• Welcome to The Building Code Forum

    Your premier resource for building code knowledge.

    This forum remains free to the public thanks to the generous support of our Sawhorse Members and Corporate Sponsors. Their contributions help keep this community thriving and accessible.

    Want enhanced access to expert discussions and exclusive features? Learn more about the benefits here.

    Ready to upgrade? Log in and upgrade now.

Typo in Table 720.1(2)

Is not 2x6 lumber actually 1 1/2" x 5 1/2" and a 2x8 actually 1 1/2" x 7 1/4"?
 
There is a change bar in the 2009 edition, which identifies the 7.75-inch thick assembly as 2-hour FRR. The 2006 also has a change bar and places the 4.5-inch thick assembly in the 1-hour FRR column. The 2003 also has change bars, and 2003 Item 15-1.15 looks similar to 2009 Item 15-1.16. Maybe there is an errata for the 2006 edition, but can't check the ICC site since it's down!
 
Yikes said:
Well, as long as it's fixed now, that's the important thing.
Click to expand...
Well ... they almost fixed it in the 2006 errata. Here's the change:

"2” x 6” wood studs at 24” centers with double top plates, single bottom plate; interior and exterior side covered with two layers of 5/8” Type X gypsum wallboard, 4’ wide, applied horizontally with vertical joints over studs. Base layer fastened with 2-1/4” Type S drywall screws, spaced 8” on center, wallboard joints covered with paper tape and joint compound, fastened heads covered with joint compound. Cavity to be filled with 5-1/2” mineral wool insulation. (posted 7-1-06)"

What they didn't change for the 2006 edition was the minimum thickness of 4 1/2" for 1 hour rating. But, the construction description fits.

For the 2009 edition the rating was increased to 2 hours and a minimum thickness of 7 3/4". But since the construction thickness totals 8" it fits the minimum also.

:confused: I really don't understand the relationship of the minimum thickness and the actual thickness of the construction as described. Unless it has something to do with footnote e to the table which allows gypsum base and plaster substitution.
 
You must log in or register to reply here.
Back
Top