Browse Forums DIY, Home Maintenance & Repair 1 Jul 04, 2012 8:43 am Hi everyone, I have noticed black lines/marks where beams are on my alfresco ceiling. They are about 1 m long and 10 cm wide. It looks like discoloration. What could be causing these black marks? House is double storey, 3 years old, there is a roof above the ceiling (covering the alfresco), but no rooms with water (bathroom, etc...) above the ceiling. Could these marks be caused by anything else but water? What is the best way to clean the marks? I will try and post a photo as well. Thanks for any help! Re: Black marks alongside beams on alfresco ceiling 2Dec 03, 2012 7:10 pm This sounds like a mould? Is this possible? cheers Our 6m high Cathedral ceiling has 0 insulation, just plaster, wrap and tiles as far as I can tell. Wife likes the exposed beams, I hate the $600 per month heating bill,… 0 13478 THanks , l got a licensed building inspector to look at the rust, he said its just surface rust and it would take many years to become a problem because the beams are so… 22 28046 |