Gambrel Section

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Gambrel Section















8' high ceiling
(adjust as desired)
Truss framed gambrel roof. Trusses 24"
o/c. Made from 2x8 (sidewalls) and 2x6
upper gable. Ceiling joist 2x8 (all D/F #1).
All angles are either 60� or 30�. Layout
on floor deck to actual measured
dimensions. Install � plywood plates at
ridge and joint. Test 1
st
truss then use as
template.
In this example the upper floor is
24' wide and sits on 2x6 walls
below.
Gambrel Section
No Scale
2x4 eave extension
added to truss.
2x4 vent blocks allow air
in at bottom
ACX plywood at open
eaves.
Vent baffle to keep 1"
ventilation channel abv.
insulation.
Trusses @ 24" o/c
attach to floor system w/
A35 anchor. 2x4
blocking between
trusses.
2
nd
floor structure.
Insulate @ rim.
Eave Extension
Scale 1"= 1'-0

Provide ridge vents at peak and airflow
from eaves to ridge.

Gambrel Roof Details
2004 � countryplans.com
1 of 2
Note:
Adjust this structural
configuration so it is
appropriate for your spans
and local wind, snow and
earthquake loads. Consult
your local building department
or a structural engineer.








Truss connection with 1/2" plywood and
glue both sides or manufacturer splice
plates. (Similar plate at peak.)
2x4 blocking/nailer. (Drywall clips at wall)
2x8 sidewall
Roofing shingles with flashing over
sidewall roofing at joint.
Continuous vent baffle to above attic
insulation.
2x6 upper gable rafter
Full attic insulation (12" shown)
2x8 ceiling joist (adjust for span)
Alt. Flared Eave Extension
Scale 1" = 1'-

0
Vent baffle open to soffit vent
Trusses @ 24" o/c attach to floor
system w/ A35 anchor.
Block between trusses w/ 2x4. Nail
structural wall sheathing over
blocking and into truss 2x8.
Flash roofing onto eave extension.
2x6 extension to truss w/ 2x4 and
plywood soffit w/ ventilation strip
below.
2x8 cedar facia
Truss Joint at Ceiling
Scale 1" = 1'-

0
Gambrel Roof Details
2004 � countryplans.com
2 of 2