Jump to content

Multiple Foundation Cracks


Recommended Posts

I have never seen so many poured concrete foundation cracks in a single home - vertical, horizontal, diagonal. It was like a jigsaw puzzle. 30 yr old house. Many were epoxy injected but not all. Except for some minor inward bulging at a couple places, the foundation was dead-on plumb. No noticeable problems upstairs.

Thoughts as to why this occurred? Too soupy a mix?

Click to Enlarge
tn_20163212914_DSCF9803.jpg

22.72 KB

Click to Enlarge
tn_20163212933_DSCF9809.jpg

27.67 KB

Click to Enlarge
tn_20163212947_DSCF9822.jpg

28.68 KB

Click to Enlarge
tn_20163212104_DSCF9826.jpg

27.36 KB

Click to Enlarge
tn_201632121023_DSCF9828.jpg

27.91 KB

Link to post
Share on other sites

Concrete that is too wet can create a lot of cracks, but it looks like more is going on there. It appears that there is a horizontal joint near the top of the foundation wall. I see that when they use 8-foot forms and want a foundation wall 9 or 10 feet high. There may have been a cold joint there, especially if adding height was an afterthought (excavated too deep, owner changed their mind).

The random cracking is too closely spaced for typical shrinkage cracks. I have seen that before when the foundation was backfilled too early, as John said.

Link to post
Share on other sites

Possibly a poor mix, too wet, could have been poured with the temperatures too low, the concrete is hot when you pour but if it got down into the teens that night you can have freeze spots that turn into cracks. Won't show up for years. Can also be that the rebar was rusted, did you see any spalling? That is usually the rebar (reinforcing rods).

Link to post
Share on other sites
  • 4 weeks later...

Possibly a poor mix, too wet, could have been poured with the temperatures too low, the concrete is hot when you pour but if it got down into the teens that night you can have freeze spots that turn into cracks. Won't show up for years. Can also be that the rebar was rusted, did you see any spalling? That is usually the rebar (reinforcing rods).

I would suspect a hot mix.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...