Leo

May 24, 2022

Hi Doug. Bio Cleanze will have done it’s work after 30-120 minutes but it’s better if it can be allowed to dry into the joints and under the laps. And of course it depends on how long after the treatment it rains and how heavy the rain is. Ideally Bio Cleanze should be left to dry, so check the weather forecast and keep an eye on the sky. In our climate it’s not always possible to allow enough time for complete drying; so allow as long as possible for the biocide to activate, and reschedule if the forecast for your intended working day is for heavy rain.

Copy and paste this link into your browser for more detailed info (or type “rain” into our in-site search engine – the magnifying glass icon in the main menu):

www.benzsoftwash.com/blogs/trade-tips/rain-after-softwashing-applying-bio-cleanze?

Doug Eadie

May 24, 2022

Hi,will rain have any impact on result once roof is spayed?

Leo

July 31, 2017

Hi Sidney

My same comments as for your previous question apply because there are so many permutations of material involved in manufacturing man-made slates.

You could also consider treating with Benz Biocidal Wash, which should do the job without harming anything. The downside is that it can take several months to show full results and you’ll need to educate your customer to be patient while waiting to see the full effects of your work.

The rule is to treat a small test area of any surface you are not sure of before beginning full treatment. That’s the only way to know for sure if a soft wash chemical is going to be safe for a given surface.

Regarding sealing: If you rinse the roof thoroughly after treating with either Benz Blackwash or Benz Biocidal Wash there should not be a problem. To be absolutely certain you should check with the manufacturer of the sealer you want to use if there could be any possible negative implications. Send them our SDS sheets and let them know the surface will be rinsed prior to applying the sealer.

sidney murtagh

July 27, 2017

hi leo i want to spray blackwash on to a chimney to removed red algae will the run off take the coating of man made slats

Leo

May 11, 2017

Hi Sidney,

Thanks for your question. We cannot comment on all man-made slats as the materials can differ from roof to roof. The rule of thumb is always clean a small, obscure test patch first and look for the tell-tale pitting of the tile coating before treating or cleaning the whole roof. Always obtain your customer’s agreement that the results of the test patch are acceptable and get their permission to continue treatment of the remaining roof surface.

Regards sealers, we are testing a sealer now and, if all goes well, will be offering this asap. In the meantime, if you think a surface needs sealing be sure to use a breathable sealer, preferably water-based. Our observations and experience suggests that non-breathable sealers or those that put a thick coating on a surface should be avoided. The sealers we prefer soak into the surface, preventing the ingress of water, without changing the appearance of the surface.

I hope this helps, Leo

sidney murtagh

May 04, 2017

hi ben will all man made slats go white if treated with biocides just clean down a roof now im wondered what to do next need to seal roof after cleaning. thank. sid murtagh