Venting and Drainage Hole Placement and Dimensions for Pipe Truss 3” (8 cm) & Larger
Vertical Sections
Hole locations for the vertical members should be as shown in Examples A and B.- Each vertical member should have two holes at each end and 180 degrees apart, in line with the horizontal members as indicated by the arrows. The size of the holes preferably should be equal and the combined area of the two holes at either end of the verticals (Areas C and D or Areas E and F) should be at least 30% of the cross-sectional area.
End-plates – Horizontal
- The most desirable fabrication is completely open with the same hole diameter as the tube’s internal diameter.
- Equal substitutes would have openings as shown and would be at least 30% of the area of the internal diameter.
