Block paving tends to attract moss and weeds. The sand in the joints can eventually migrate, and over a period of time can lead to sinking and spreading if not looked after.
Block paving needs to be deep cleaned using high pressure steam cleaning equipment to remove all dirt, moss, algae etc.
The benefits of having your block paving sealed is the prevention of weed growth and the reduction in moss growth plus the loss of jointing sand from in between the block work. We recommend steam cleaning rather than jet washing and commercial mechanical sweepers as these can destabilize the blocks which can cause accidents and expensive repairs.
Here are some examples from our previous jobs;