Knot cracks in joists and beam


Old 01-05-18, 07:03 PM
Thread Starter
Join Date: Jul 2010
Posts: 23
Received 0 Votes on 0 Posts
Knot cracks in joists and beam

I ripped up the drywall in our basement (supposedly built 20 years ago or so, but definitely built over 5 years ago) this summer. I remember inspecting the kiln wood joists and they all looked in great condition.

However, during this winter it seems like there has been some checking and cracking going on through the wood.

First issue:

I have a very long crack going through a spiked knot in a floor joist and the knot appears to be existing across the entire joist:

Name:  Joist crack spiked knot.jpg
Views: 674
Size:  92.1 KB

it appears the crack is affecting the other side of the joist as well:

Name:  Spiked knot other side.jpg
Views: 596
Size:  87.4 KB

The builders used 4 floor joists together as the load bearing beam. it appears one of the joists that form this beam has a knot crack that is at least 1-2 inches deep. However, i cant see how far up it really goes (for now, i put a temporary jack post there):
Name:  Beam knot crack.jpg
Views: 672
Size:  93.6 KB
Name:  Beam knot crack 2.jpg
Views: 561
Size:  97.0 KB

Lastly it appears that my bridging boards along the walls have checked along the nails and popped:

Name:  cracked blocks.jpg
Views: 616
Size:  81.2 KB
Name:  cracked blocks 2.jpg
Views: 671
Size:  91.5 KB

Any recommendations on how i deal with this?

Sponsored Links
Old 01-05-18, 07:14 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 25,996
Received 667 Votes on 617 Posts
Wood will crack, it's not surprising. Since your crack in your first photo has not even reached the other side of the wood, it is nothing to worry about.

The little crack at the knot in your 4 member beam is also very minor, nothing to worry about and you definitely do not need a post there.

The boards in your final pictures are not structural and could be removed completely. Looks like someone tried to bust them out and gave up and left them. They look like they may have been put there as blocking (it's not bridging) for a wall top plate (or maybe drywall) at one time, which has since been removed. Also not an issue.
Old 01-06-18, 03:14 AM
Marq1's Avatar
Join Date: Sep 2016
Location: USA MI
Posts: 6,527
Received 367 Votes on 342 Posts
Would have to agree, nothing I see in the pictures is exceptional or anything that I would consider repairing/replacing.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: