This is because the water comes out too forcefully and can damage the material.
Power wash a torch down roof.
Here is a link preparations instructions to get the roof ready to coat.
Start with a medium pressure spray pattern and adjust from there accordingly.
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Sweep or hose down area to remove all dust dirt and residues.
The power of a pressure washer can damage the shingles on your roof so it s important that you select the proper spray tip.
It is applied almost like paint so all you would need to is power wash your existing flat roof and apply another coat.
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Remove rust by wire brushing.
Scrub areas where water ponds with detergent and water and rinse well.
Always stand on a dry area of the roof as wet shingles can be very slippery.
Leave the roof to dry.
Use similar materials to patch up the damaged areas.
Most contractors don t recommend pressure washing or power washing a roof.
The coating protects the roof from elements specially the sun which degrades roofing material so that is how it extends the life of roof.
Pressure cleaning a roof when done properly using rotary cleaning equipment is safe cost effective and will not force water through or under tiles as the jet angle is controlled and always points away and down the roof rather than into or all over the place which is the case when blasting with a lance or wand is used.
Surface must be clean dry and in good repair.
Allow to dry thoroughly.
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Clean the entire roof of any residual cleaning products and dust with a power washing machine.
Use low pressure to spray it clean.
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Instead soft washing with a garden hose is least likely to chip dent or crack the tiles or panels.
Rinse all traces of detergent or cleaning agent.