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Old 07-16-2010, 01:25 PM   #1
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Any care for decks that won't mildew?


Howdy,

Long time DIYer, first time question here. A few years ago I built a garden cottage for the Mrs, and sided a small area of my house, both with cedar. I used the same linseed oil based wood treatment, Weathershield Clear from Menards, and have since been rewarded with lots of nice black mildewed wood. Seems as though mildew just loves to eat linseed oil. I'm currently rebuilding my deack with new PT deck boards, and cedar railings and ballisters, and would like to at least add a bit of weathering resistance to the cedar. Since most of these products contain linseed oil, does anyone have any good experience with an outdoor, clear or nearly clear, wood treatment that doesn't mildew? Thompson's Waterseal claims not to, but in my experience it doesn't do much of anything anyway.

Thank you......
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Old 07-17-2010, 07:18 AM   #2
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Most exterior finishes have a mildewcide in the product(check the label for ingredients), but sun is a major enemy of mildew. I assume that this wood is shaded with lots of moisture laden vegetation???
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Old 07-17-2010, 09:40 AM   #3
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The siding on the house is indeed shaded, with some nearby vegetation, but it's hardly a jungle. The garden cottage shows mildew growth on all sides, some of which are shaded, and some are not. I live in central Iowa, so the wood sees all types of weather too. It has been quite wet here for several years however. We now have a monsoon season from May thru July.

I've been reading up on this issue on the internet, of how many wood finishes / preservatives don't contain enough mildewcide to be effective when the main ingredient is linseed oil. It seems to be a hit or miss proposition brandwise. The Weatherscreen (not Weathershield, sorry) made by PPG and sold at Menards is inexpensive, so that's certainly a clue. I've seen mention of a synthetic based product sold over the internet, but I figure there must certainly be something available in a store, readily available, that doesn't feed the mildew. Some products have an alkyd base, but again, some people have said that mildew eats that as well.

Just wanted to see if there were any specific products people have had good luck with on cedar.
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Old 07-17-2010, 10:51 AM   #4
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only luck we've ever had is 10% clorox/90& wtr solution & pressure wshr

we're using aspecto-coat for deck sealing which doesn't provide any food for mildew - no financial interest
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Old 07-17-2010, 12:02 PM   #5
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Thank you Itsreally,

I have a few methods to clean it off, one of which is bleach and water. I'd never heard of the aspecto-coat stuff, but that seems to be a thick coating, which isn't appropriate for siding. What I want is a transparent or semi-transparent product to keep the cedar from looking too dead. I don't mind applying more every year or two. I just don't want it to feed the mildew, which linseed based products seem to do.

Check out http://www.naturalhandyman.com/iip/infpai/inflin.html and http://www.restorationfinder.com/pre...al-information . Thompsons claims their product doesn't promote mildew like linseed products, but theirs really doesn't do much of anything in my experience.
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