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concrete block under steam boiler all of sudden seeing cracking, any ideas?

jestjestjestjest Member Posts: 1
edited December 2018 in Strictly Steam
Concrete block under steam boiler all of sudden seeing cracking, any ideas? seemed fine 2-3 months ago.
Don't get why its doing that.


Any input will be appreciated, thank you.


  • lchmblchmb Member Posts: 2,984
    my first guess would be heat.. looks like the boiler could use a cleaning..
  • STEVEusaPASTEVEusaPA Member Posts: 4,109
    Probably didn't use some WWF for reinforcement, combined with some settlement from not properly preparing before the concrete. IOW, they should've probably not put the slab on top of what is probably a 2" rat slab. It also looks like they may have used the wrong concrete.
    Unless the boiler is now out of level, or it dropped and is putting stress on the piping, I would just monitor to see if it gets worse.
    If it gets worse, you may have to disconnect the boiler, re do the pad (correctly we hope) and re-set the boiler. Or re-do the slab when you get a new boiler :)
  • nibsnibs Member Posts: 462
    The pad will probably serve for years more. While there are many things that can go wrong with concrete, and lots of uninformed opinions about the stuff, in that application it is not likely to turn to dust.
    If you need to site mix a pad or repair an inslab leak, add fiber to the mix, it is cheap and adds tons of strength to the cement. Measure the components accurately and use a minimal amount of water .
  • GordyGordy Member Posts: 9,523
    That cracking looks older than 2-3 months old.
  • ChrisJChrisJ Member Posts: 10,860
    Gordy said:

    That cracking looks older than 2-3 months old.

    Looks like decades old to me.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
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