So what happens when an inexperienced worker is put on a Columbia Tile roof and told to power wash the concrete tiles. Well several things can and probably will happen and the only good one is that the tiles will look cleaner then they were before. I’ve had one too many calls from a home owner who tells me that their clay or concrete tile roof was just power washed and never leaked before… BUT now they have a leak and have lost confidence in the guys who did the washing. I can’t say I blame them. I find an assortment of issues when I arrive including freshly broken tiles, pan flashings completely plugged with cement-based wash off and dirty skylights both inside and out. The attached photo, from the Burnaby job I did today, shows what a misguided power wash blast can do to your interior paint job. The lesson learned? If you are going to power wash you roof…. make sure the guy knows what he is doing. Do your “Due Diligence” and ask all the right questions.