Home Improvement Questions? Ask a Handyman for Answers ASAP
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Obviously you still have moisture passing through the mortar at this point and leaching the effloresce to the inside surface. Short of waterproofing the exterior the only other thing with might solve your effloresce would be a parge coat of mortar. Clean the existing brick and mortar with acid first and rinse.
Another option is move the stairways inside wall away from the outside wall to get the width you need to do the foam/vaporbarrier/wallboard.
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