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Notching load bearing wood stud wall
May 29, 2019
12:37 pm
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fgrable@iccsafe.org
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I understand that "not in the 1/3 middle" sounds like a joist limitation....but none-the-less, it was on an AWP presentation slide for stud notching. 

I can see that limitation from an engineering analysis perspective of axial loaded pin connected ends column...the greatest bending moment is in the middle.  But that is getting a little deep for this question.

MAYBE (and I am just guessing here) that a stud really does have the reserve capacity (when used in accordance with the code rules) to have a reduced depth for it's whole length. Of course, you wouldn't be able to put holes through the stud...  Considering that sometimes load bearing studs have 40% sized bored holes in multiple locations does give one the idea that there is some reserve capacity there. 

May 24, 2019
7:32 am
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wyager@christiansburg.org
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Thank you for your input on this.

What you are saying about the middle 1/3 sounds like a joist more than a stud. 

I really wonder why the code does not address this.  I mean, you could notch a 92" stud virtually 91", reducing the width from 3 1/2" to 2 5/8".  That is a significant difference.  Granted, this is not a common practice, in my whole life of construction this is the first time I have run into this.

May 21, 2019
10:36 am
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fgrable@iccsafe.org
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Sorry, I read BWP as BMP. I probably would have figured that out. 

The other question I get is "how close can the bored holes be to each other?" 

I was looking at a presentation by an American Wood Products representative which indicated that notching of studs should only occur at the ends 1/3 of overall length. Not in the middle 1/3. But the code doesn't reflect this. (Nor do I know that the AWP presentation is actually correct). 

Both are good questions for someone intimately familiar with the design practices of the wood design manual. 

May 21, 2019
7:48 am
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wyager@christiansburg.org
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Sorry, BWP stands for Braced Wall Panel.  There are (2)  of these 10' panels along the 36' wall.

This is a 3-story townhouse but it is slab on grade.  They used CMU's instead of concrete or monolithic slab.  The adjoining unit is at a higher(or lower) elevation.

I am totally familiar with the code books.  I have been a building inspector for 12 years.  We are in Virginia, still under the 2012.

I understand what the code says about notching and drilling.

Your last statement is exactly why I threw this out there, if anyone has run into this before.  Also hoping some RDP's might address this.

It just seems unusual for a load bearing wall, carrying two floors, and being a braced wall panel, and part of a two hour rated assembly could be notched to this extent.

Thanks for your input.

May 17, 2019
4:15 pm
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fgrable@iccsafe.org
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Not everyone will be familiar with "BMP".  What does this mean?  Bottom wall plates? But the 10' length confuses me.

Reading between the lines, this sounds like a 3 story townhouse that is partially below grade (hence the CMU wall where the studs are notched.)

Normally, this would be an IRC building (just to make sure you are looking in right the code book).

IRC Section 602.6 applies  (2018 edition section number reference.)

See #2. if there are any holes through studs in the length where the studs are notched, then it is not compliant.

The notch depth has to be perfect: no overcut (depth) of the 7/8"

Otherwise, the code doesn't indicate the maximum length of a notch on a wood stud.

May 14, 2019
12:54 pm
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wyager@christiansburg.org
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Code quizzler -

Scenario - Townhouse. Part of 2hr. assembly. Bottom level 2 x 4 wood framed wall. No sheathing, just single side gyp board. Carrying two floor loads.  Wall is 36' in length with two 10' BWP's. 

Issue - All the studs along the entire length wall have been notched 7/8".  The notch begins at the bottom end and extends approximately 18" in height.  They were notched to go passed CMU foundation wall.

Question - What is the maximum length of allowed notch in these studs?  What if there were only say two studs?

Thanks ConfusedConfused