CMU Fire wall separations

[pmetz]

Issue: Specifying a poured concrete beam between dwelling units while maintaining the fire separation.

Construction: CMU with wood truss roof system. Two story building.

Condition: A portion of the poured beam is horizontal and the peak of the roof system is in the center of the beam, when viewed through its section. (The beam needs to be pitched, from its centerline to follow the roof pitch)

Question: Does anyone have a recommendation how to specify this or detail this situation? Or recommend a manual that would show how to form and build this type of wall.

 

[SperlingPE]

Explain the part about fire separation. Is the beam the line of separation? Does structure from both side bear on the beam?

Instead of a pitched top beam, can you embed steel supports at the top of the beam to support the pitched roof system?

 

[pmetz]

The fire wall separates the units. There are no structural members bearing on the top of the wall. The sheathing from the roofs on either side come to a peak at the mid line of the beam.

I understand your recommendation regarding the the embedded supports. But what I am really after is how to pour the beam and bevel it so that the sheathing lays with no gap between the materials in order to maintain the wall continuous to the bottom of the sheathing meeting the fire wall separation requirements. I don't see any reason why a good mason cannot form the beam, pour it and put a ptich on it. Just wondering if there is a standard way of doing this?