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structural beams
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structural beams By  Freespirit

Posts: 1

11/13/2011 10:11:23 AM

I have been trying to find info, in the IRC concerning exposed supporting beams & flashing requirments.

We have been seeing more and more support beams extending beyond the roof lines and decks.

I thought I saw it in the past but sure can’t find it now.

Does anyone idea where it would be

 

Thanks

 Freespirit

31 002.JPG   

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   Edited By Freespirit at 11/13/2011 10:31:13 AM.

structural beams By  Joshua States

Posts: 14

11/14/2011 11:00:48 AM

Welcome to the forum.

I don't believe that there is a specific reference to the circumstances you show, however, R703 covers exterior wall coverings, flashing, etc. The closest thing I can find to requiring flashing in the photo you provided is R703.3.1 which covers the junction of the log-beam to the exterior wall. (with 3 ways of closing that joint)

As for the juntion of the log to the fascia, R703.8 covers Flashing and the required locations. This specific circumstance is not addressed, but the code does require flashing " to prevent entry of water into the wall cavity, or penetration into building structural components" and #4 of the same section requires flashing "continuously above all projecting wood trim."

While it may be a stretch to call that beam end a piece of "wood trim", it can certainly be considered a structural component worthy of water protection.

Hope that helps,

Josh

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structural beams By  Dennis Keierleber

Posts: 366

11/17/2011 12:48:41 PM

I don't know if the IRC covers that but it is definitely in the IBC. I think one is justified in referring to the IBC where the IRC is not specific. In any case, you could add a department policy for your jurisdiction.

2304.11.5 Supporting member for permanent appurtenances. Naturally durable or preservative-treated wood shall be utilized for those portions of wood members that form the structural supports of buildings, balconies, porches or similar permanent building appurtenances where such members are exposed to the weather without adequate protection from a roof, eave, overhang or other covering to prevent moisture or water accumulation on the surface or at joints between members.

Exception: When a building is located in a geographical region where experience has demonstrated that climatic conditions preclude the need to use durable materials where the structure is exposed to the weather.

This is sort of addressed in the NDS where it says that design values are for dry service conditions. The designer would have to account for the wet service condition in any case but the bigger problem is decay fungi. A better design would have been to have the roof overhang cover the ends of the beams. Water will infiltrate the open grain on the ends of exposed members. This is a bigger concern with glued-laminated beams than solid sawn or logs. Both the NDS and the IBC address glu-lams:
2304.11.3 Laminated timbers. The portions of glued-laminated timbers that form the structural supports of a building or other structure and are exposed to weather and not fully protected from moisture by a roof, eave or similar covering shall be pressure treated with preservative or be manufactured from naturally durable or preservative-treated wood.

DK Engineering PLLC
dkengineer.com

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