Leaking window...stucco exterior

Ive had a window leak for a while. It only leaks in a heavy or wind driven rain and the leak is above the window, which is on the first floor. I had a roofer/remodeler out and he said the roof looks fine (and ive never had water in the attic or anywhere in the walls). He said the stucco doesnt look like it was done correctly, its looks as though someone just put a skim coat directly over the cinder block and then painted it. Its not thick enough and he doubts there is any waterproofing material under the stucco. You can even slightly see the grout (?) lines along the block through the paint in places.

His suggestion was to waterproof the current stucco with 2 coats of elastomeric paint/sealant. He believes water is seeping through the thin skim coat and throught the block and going down the wall and out above the window.

So heres my question, has anyone had expirience with this type of paint or sealant? And i was also thinking if I decide to go this route will it actually work? Should i have him check the flashing on the 3 windows along this wall before the painting is done...i honeslty dont know if they are flashed properly, if at all.

im still waiting on my estimate and Im working on getting estimates from other masons/plaster companies before I decide which route to go...but any opinions?

thanks!

 

When I painted in fla it was commonplace to apply 1 coat of stucco directly to the block. Most times that was sufficient to keep everything dry. 1 coat of elastomeric paint over sound paint or primer should stop any rain from penetrating the stucco. You'd also want to make sure the window is caulked to the stucco. Unless I'm mistaken the windows on a block house aren't flashed since they are recessed into the block opening.

pics might change the advice - How to insert pictures.

 

Thanks! I’ll get some pics when I get home.