I need some advice. We just built a deck out of the green pressure treated
wood. Part of the deck is under a roof and the other is in the sun. I have
heard some pro's and con's about Thompson's. If I leave it untreated in a
few years the part in the sun I think will look weathered is this right.
Should I be putting water seal on it. I don't want to stain it with a
Any advice would be appreciated
IMHO there is not a sealer/protectant that will protect from the sun for
more than a year or two. The sun is going to do more damage than the water.
The wood tends to be more tolerant of the suns rays than any sealer used on
it. This is going to be an on going job regardless of what product you use.
I have a deck with partially covered areas and non covered areas. One part
in the shade gets wet daily from the daily Heavy morning dew in Houston.
Other vertical parts that are exposed to the sun stay dry. The wood exposed
to the sun is what looks go be in worse shape than that that gets wet daily.
This deck is pressure treated and 21 years old. I applied 1 coat of
Thompson's sealer immediately after building the deck and nothing since.
Oh No, here we go again.
Snipped from Thompsons web page: "Advanced waterproofing protects your
investment and exceeds industry standard ASTM D-4446 for waterproofing wood.
Standards? what Standards?
Big Grin !!
The original TWS was essentially paraffin wax dissolved in mineral
spirits. No UV protection. Not sure about the new and improved.
A few years back Consumer Reports did a long term study on similar
products, including UV protection, waterproofing, etc. If you could
find it in your local library it might be helpful.
Gerald Ross, Cochran, GA
To reply add the numerals "13" before the "at"
We had a home built about five years ago. Our deck is constructed with
pressure treated wood and while it is under a roofed area, it has south
exposure and gets quite a bit of sun. Our builder did a couple of things
that appear to have paid off:
1) Suggested we not treat it with anything for at least six months. He
wanted to let the moisture bleed out of wood via exposure to sunlight before
2) He gently steered us away from Thompson's. He admitted it was partly an
appearance thing, but he preferred Olympic Water Guard. He also thought
Olympic had more staying power. He said to plan on washing and retreating
about every other year. However, based on your comment you might not want
to use Olympic because it does add an amber tone to the wood.
We followed his advice and are pleased. At the end of six months the deck
had sun bleached slightly. I cleaned and sprayed two coats of Olympic which
gave it a slightly amber look. Both of my subsequent retreatments were
preceeded with a light pressure wash using deck cleaner. These subsequent
treatments were done with a brush (one coat), which I believe does a better
job than spray. Again, the deck will retain a golden brown appearance which
you might find objectionable.
By comparison, I built a deck at a previous residence and used Thompson's.
I can't say that Thompson's provided a bad finish but it added absolutely no
color to the wood. It was like brushing water on - at times it was
difficult to tell where you had treated. We sold the house before we could
see how it aged. As far as cost goes, they are both in the same ballpark.
I belive Thompson's has been running a "5th quart free" sale for the past
3-4 years - Still talking about $12-14 dollars for a 5 quart can.
I've never heard a good recco on it...just lots of ads.
I use a Cabot oil stain (3002) every year or two. After the first year,
using clear helps keep it lighter. That's the cedar number. I don't know
Behr is making some with silicone, supposedly longer lasting...from HD.
Be careful of wet deck for a while after application...it can be slick until
soaked in and worn a bit. I let it have all that will soak in...western red
cedar...seems to be holding up ok.
Are there any similar products for protecting
All-weather materials? I have a deck made of WeatherBest material,
one year old and already it is dirty, and needs a power wash.
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