Blocks under tires

[machman72]

I would have to agree with Paul. The concrete leaches the moisture out of the tire material. I have been in the construction industry for 15 yrs. We have to place a vapor barrier on the ground before concrete is poured as the concrete will suck moisture up out of the ground. It does the same from the top down. Concrete is a porous material and attracts and holds water. This is one of the reasons rebar and wire mesh will rust inside of concrete. It is slow, but it does take place. If water is gathering inside of a tire and damaging the steel belts, this is more than likley due to condensation, not leeching. The concrete area covered by the tire keeps this portion of the tire cooler than the rest that is subject to hotter direct sun and air, thus condensation. Same reason HVAC ducts will sweat if not well insulated. Oh and don't forget the moisture that gets put in your tires every time you put air in them. There is moisture inside the air tank and it goes straight into your tires.

[NeilV]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by machman72:
I would have to agree with Paul. The concrete leaches the moisture out of the tire material. I have been in the construction industry for 15 yrs. We have to place a vapor barrier on the ground before concrete is poured as the concrete will suck moisture up out of the ground. It does the same from the top down. Concrete is a porous material and attracts and holds water. </div></BLOCKQUOTE>

My father was a manager at Tyre Rubber and Roll for over 40 years and this blurb from a tire care site pretty much matches what he always told us:

"When a tire is manufactured, a stabilizer molecule is added to the tire polymer. This molecule is called a "competitive absorber"� and will work to protect against ozone and UV damage by capturing and absorbing UV radiation and converting it to heat which is dissipated harmlessly. Carbon black is the "competitive absorber"� all tire manufacturers use. This is why tires are black, not a color to match your car or your taste. Ozone, a part of the air, combined with sunlight, causes the degrading of rubber tires which results in dry rot, discoloration, cracking and splitting."

So when you park on concrete especialy in a hot climate you accelerate the loss of the tires moisture and the carbon black through the absorptive properties of the concrete and the thermal dynamic flow of heat from the warmer tire to the cooler concrete below. This loss of the "competitive absorber"� then leave the tire more vulnerable to ozone damage and dry rot.

[Steady Eddie]

Good Evening--

Here's another link:

http://www.rangerdesign.com/RangerDe...dingStrips.htm

Its' text perhaps explains the absorption of moisture INTO

the tires better the the World Famous "Shade Tree Mechanic" of

the TV Show of the same name.