Efflorescence on the interior.

[Robert Jones]

My first time seeing this. Home built in 1983. The stack, concrete cap and rain hat are all in good shape. The interior bricks have efflorescence showing. The fireplace does have a heatilator. What would cause this on the interior brick?

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[AHI in AR]

My money is on seepage through the brick...even if it looks OK. Especially if the joints are raked, not tooled.

Could also be poor flashing details.

[hausdok]

Hi Rob,

Did you sound that crown to determine if it's fully adhered or did you just do a visual on it? How was the mortar where the counter flashings are let into the stack? Were there a set of shoulders on that stack that might have loose/cracked caps?

ONE TEAM - ONE FIGHT!!!

Mike

[Robert Jones]

Thanks guys,

It looks to me like the crown and flashing were replaced when the roof was replaced, approx 5 yrs or so ago. I have added another pic to my original post. There was no water staining etc... to the interior ceiling. The damper was a rusted, which is not to uncommon for 26 yrs.

[randynavarro]

There's the fact that cap most assuredly hasn't been on the flue for the last 26 years. . .

[Richard Moore]

Also...that reverse corbelling is stupid and sort of defeats the purpose of the mortar cap.