Leaky Roof

Old 07-18-05, 05:31 AM
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Leaky Roof

Below are some pics of the mold that is trying to take over my roof on my sun porch. I have been told two different things to get rid of it. Both of them do have to do with bleach. One person said to "blot" using bleach/water and another said scrub with bleach/water. What are your guys suggestion? Also do I need to mix the bleach and water and if so what should be the ratio?






Any help would be greatly appreciated. Thank you.
Old 07-18-05, 06:46 PM
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couldn't access your pics [probably my end] but I usually mix bleach and water no stronger than 50-50 in a garden sprayer. Spray on surface, let set [not dry] and rinse with a garden hose. Stubborn areas may require a second application possibly with scrubbing.
Old 07-18-05, 07:10 PM
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Well, regarding the mold, you need to do 3 things: Kill the mold, clean the mold, and stop the roof leak to cut off the moisture that it's feeding on. Killing the mold (bleach) is the least of your worries, because it's rather pointless, provided you're going to wash it all off. Cleaning it and keeping it from coming back looks to be the challenge here.

As suggested, to kill the mold, spraying on a bleach+tsp+water solution by using a garden sprayer would be best. The TSP is a detergent which will help prepare the surface for cleaning.

To clean the mold, I'd suggest a powerwasher, and experiment with the type of spray nozzle and how close you need to be to clean it effectively- not so close that you blow a hole in the plywood, but close enough to remove the damaged mold infested layers. From the looks of it, the mold has pretty much eaten your plywood for lunch, so it's likely that the powerwasher will blast away quite a bit of wood fiber. But since the damage has already been done (by the leak and by the mold), washing away the weakened wood really isn't weakening the structure any more than it already is.

Lastly, you obviously are aware of what's causing this mold problem- the roof leak around those skylights and the low pitch of the roof. I'm not sure what's on the roof, but that roof is definately too flat for 3 tab shingles. Fixing the roof leak is the key to not having this happen again. Mold will only grow in moist conditions, so if your wood can stay dry, the mold will go dormant.

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