and these terrazo surfaces that are set in a membrane, the water goes through it. concrete's porous. it's a sponge. and the membranes underneath don't have an infinite life. you may get 30 years, you may get 40 years. but when that breaks down, the water's going through the terrazo, hits that worn out membrane and goes new the framing. you should look to see if that's leaking. if it's leaking, you've got an expensive project that you need to take care of before you have a collapse. out there with the garden house and put it on the highest pressure you can and hose down those masonry stairs once a week. what you're doing is pors -- forcing water through there and the memorandum bahrain has probably failed and if you have older terrazzo we suggest you reseal it every so often. companies will come out and acid wash and restain them. i'll tell you, a typical t.e.r.r.a.z.z.o. repair job is probably going to cost you $25,000. >> it's $1,000 a step. it gets pretty expensive. >> so if the homeowner wants someone to come out and go around their house and look at these issue