2006 IRC Masonry Thread?

[RARWOOD]

I thought someone had posted a thread on the support of concrete and masonry under the 2006 IRC code.

I tried searching for one with out much luck.

If I remember the thread correctly some one was asking about the restriction against supporting the dead load of concrete and masonry with wood members. They seem to indicate that the traditional restriction against wood supporting the dead load of masonry which was common in the UBC, can not be found in the 20076 IRC.

I was asked the same question today. Looking through the 2006 IRC I could not find a section that specifically prohibited the use of wood members to support of the dead load of masonry and concrete.

My response was, that the IRC is more of a prescriptive code. The IRC tells you what is allowed.

 

[structuralaggie]

IBC 2003 2304.12 states clearly that you can't support masonry or concrete on wood except for a few exceptions. This same section in the IBC 2006 doesn't make it sound like there is anything wrong with supporting masonry or concrete on wood. I don't know if it has just been put somewhere else or what. The IBC 2003 is the adopted code in my area, so I guess I won't worry about it for now.

This seems to be a divided issue. From what I read in the IBC 2003 2304.12, there is no way you should do it. I am interested in what happened in the IBC 2006 code if anyone knows.

 

[RARWOOD]

Thank you for your input. At this time I am only looking at the IRC. It is interesting that the IBC also doesn't address this.

As I indicated I thought there was a thread that talked about this.

I was reading one thread that seem to indicate that the restrictions of supporting masonry and concrete were based on recommendations from those industry.

The 2006 IRC seems to indicate that if a wood floor is designed to carry interior brick then it is acceptable.

I always understood that the prohibition against carrying the dead load of concrete or masonry was based on long term creep problems with the wood and a concern of the masonry falling on fire fighters during a fire.

I am a wood person, however I shy away from the thought of carrying precast plank with glulam beams. When one thinks about it however during a fire a glulam is probably going to be carrying the load of the precast long after a steel beam has failed due to the heat.

 

[JAE]

RARSWC

I don't have the 2006 IRC but in the 2000 IRC there is a figure R703.7.1 that shows brick veneer supported by a steel angle which is in turn supported by wood studs.

That was the topic of the thread as I remember it.

 

[JAE]

Here's the thread I remember about it:

thread507-106057

 

[structuralaggie]

I don't have the IRC, but doesn't it just reference the IBC for a lot of things?

The IBC 2003 2304.12 states some exceptions, like interior brick, floor and roof coverings 4" or less, veneer on treated wood foundations, but that is about it. The deflection thing is in there too.

I think the main reason is the fire fighter thing. That is why I am concerned that the same section in the 2006 IBC has all the restrictions removed that was there in the 2003 edition. I suspect that it has been put somewhere else, but I have not looked too hard for it. I am sticking with the 2003 IBC for now.

 

[RARWOOD]

Thank You JAE.

 

[LowLax]

I pretty sure it's in the veneer section of ACI 530.