Installation guide

15
4. Drill joists (if necessary)
• Drill in accordance to structural requirements. To help keep the holes
inline,itmaybehelpfultorstmarkthejoistswithachalkline.
• If the supply and return sections of the circuit are to be installed
through a common joist transition point, a 1-3/4" (44.4 mm) hole is
required (option 1). If the supply and return sections are to be run in
dedicated transition points, 1" (25.4 mm) holes can be used (option 2).
• If using TJI joists, it may be possible to use the pre-fabricated
knock-outs instead of having to drill transition points. Make sure
the knock-outs are large enough for the tubing before proceeding.
Frame Floor Section - Manifold Installation
Under Floor Joist Penetration Detail
Ø 1-3/4"
(44.4 mm)
Option 1
Option 2
Under Floor - Manifold Installation Detail
Whencrossingajoistataperpendicularangle,itisrecommendedtofollowBOCA
2305.3.2 guidelines for allowable joist penetrations.
Penetrations can not be closer
than 2" (50.8 mm) to the top
or bottom of the joist.
2" (50.8 mm) minimum
spacing between penetrations.
center linepenetration zone joist height
max. bore size: 1/3 joist height
Stayamin.of8"
(203.2 mm) from
end of joist.
BOCA Joist Penetration Guideline