Hi All,
Did a search through the archives, seems 8% or lower when painting exterior wood house. That sound right?
Kevin
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Doc,
Is it a new piece of wood?
If you are prepping and painting an existing exterior, the moisure content of the wood is the LAST thing I worry about.
I look for temps of 10 - 25 deg C (50-85 F for you ludites) and better, a forecast of clear weather for about a week to dry out the surface.
Prep is everything.
Quality repairs for your home.
AaronR Construction
Vancouver, Canada
house exterior, wood is 120 years old. I am worried that it will get wet after I've stripped it all down to bare wood, paintshaver, and wanted to know how dry it has to get, i.e. moisture content, to avoid paint bubbling.
Not sure on moisture, but 8% is fairly dry and sounds reasonable.
The US Forest Service did testing on preparation of bare wood and found that once wood is prepped that it should be primed within two weeks. After two weeks the adherence of paint drops by an amount significant enough to be measurable.
Good to know, thanks!
You'd never get a chance to paint it here waiting for it to dry that much.
12-15%.
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Say it got rained on all day once I stripped the paint down to bare wood, and the next day was blue skies, 70 degrees, sunny and low humidity. Do you think a full day like that is enough for the wood to dry out sufficiently for paint?
Sorry if this is one of those impossible type questions.
Yes.but like somebody mentioned, the painters here will quit stripping each day about an hour or two before quitting time, and start brushing the primer on.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
As dry as nature will allow is the best you're gonna get it. If you get rain while wood is exposed, let it dry a couple of days before painting it.
Optionally, you could prime anything you expose at the end of each day.
~ Ted W ~
Cheap Tools! - MyToolbox.net
See my work at TedsCarpentry.com
Work in sections, can the primer be exposed for a few weeks so I can paint everything at the same time?
pprox 30 days exposure max
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
The biggest issue would be dust accumulating over time. I've left primer exposed all summer or winter, and none of it has failed that I know of. The trick is to sweep off the surfaces with a stiff broom before painting - especiall around ground level. Also, work the paint in well with the brush and/or roller.
If, by chance, you plan on spraying the paint, you shouldn't wait that long.~ Ted W ~
Cheap Tools! - MyToolbox.netSee my work at TedsCarpentry.com
Primer does lose it's "tooth" if left exposed for too long. Of course it's a gradual thing, so there's no one point in time when it suddenly becomes "too long".
As I stood before the gates I realized that I never want to be as certain about anything as were the people who built this place. --Rabbi Sheila Peltz, on her visit to Auschwitz
It's more than just dust accumulating ON it.UV degrades the surface of primer fairly fast so it chaulks away. Too much left from just sweeping will make for a bad bond with the new finish coat.But if he is using one of the self priming paints, that should nowt be an issue as much
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
One very important question is what kind of paint is being used. If latex then a little moisture is actually a good idea.
thinking of this one:http://www.sherwin-williams.com/do_it_yourself/sherwin_williams_products/products/resilienceext/index.jsp
What about primer?
As I stood before the gates I realized that I never want to be as certain about anything as were the people who built this place. --Rabbi Sheila Peltz, on her visit to Auschwitz
I'll call SW and ask someone there which primer is best given my location and weather conditions.
Tell them we all said hello!~ Ted W ~
Cheap Tools! - MyToolbox.netSee my work at TedsCarpentry.com
Just got off the phone with SW, primer:A-100¯ Exterior Oil Based Stain Blocking Primer
A-100 Alkyd Wood Primer * Ideal for exterior wood and plywood siding and trim
* May also be used for masonry and cement composition panels
* Blocks stains
* Inhibits mildew growth * How to use this product
For those you want the wood to be reasonably dry.You should check the labels for the recommended max time before applying a top coat.
As I stood before the gates I realized that I never want to be as certain about anything as were the people who built this place. --Rabbi Sheila Peltz, on her visit to Auschwitz
Do you have a preference between Benjamin Moore and Sherwin? Read a post regarding Sherwin Duration, same enviroment, and 10 years later looked new with power washing.
I've always used BM, but I don't disbelieve that SW is just as good. Those are the only two brands I really trust, though, since I don't use the stuff daily so I can't keep track of how the quality of the others rises and falls.BM easily lasts ten years in our climate, and I would expect SW to do the same.
As I stood before the gates I realized that I never want to be as certain about anything as were the people who built this place. --Rabbi Sheila Peltz, on her visit to Auschwitz
Personally,I hae long been a BM fan, but am impressed with the latest from SW more.My BIL is a painter and he has switched to SW for exterior paints.
the Store guys here tell me SW has another paint other than Duration similar to it for older work like you have.Seems that the Duration dries so fast, it can occasionally pull up old paint under it. The other product is a bit slower drying, something I would want in hot weather down there anyways. I think the name is Renewal or something like that.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
The name is Resilience, I have a link to it earlier in this thread. I was just telling Shep in another thread, I can get the BM at a 40% discount but would prefer to spend the extra bucks if the SW was better. I'll be real meticulous with the prep, so whatever I choose won't fail because of that.
Doc... I wouldn'd worry too much about moisture if you are working in the summer. A day or so of summer sun will dry the bare wood enough for paint. 15 years ago, I stripped 2 sides of my house (Cedar shingles) completely before going back to paint and thus it was exposed to a lot of rain over a couple months. When it was time to paint, my only test was that it was dry to the touch. BM oil primer and acrylic top coat, 2 coats of each. 15 years later it still looks great. When I did the rest of the house, I wised up and painted as I stripped...much more efficient, less moving of ladders and staging.