Moss Can Weigh More Than a Ton Clean it off Your Roof

Toggle Menu

Your buildings will
look brand new

Dirty Roof?

Let's Make it a




As trusted by:

Is Roof Cleaning Safe?

Access Platform Hire Kent

27th August 2021 General

Is Roof Cleaning Safe?

Yes; roof cleaning is safe, if done by trained professionals using the correct equipment and cleaning solutions. Using a high-power pressure washer is not a good idea and is likely to damage roof tiles, remove mortar pointing and force water beneath roof tiles or slates.

Soft washing is the safest and most effective method of cleaning a roof. The process uses a combination of sodium hypochlorite, pure water, and a product such as Green Wash (available from SoftWash Systems), applied at low pressure from a distance of 6 feet away. Soft washing works at a far lower pressure than pressure washing because the low-VOC biodegradable soft washing solution kills and emulsifies organic matter while also breaking down its bond to the roof’s surface. The roof then simply needs a final rinse at low pressure to remove the debris.

A soft washed roof will be free from organic matter (moss, lichen, algae, etc) will stay clean far longer (normally between 4-6 times longer) than if it had been pressure washed because the roof’s surface has effectively been sanitised.

Pressure washing simply rips away the visible organic matter, inevitably leaving plenty behind which may not be visible initially, but with a surprisingly short time, this organic matter would be visible once more, having simply been mowed (and watered!).

Health and Safety

At Purple Rhino, we invest heavily in equipment for working safely at height without ever setting foot on the roof. We take health and safety extremely seriously and underpin this with our comprehensive insurance. It’s vital make sure a roof cleaner’s insurance is adequate. In some cases, if cover is inadequate, liability may be on the home owner’s shoulders.

Soft washing will sometimes reveal cracked tiles. Roof tiles are often cracked BEFORE being soft washed, but being covered in moss made it impossible to see. In this case, isn’t it better to identify and replace cracked tiles sooner rather than later, anyway?

Comments are closed.

Case Studies of Our Cleaning Work

See all case studies
  • Case Study

     Purple Rhino Author Logo

    Hospital Render Cleaning

  • Case Study

     Purple Rhino Author Logo

    The Old Railway Station – Petworth

  • Case Study

     Purple Rhino Author Logo

    St Margarets C of E Primary School – Crawley

  • Case Study

     Purple Rhino Author Logo

    Brown Powder Coated Window Frame Restoration Chertsey

  • Commercial building cleaning

    Case Study

     Purple Rhino Author Logo

    Cladding Cleaning Liverpool

  • Case Study

     Purple Rhino Author Logo

    Green Powder Coated Aluminium Window Frame Restoration

What our Clients Think

See all testimonials
  • Good Job. Will Use Again.

    The cladding looked extremely bad and now looks as good as new,

    The Purple Rhino cladding cleaning team are extremely well organised and turned up on site with all necessary cladding cleaning equipment and detergents.

    Specialist cladding cleaning vans and and access machines were included.

    Brian Connolly Site Services Manager
    Nutricia Advanced Medical Nutrition , Liverpool

  • Our listed railway station is built entirely of wood and our Pullman railway carriages  are also built of timber and all these structures require regular and gentle washing, without harmful chemicals, to preserve the paint.  We have used Purple Rhino for over 2 years and their structured approach to this large task ensures our buildings and windows stay in pristine condition.  Their use of specially purified water ensures a streak-free finish every time

    Gudmund Olaffson Director
    The Old Railway Station, Petworth

  • Thank you for your help.

    I am loading invoice now so should be able to arrange payment this week. Thanks again for the work your company have done, we are really pleased.

    Kind regards

    Christine Charles

  • I’ve been impressed with the quality and cost and will be using you again.

    Marc Brownlee
    Cofeley, Birmigham

Purple Rhino Blog

See all Purple Rhino News

Our Recent Work

Call Us Email Us

Your buildings will
look brand new