/diy/ - Do It Yourself

Hey, /diy/.

The roof on my mother's house is leaking pretty bad. We added an anti-leak treatment on it, but the leaks persist. I decided to probe about and ended up ripping up entire sheets of what is essentially a geologic timescale of her house's past leak treatments. I noticed that there was water under the basest level (right below the oldest layer) on some areas and it was damp at others and some of it even had fungus, which alarmed me.

Plus, some of the top layer of the roof's cement also started coming off or breaking apart as I chipped away at the treatment. Pretty much all the work we did the previous days went to shit and it's my fault for wishfully going along with my mother's orders and believing she knew what she was doing. After I showed her all the crap I was pulling off the roof, she decided to consult some guy that apparently knows about this stuff, even though he didn't notice the very obvious fucking bubbles on the roof in the first visit.

Anyways, he says we have to essentially blow off all the treatment, new and old, with a power wash and then add a whole new layer of surface cement to the roof and then add the treatment once again to the new cement.

I don't fully trust this guy and I want to consider what my options are before investing on materials to fix upwards of 1200 square foot roof.

Any way to locate the leaks, add whatever necessary cement to said leaks and fix this problem without having to go through such extremes?

I'd provide pictures, but the sun just went down.

>tl;dr Very leaky roof. How do I fix?