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| Thread ID: 71917 | 2006-08-21 13:25:00 | How to remove mould from rooftop? | Renmoo (66) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 479891 | 2006-08-21 13:25:00 | Dear all, my house's rooftop has been gathering a lot of patches of green mould and they are unwashable by rain. What is the best way to remove those ugly patches? I believe the idea of using jet-sprayed water would pop into most people's mind, but does it really work? My dad thinks that it is quite dangerous to climb up the roof and clean it using scrubs (I know... I know..., but we are not used to climbing up the roof as if we are on the ground). Perhaps he should hire a contractor to do it instead? Thanks for any feedbacks. Cheers :) |
Renmoo (66) | ||
| 479892 | 2006-08-21 14:27:00 | Dear all, my house's rooftop has been gathering a lot of patches of green mould and they are unwashable by rain. What is the best way to remove those ugly patches? I believe the idea of using jet-sprayed water would pop into most people's mind, but does it really work? My dad thinks that it is quite dangerous to climb up the roof and clean it using scrubs (I know... I know..., but we are not used to climbing up the roof as if we are on the ground). Perhaps he should hire a contractor to do it instead? Thanks for any feedbacks. Cheers :) use wet and forget or 30 seconds |
Tux (606) | ||
| 479893 | 2006-08-21 14:52:00 | If its iron, maybe you could pull the nails and flip it over! | Rob99 (151) | ||
| 479894 | 2006-08-21 20:23:00 | Rob is of course joking If it is Iron, then a stiff broom and soapy water should do the trick, but you have to be careful the mold/lichen doesn't end blocking your guttering If it is a tile roof, it may pay to get a contractor in, as you could end up with leaks if you are not ultra careful |
Morgenmuffel (187) | ||
| 479895 | 2006-08-21 20:50:00 | Hire a good water blaster. | Cicero (40) | ||
| 479896 | 2006-08-21 21:00:00 | Hire a good water blaster. Yes. Falling off roofs causes many serious accidents and even death. I have water blasted our roof prior to painting and need to do so again this year but this time I will use a safety rope. BTW, if you plan to use a water blaster to remove mould moss or lichen from any surface, do not waste your time with the cheap sprayers now available - get a proper high pressure unit from a hire centre. |
Strommer (42) | ||
| 479897 | 2006-08-21 21:16:00 | We had our tile roof professionally sprayed, cleaned and sealed a few years back by a contractor (Edwards & Hardy Roofing or something along those lines). They first sprayed with the chemical to kill the lichen etc. properly - and then left it for 6 months to work. They said that the "fast acting" chemicals like 30seconds etc. cause damage to the tiles, and wouldn't kill the lichen at the roots properly - so you'd end up re-spraying every year or so. You could actually see the lichen changing colour, and eventually falling off by itself. They came back in 6 months time to wash it thoroughly - no waterblasting because that can damage old tiles, and re-mortar bits which needed it, replaced broken tiles etc. They then sprayed it with some sort of preservative type chemical to "protect" it, and came back 3 weeks later to spray with a silicon sealer or something along those lines. It worked brilliantly - the roof is spotless now, and has been for years. I would really leave it up to the professionals - it's not too expensive to have done (if I recall correctly, it cost about $700 all up for a 3 bedroom house + garage), and you pay in parts for the work which they have done so far. |
somebody (208) | ||
| 479898 | 2006-08-21 22:54:00 | Agree with somebody, professionals are the best and safest. However if the cost is too much for you the quaternary ammonium based compond cleaners made by Ecotect etc from Mitre 10 etc are safe from the chemical angle. The do take a while to act( afew weeks but are effective. Never but never use rhe 30 second sodium hypochlorite bleaches |
bonzo29 (2348) | ||
| 479899 | 2006-08-21 23:07:00 | click here (http://www.edwardsandhardy.co.nz/) I have had my tile roof done by Edwards and Hardy as well. They come back every 2 years or so and spray on a preventative. Trevor :) |
Trev (427) | ||
| 479900 | 2006-08-22 05:35:00 | Hmmmm. My son just mailed me 24 500ml cans of Sika -W715. This is apparently a mould, lichen and algae remover suitable for roofs, metal, stone, concrete, painted and unpainted wood etc etc. Spray, paint or sponge on, leave for a bit and hose off. And I don't have a mould, lichen or algae problem.... |
pctek (84) | ||
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