Technical Specifications

P. 1 4
Cantilever Details for Interior Balconies (No Wall Load)
FIGURE 3
Balconies may be constructed by using either continuous P3 Joists (Figure 3) or by adding lumber extensions
(Figure 4) tothe P3 Joist� Continuous P3 Joist cantilevers are limited to one-fourth the adjacent span when
supporting uniform loads only� For applications supporting concentrated loads at the end of the cantilever such
as a wall, see Figures5a and 5b�
Unless otherwise engineered, cantilevers are limited to a maximum of 4’ when supporting uniform loads only�
Blocking is required at the cantilever support as shown�
Uniform floor load shall not exceed 40 psf live load and 10 psf dead load� The balcony load shall not exceed 60psf
live load and 10 psf dead load�
Lumber Cantilever Details For Balconies (No Wall Load)
FIGURE 4
NOTES All nails shown in the details above are assumed to be common nails unless otherwise noted� Individual components are not shown to scale for clarity�
1-1/2 x L
4’ minimum
L
4’ maximum,
where
L is length
of
cantileve
r
Attach P3 Joists to plate at all
supports per Detail 2b�
Full depth backer block with 1/8” gap between block and top flange of P3 Joist
See Detail 2h� Nail with 2 rows of 10d nails @ 6” o�c� and clinch�
Cantilever extension supporting
uniform floor loads only
2 x 8 min� Nail to backer block and joist with 2 rows of 10d
nails @ 6” o�c� and clinch (Cantilever nails may be used to attach
backer block if length of nail is sufficient to allow clinching)�
P3 Joist or APA Rim Board
3-1/2” min� bearing required
Lumber or wood structural panel closure
L/4
4’ maximum,
where
L is
joist span
Attach P3 Joists to plate at all
supports per Detail 2b�
Cantilever extension
supporting uniform floor
loads only
APA Rim Board or
wood structural panel
3-1/2” min� bearing required
CAUTION
Cantilevers formed this way
must be carefully detailed to
prevent moisture intrusion
into the structure and
potential decay of untreated
P3 Joist extensions�