Fibre glass roof

[john306]

Hi, I've got an extension with a flat roof covered with fibre glass about 2 years old. For the 2nd time in 6 months I've had to clean the roof of green algae, there is about a 3 inch fibre glass lip over the edge of the extension and this seems to be causing green algae runs down the exterior rendered walls, it looks awful.
Anyone any ideas to stop this happening please? Thanks

 

[catlad]

Take a holiday

 

[Rufus Raintight]

Only thing I can recommend is a fungicidal wash, but i'm guessing you might have already tried that?

http://www.diy.com/search/results/?question=fungicidal+wash

 

[john306]

Thanks for reply, I have tried that and other washed and its seems to have really ate into the rendering. Is there anything that could be painted on the glass fibre to stop it reacting and dripping down walls causing the algae as the other rendered walls of the house are fine. Thanks

 

[chappers]

most roofs have agae on them but the smooth nature of fibreglass roofs does mean it can run off, There are some products that you can spray onto roof tiles to prevent the growth of moss and algae, but not sure if they would adhere to the fibreglass or just get washed off

 

[Nige F]

Sounds like the lip is too close to the rendered wall ? Can you post a pic.

 

[john306]

Sounds like the lip is too close to the rendered wall ? Can you post a pic.

Not right now as I'm away from home, but I'm guessing 2 to 3 inches out from the wall, but you are correct because it has been running down the walls on all 3 sides unfortunately

 

[palaceray]

If the roof is falling in that direction there should be a gutter there which would collect the water as it drips off and take it to a downpipe.

 

[catlad]

He's not bothered anymore he's on holiday