Pressure Washing Concrete Roof Tiles

[elv]

Hello all, Is it ok to pressure wash concrete roof tiles?

The tiles are Marley Double Roman and as we live in a damp area with plenty of trees the moss loves them, i've made a metal profile edge with extending poles to scrape it off but the pressure washer really does fetch it up (i've tested it on a small part), my concern is does pressure washing degrade the tiles waterproofing ability?

Ta in advance..

 

[chappers]

should be fine just be careful not to blast too much water up under the tiles and be careful especially if you are using a pressure washer up a ladder.

 

[elv]

Cheers mate, iv'e done 2/3 of the front and they've came up like almost new, had to take the gutter off and lots of mess but well worth the 6hrs plus, finish the rest off this week, think i'll give it a spray with green killer also.