Block Foundation Help

[dj1701]

Hey everyone,

I have a block foundation that supports my back deck. It was fine when I
moved in 12 years ago, but it is crumbling in spots.
I what would cause this? How can this be fixed?

Thanks
Dave

 

[ovrszd]

Bummer. I've never saw that before. But I'm not a block guy.

Hopefully the experts will chime in with cause and solution.

 

[Diggin It]

Spalling. Same thing you see on sidewalks. Just age in some cases, but the blocks could have been bad from the start. Moisture encroaches and a chemical reaction starts. Only way I know to fix it is to break out any loose material and fill with new concrete. Then maybe coat with Drylock paint or a foundation coating.

What's on the other side of the block, do you know?

 

[747driver]

X2 with Diggin It. Plus probably over the years the freeze thaw cycle from snow and rain has weakened the block where it chips off. I think Quickcrete sells a mortar patch mix in like a gallon pail. HD and Lowes sells it. Before patching put a coat of concrete adhesive ( comes in a plastic quart bottle ) on the repair area....it lets the patching mortar adhere better.