Fly Ash

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is a common ingredient in concrete just about everywhere. It is inexpensive and plentiful. Most is a byproduct from coal fired power plants.

It's very common in hot climates as it makes the job easier to finish.

I doubt the fly ash would harm the modern plastic tubes.

Typically fly ash from high sulpher content coal could be an issue with older steel and copper tube radiant systems. But only if it was in a wet location would the ash get aggressive towards the ferrous metal, or copper.

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Alan(OnVacationInOregon)Forbes

Fly Ash

is what the architect wants to use in the concrete slab in a "Green Building" project here in Berkeley. I'm concerned that it might be caustic and damage the PEX tubing. Should I tell them no?

jp_2

manufacturer say?

whats the manufacturer say? go to the horses mouth!

off hand I would think that only solvents of similar chemical composition will degrade pex, along with sun light.

Steve Ebels_3

I would do this

Find out from the architect what percentage or at what concentration the ash is going to blended into the mix. Then check with your tube manufacturer. I don't think it'll bother the pex but any metals in contact may present some issues.

Alan(OnVacationInOregon)Forbes

Fly Ash

Thanks, guys. Much appreciated.

Seattle Nick

The fly ash

content makes a difference if the owners are going to use an acid stain finish on their concrete...so I am told by the Kemiko rep. anyway FWIW

Nick

Arthur

Boy, you would have to get a hellva lot of flies to make much ash wouldn't you? I'd imagine a fly when burn would make much ash.