Type IIIB Exterior Wall Lintels

[Hyrax4978]

I am looking at providing a small IIIB project and based on table 601 and 704.10/704.11 it appears as though an overhead door lintel would be required to be 2 hour rated. So if we have a 14' overhead door, the lintel at that opening would need to be 2 hour rated. While i guess i could opt for a type V construction, it got me wondering how most IIIB buildings would handle this. Not a huge fan of intumescent paint. precast?

 

[steveray]

I am looking at providing a small IIIB project and based on table 601 and 704.10/704.11 it appears as though an overhead door lintel would be required to be 2 hour rated. So if we have a 14' overhead door, the lintel at that opening would need to be 2 hour rated. While i guess i could opt for a type V construction, it got me wondering how most IIIB buildings would handle this. Not a huge fan of intumescent paint. precast?

I would think precast....But I have not actually seen it...

 

[RLGA]

First, is the wall a "bearing wall structure" per the IBC definition? If not, then the requirements of Table 601 don't apply, and the requirements of Table 705.5 would only apply if the fire separation distance requires a fire-resistance rating.

If the wall does require a fire-resistance rating, then, based on the span, Section 704.11 would require the protection. But you could also use a precast lintel (as mentioned above) or a masonry lintel (either prefabricated or constructed in-place).

 

[Yankee Chronicler]

I am looking at providing a small IIIB project and based on table 601 and 704.10/704.11 it appears as though an overhead door lintel would be required to be 2 hour rated. So if we have a 14' overhead door, the lintel at that opening would need to be 2 hour rated. While i guess i could opt for a type V construction, it got me wondering how most IIIB buildings would handle this. Not a huge fan of intumescent paint. precast?

What is the wall constructed of?

 

[Dinheru]

If traditional 3B masonry: If exposed we use intumescent paint, other option is to brick it in.

 

[RLGA]

If traditional 3B masonry: If exposed we use intumescent paint, other option is to brick it in.

A word of caution about intumescent "paints." Some intumescent "paints" only improve performance under ASTM E84/UL 723 and are not approved for performance under ASTM E119/UL 263. I prefer to use "paints" for the former and "fire-resistant coatings" (as defined in IBC Chapter 2) for the latter.