Concrete block efflorescence remedy

[rmanrman]

My 8yr concrete basement block wall is getting fuzzy with efflorescence. Can’t dig outside because there’s a sidewalk up to foundation
To add problems the sidewalk about 20 feet is slopped to the house. Mason used a 20 year old level I guess. What I did two years ago was apply drylock water base (can’t get oil based in Nj)
I will scrape and sand as much as possible
Is there a better product to waterproof that wall? The garage is next to this wall and no water in garage. We did get a lot of rain late 2023 and about 15 inches of snow so far.
Could I possibly use hydraulic cement on the whole wall ? Thanks

 

[The Cobbler]

efflorescence comes from the outside in. not much you can do internally to stop it, in my opinion.

 

[Stuart in MN]

Agreed, you have to stop the moisture on the outside. Fix the sidewalk that slopes to the house.

 

[Rusty Wrench]

There was efflorescence on my basement block wall when I purchased it. On the other side is sod. I washed the wall with muriatic and painted the wall with dri-lock. 18 years ago. No return

Dri-lock doesn't withstand a lot of hydrostatic pressure but if it's only a damp wall it may work for you. I say only damp because guessing you have footer drains to carry water away if only 8 years old.

2 years ago I paid $800 to raise sidewalk sections by injection. Different house- it was to remove trip hazard for point of sale requirement. Think there were 8 or 9 sections involved. Northeast Ohio.

Oops... didn't see you'd tried dri lock

 

[bb29510]

efflorescence is the salt bleeding out of the mortar, to stop it, you got stop the moisture

 

[strutaeng]

Agreed. Efflorescence is the result of water getting into the masonry...the water intrusion has to be stopped from the other side.

It's a sidewalk. Bust it up and it can be repoured. Regardless, even if you have good drainage away from the building, your basement Wall's waterproofing has failed. So it needs to be replaced. The excavation is the the real expensive part, I would imagine.