the framing underneath had rotted through.

If we think caulk is all you need, we will tell you that.

After a window replacement

Every window replacement leaves a stucco perimeter that needs patching and matching. A lot of window companies subcontract this, and the quality varies enormously.

If you have had windows replaced and the patch work is visible, mismatched, or already cracking, that is fixable. We also work directly with window companies who want it done properly. More for trade partners

What it costs

Common questions

Why does my window only leak in a storm?

Wind-driven rain gets into gaps that shed a vertical rain perfectly well. That pattern points at a perimeter sealant or flashing issue rather than the roof.

Can I just caulk it myself?

For simple resealing on a ground-floor window, yes. Use a high-quality elastomeric sealant rated for stucco, cut the old sealant out rather than caulking over it, and do not do it on a surface that is too hot to touch. If there is any staining or softness, stop and have it looked at.

Does the window need to come out?

Usually not. Most perimeter repairs are done from the outside without disturbing the window. It only comes out when the flashing behind it has to be corrected.

My window installer patched the stucco and it looks terrible. Can you fix it?

Yes, this is common. The patch gets cut back and redone with proper texture and color matching.

How often should sealant be replaced?

Every five to ten years in this climate. It is worth checking every spring before monsoon season.

Get a number

Text 602-228-5012 with a photo of the opening and any staining you can see.