Assembly Book

Revised April 11, 2024

the Mansfield - R 12' x 12'

Manufactured by RBS Holdings, LLC
205 Arlington Drive Greenville, PA 16125
This manual is copyrighted. Under the copyright laws, this manual
may not be copied, in whole or in part, without consent from
RBS Holdings, LLC © Copyright 2022
 IMPORTANT INFORMATION ABOUT YOUR KIT
Thank you for purchasing our kit. Please read the following information before beginning construction.
Always check with your local HOA or building code office for any requirements or restrictions.
Floor: Wood flooring is sold optionally. You may choose to build your own or pour a cement pad.
Always wear safety glasses when cutting or nailing!
Tools Required: Hand or Circular Saw Level Safety Glasses
Cordless Drill Measuring Tape Dust Mask
Hammer 6'-8' Ladder(s) Phillips Screwdriver
Pencil Framing Square

Additional Materials - Not included in kit:

Windows are purchased separately
Required: Shingles or metal roofing, Drip Edge, Roofing Nails or Screws, Paint
Optional: Caulk, Ridge Vent
Primed Siding Detail
Terminology:
Square - Confirm corners are at 90 degrees LAP Edge
Plumb - Confirm walls and trusses are straight vertically
Wall Plate - Top and bottom 2x4s used to frame walls
Tie Plate - 2x4s connecting wall sections together
Header - Spans top of door opening
OSB - Oriented Strand Board
LAP - Edge of siding that overlaps Tongue
Tongue - Edge of siding that is overlapped Tongue Edge

Organize:
Unpack all items & organize according to size and type. This will make items easier to find
when instructed.
Review the parts list on the back page. Should there be missing items or sub-par material
contact Best Barns Customer Service.
DO NOT discard any material including the pallet until your project is complete.
Assembly:
Review all instructions before you begin. Please follow steps carefully and in sequence for
successful results.
If you have any questions we are happy to assist you. Please contact us at:
800-245-1577 - Mon - Fri 8AM - 5PM EST
724-866-4357 - After hours and weekends
Email - questions@barnkits.com
 Constructing Details for Deluxe Floor System
Shown below is a typical wood floor. Depending on your area, the construction may have to be
changed to meet local codes. When using a concrete slab, use the same overall foundation
measurements. Install foam sill sealer as a moisture barrier between the concrete and the wall
plates. Foam sill sealer can be purchased at home centers in rolls 3-1/2" or wider.

1. Cut (2) two 2x4-12' joist headers to a length of 12 '- 0". Layout for 16" on center spacing.
'X' marks where floor joist will be placed.

2x4 Joist Header X X X X

X X X X
15-1/4" 16" 16"

2. Cut 2x4-12' floor joist to 11'-9". Treated lumber may be thicker than 1-1/2". Take this into
account when cutting the length of floor joists. Shorten joist measurements if necessary to
obtain 12'-0" building width.
12' -
0" Flo
th or Le
g Wid ngth
Buildin
- 0"
12'

DO
OR
WA
LL
4x8 Flooring
4x4 Treated Runners

2x4 Joist 11' - 9" Long

To keep 2x4 frame from

moving, toe nail to 4x4.
Material Description 12' x 12' shed
2x4 Joist Headers 2 pcs. 12'
2x4 Floor Joist 10 pcs. 12'
4x4 Treated Runners 4 pcs. 12' It is important that the floor be level and square.
Flooring 5/8" or 3/4" 5 pcs. 4x8 Before nailing the flooring, measure the floor
diagonally (corner to corner). Then measure the
Screw Floor Nails 2 lbs. 8d opposite corners. These measurements will be
Galv. Box Nails 1 lb. 16d the same if the floor is square.
Step 1 Assemble 12' Back Wall
Do not discard any material until construction is complete. Including short blocks of 2x4s.
1. Position 2x4-68-1/2" boards together and indicate with 'X' marks, where the wall studs
will be located. Mark the ends that will butt together with the letters 'A' and 'B'.
68-1/2" Wall Plate 68-1/2" Wall Plate
X X X A B X X X
X X X A B X X X
19-3/4" 24" 23-1/4" 24"

68-1/2" Wall Plate

B
A

2x4-72" Wall Studs

2. Install (8) eight 72" wall studs between the top and bottom plates. Usd 10d sinkers, (2) two
nails at each stud end. Nail both wall frames together with 10d sinkers.
3. Square wall frame. Measure diagonally (corner to corner). The measurements will be the same
when the wall is square.
4. Install the first siding panel with the 'LAP' edge extending 3-1/2" past the wall frame and 3/4"
below bottom plate. Use 6d galv. nails spaced 8" apart. Tip: Use 3/4" trim board as a gauge.
5. Install (2) two more siding panels. Cut the last panel to extend 3-1/2" beyond the wall frame.

LAP
Edge
/4”
t e nd 3 e
x plat
to e
AB
i d ing bottom
S ow
bel
Siding Extends 3-1/2"
Past 2x4 Stud
Step 2 Assemble 12' Long Sidewalls
1. Gather (4) four 2x4-72" boards and position together then indicate with 'X' mark where the
wall studs will be located. Mark the ends that will butt together with 'the letters A' and 'B'.
72" Wall Plate 72" Wall Plate
X X X A B X X X
X X X A B X X X
23-1/4" 24" 23-1/4" 24"

72" Wall Plate

B
A
Plate
ottom
72" B

2. Install (8) eight 72" wall studs between the top and bottom plates. Nail both wall frames
together. Use 10d sinkers.
3. Square wall frame.
4. Install the first siding panel with the 'LAP' edge flush with the end of the wall and extending
3/4" below the bottom plate.
5. Install (2) two more siding panels.

dge
LAP LAP E

Flush

Siding Extends 3/4" Below Plate

6. Repeat to assemble another sidewall.

Step 3 Assemble Door Wall - Offset Doors
To position the door opening in the center of the wall, go to Step 4. To position
the door opening on the right side of the front wall, flip the walls and apply
siding to the opposite side of the wall frames.
1. Cut (2) two 11" plates from a 34-3/4" long
2x4. Install (2) two 72" wall studs between the
11" long 2x4 wall plates.
2. Position (2) two 58-1/2" long 2x4s together
and indicate with 'X' marks where the wall
studs will be located.
58-1/2" Wall Plate
X
X X X
X X X X
24" 19-3/4"

71-1/2" Header Supports

3. Install (4) four 72" wall studs between (2) two 58-1/2" long 2x4 wall plates
4. Gather (2) two 2x4-72" 2x4s. Cut each board to 71-1/2" and install as a header support on each
wall frame flush with bottom plate. Use 10d sinkers.

LAP Edge Extends 3-1/2"

5. Select a 16" wide siding panel with a
'LAP' edge. Install cut edge flush with
header support. The 'LAP' edge will
extend 3-1/2" beyond the wall frame.
Bottom edge will be 3/4" below the
Cut Edge Flush bottom plate.
71-1/2" Header If installing the optional window you
Support can cut the opening in the siding.
Instructions are packed in window box.

6. Install a 16" siding panel with a

tongue edge. Cut edge will be flush
with the header support.

71-1/2" Header Support

7. Install the last siding panel. The siding will Siding Extends
extend 3-1/2" past the wall frame. 3/4" Below Plate
 Step 4 Assemble Door Wall - Doors Centered
1. Locate (2) two 34-3/4" long 2x4s and position them together.
Indicate with 'X' marks where studs will be located..
34-3/4" Wall Plate
X X X
X X X
19-3/4"

Make (2) Two Frames

2. Install (3) three 72" wall studs between the 34-3/4" wall plates.
3. Locate (1) one 2x4-72" and cut to 71-1/2". Install as a header
support on right side as shown and flush with bottom plate. Use
10d sinkers.
4. Locate (2) two 58-1/2" 2x4s and cut (1) one 34-3/4" plates from
each. Repeat steps 2 and 3 to assemble another wall frame.

71-1/2" Header
Support

5. Select one frame and position so header support is on right.

6. Locate a 16" wide siding panel with a 'LAP' edge. Install this panel with the cut edge flush
with the 2x4 header support. Bottom edge should be 3/4" below bottom plate. Only nail along
cut edge until next panel is installed.
7. Cut a 48-3/4" wide siding panel in half lengthways.
8. Select cut panel with the 'Tongue' edge. Install this panel so cut edge extends 3-1/2" beyond
the end of the frame and tongue edge under the 16" panel. The siding should extend 3/4' below
the bottom plate. Nail both siding panels to frame.
Cut Edge Extends Cut Edge Extends
Beyond Frame Tongue Beyond Frame
Edge

LAP Edge

Cut Edge Flush

71-1/2" Header Support

Left Side Wall Panel Right Side Wall Panel

7. Locate a 16" wide siding panel with a 'Tongue' edge and the remaining 24" wide cut panel.
Install these on remaining frame. Make sure header support is oriented to the left.
Step 5 Assemble Roof Gables
1. Butt (2) two 72" long 2x4s together and secure them with a 3-1/2" x 31-3/4" long OSB
gusset across the top where they butt together. Use (12) twelve 6d common nails. This will
be used as the bottom plate on the roof gables.
2. Repeat to assemble another
12' long bottom plate.
3/4" OSB Gusset

72" long 2x4

3. Place the bottom gable plate on the floor along with (2) two 80-1/2" long 2x4 truss rafters as
shown below. Bottom plate will be on edge. There are short 2x4s, that may have an angle on
one end, supplied in the kit. Use these to hold the truss rafter and bottom gable plate together
by temporarily screwing the blocks to the floor using 2-1/2" screws. This will ensure that the
gable frames and the trusses, assembled next, are identical.
4. Secure the top of the truss rafters together with a 1"x4" barbed metal drive-on plate.
5. Install (2) two 23-1/2" gable studs with angle cut at one end. Nail through the bottom plate
with 10d sinkers and secure the top with barbed metal drive-on plates.

Barbed Metal Plate

80-1/2" long 2x4

Truss Rafter

2x4 Block

Bottom Gable Plate

23-1/2" Gable Stud

2x4 Block

6. Secure the 2x4 bottom plate to the truss rafter with

a 2-1/2" wood screw on both ends. Set gable aside.
7. Repeat steps 3-6 to assemble another gable.
Step 6 Assemble Roof Trusses
1. Place (2) two 80-1/2" long 2x4 truss rafters and a 82" long collar tie together as shown below.
The collar tie has an angle cut on both ends. Reposition the lower 2x4 blocks to hold the truss
rafters in place. See 'Detail B'.
2. Secure the 2x4 truss rafters at the top with a 8" x 16" wood gusset. Nail the gusset to the 2x4s
with (14) fourteen 6d common nails,
3. Secure the 2x4 collar tie with (4) four 2-1/2" long wood screws at each end. Tip: Pre-drill holes
with an 1/8" bit to prevent wood splitting at ends.
4. Turn this truss over and apply a wood gusset to the opposite side at the ridge.
5. Repeat to assemble (4) four more trusses.

Ridge Gusset

80-1/2" Truss Rafter

Collar Tie Flush
with Rafter

2x4-82" Collar Tie

! Install collar tie the same
distance from bottom end of
rafters.
Detail 'B'

ck
80-1/2" Truss Rafter 4 Blo
2x

ck
2x4 Blo
2x4 Block

6. Remove and save the short 2x4 blocks. They

will be used in a later step.
Step 7 Set Walls
67-1/2" Long 2x4
1. Gather (2) two 67-1/2" long 2x4 boards and a
3-1/4" x 67-1/4" OSB filler panel. Nail header
together from both sides with 10d sinkers
staggered 6" apart.
OSB Filler

2. Erect wall panels. IMPORTANT make sure walls are plumb and square. Secure together
at the corners using (4) four 10d sinkers per corner.
3. Nail along siding edge where it overlaps front and back walls at corners.
4. Install the 2x4 door header between the front wall panels. Nail through the wall stud into the
ends of the header. Toenail into the top wall plates.
5. Temporarily install (2) two 2x4-72" boards at both sides of the door opening to hold the wall
straight. These boards will be used later for tie plates.
6. Nail all wall panels to the floor through the bottom plate. Space 10d sinkers 24" apart.

2x4 Door Header

Nail siding

Drawing shows a building

with the doors offset.
7. Install (2) two 4-1/4" siding panels over
the door header. The siding should extend
3/4" below the door header. Cut length to
fit. Wall trim, installed later, will hide
where the siding butts the front wall siding.

Cut 4-1/4" x 48" Siding

Panels to Fit

3/4" Below
Bottom of Header
Step 8 Install Trim
Tip; Paint the siding and trim boards before installing the trim.
1. Install (2) two 75-3/4" long 1x3 corner trim boards to the side wall flush with the top 2x4 wall
plate and flush with siding on the front and back walls. Use 6d galv. nails, spaced 12" apart.
2. Install a 75-3/4" long 1x4 trim board to the front wall flush with wall plate
and with 1x3 trim.
3. Butt a 1x4-6' board against Install All Trim Flush
1x4 corner trim and flush with With Top Plate
top plate. Nail along top with
6d galv. nails.

1x4-
6' T
4. Cut a second 1x4-6' trim board rim
to finish at opposite corner.
5. Install trim on the opposite Front
side wall and corner trim on Wall
Side Wall
front and back walls.

1x3 Trim 1x4 Trim

Step 9 Install Primed Soffit and Filler

1. Locate (1) one 7" wide x 48-3/4" long siding panel and cut in half. Install one half over the
front wall with the primed side facing down. Cut edges should be flush with the inside of
the top 2x4 wall plate and flush with the trim on the side wall. Tack the soffit with a couple
6d common nails. Installing 2x4 tie plates in a later step will provide more nailing.
2. Install (3) three more soffit panels cutting the last panel flush with the side wall trim.
3. Repeat to install 7" soffit
Soffit Flush with
boards on the back wall. Inside of 2x4
4. Install (3) three 4-1/4" wide 7" Soffit
x 48-3/4" filler panels over
the side walls. Install the 4-1/4" Filler
filler flush with the 1x4 trim.
Cut last filler to fit
Soffit and Filler Flush
with Side Wall Trim

Front
5. Repeat to install filler on Wall
the opposite wall. Side Wall
Step 10 Install Siding on Gables
Gable siding is factory cut to be installed either working from left to right or right to left.
Regardless of the direction always begin with the 'LAP' Edge flush with end of the gable.

1. Select one of the gable frames. Turn the gable over so bottom plate is on edge on floor. Support
gable studs and rafters with (2) two 2x4-72" boards stacked. This will give you a solid surface
when nailing siding.
2. Install a gable siding panel with the 'LAP' edge flush with the end of of bottom plate. Use 6d
galv. nails. The siding will extend 3/4" below the bottom 2x4.
3. Install center panel. Cut last panel flush with end of bottom plate.
4. Repeat to install siding on
the other gable frame.

2x4s-72" Stacked to
Level Gable

LAP
Edge
Siding Extends 3/4"
Below Bottom Plate

Step 11 Install Gables

1. Install a gable on the left sidewall. The gable siding will extend over the 1x4 trim on the
lower wall. Secure gable to wall by nailing through the gable plate with 10d sinkers. Nail
siding along the 1x4 trim board with 6d galv. nails.

2. Install gable on the opposite side wall.

Important: Bottom edge of siding extends

over 1x4 trim. Paint this edge.
Step 12 Install 2x4 Tie Plates and Door Trim
1. Cut a 2x4-72" in half and install one 3' piece over the front wall, against the
gable plate and flush with the inside of soffit. Use 10d sinkers.

Install
Flush
Soffit Boards

Front Wall

2. If used for a wall brace, remove a 72" long 2x4

and install this next to the 3' long 2x4. Cut a 3'
piece to fit against opposite gable.
3. Repeat to install tie plates on the back wall.

2x4-72" Tie Plate

1x3-72"
Door Trim

4. Install a 1x3-72" trim board centered across the top door opening and against soffit. The
header siding will extend below this trim board. Use 6d galv. nails spaced 12" apart.
5. Locate (2) two 1x3-72" boards. Tack these, with a couple nails, flush to each side of the door
opening and against bottom of upper trim.
Step 13 Layout Roof Trusses
1. Layout the truss spacing from the left sidewall of the building. Measure from the backside
of the 2x4 gable frame when marking the location of the first truss. Continue 24" spacing
to other gable. Important: When marking the opposite wall, place the 'X' mark on the same
side of the line so your trusses are parallel when they are installed.
2. Install metal hangers to the tie plate with hanger nails . The opening should line up with the
'X' mark, the bottom of the opening, flush with the 2x4 tie plate. Detail 'D'.

Measure From
Backside of 2x4

20-5/8"

24"

Detail 'D'

ate
Tie Pl
2x4

Inside of Building
Step 14 Set Roof Trusses and Soffit Blocks
1. Set roof trusses. Secure trusses to metal hangers with hanger nails.

2. Install short 2x4 blocks in

front of each truss. Secure
2x4 blocks to the soffit
panel using (2) two 1-1/2"
long exterior screws.

3. Install a 2x4 block at each

end of the soffit, flush with
he 2x4 gable frame.

4 Install small primed siding fillers, packed with the

hardware, over the 2x4 soffit blocks. Siding fillers
will be flush with the gable siding. Use 6d galv. nails.

Siding Filler

Step 15 Install Gable Trim

1. Install a 8-1/2" long trim board, called a keystone,
at the top of the gable flush with the top of the
gable frame. Use 6d galv. nails.
2. Install a 81" long 1x4 trim boards at flush
with the top of the gable frame.
Use 6d galv. nails.
3. Repeat on opposite gable.
Step 16 Install 1x4 Fascia and Roof Sheathing
1. Starting at the front left of the building, install 1x4-6' fascia board against the left gable trim.
Install the fascia so the bottom edge of the roof sheathing will rest on the edge of the 1x4. See
Detail 'E'. Use a straight edge to align the 1x4 boards with the top of the trusses. Install fascia
with 6d galv. nails
2. Select a 1x4-7' fascia board next. Cut this
board to fit against right gable trim.
3. Repeat to install fascia on rear of building.
St
Detail 'E' ra
ig
Roof Sheathing ht
Ed
ge
2x4 Soffit Block
s
Trus
2x4
2x4 Tie Plate
1x4 Fascia

Nail Fascia to
1x4 -6' Fascia Board 2x4 Block

2. Make sure the trusses and gables are plumb and the roof sheathing meets at center of 3rd truss.
Starting at the left end of the building, install a 48"x72" OSB roof panel flush with the 1x4
trim on the gable. See detail below. Use 6 common nails spaced 12" apart.
3. Select a 48"x83-1/2" sheet and install next. Cut this panel to be flush with right gable trim.
4. Install the top row of roof sheathing. The roof sheathing will be about 1" below the ridge to
allow for optional ventilation. Cut the 36-1/2"x83-1/2" sheet to fit.
5. Repeat to on opposite side.

Install Roofing — Not Supplied in Kit

Install metal roof edging perimeter of the
roof area. If you are not installing shingles
at this time, you can purchase felt paper to Cut to
36-1/2" x 72" Length
protect the roof sheathing. Install the felt
paper before you install the metal roof edge.
Ridge Cut to
Vent 48" x 72"
Length
Shingles
s
Trus Air
Space
Optional ridge vent provides
ideal ventilation.
Step 17 Install Doors & Hardware
1. Lay the left door with the trim facing up. The
siding on the left door extends past the door trim.
See detail below.
2. Install 5" hinges to the left side of the door frame.
To position the hinge properly, hold the rectangular
plate against the frame. Use 1-1/4" black screws.
3. Install hinges to the right side of the other door.

4. Before fastening the hinges to the side trim,

temporarily prop the doors in the opening. Leave
a space at the top and bottom of the doors and
between the doors and the side trim to allow
room for the doors to expand due to humidity.
If your door opening is out of square, the space
around the doors will not be even. You can
remove and re-position the side trim to make
allowances for this. The side trim does not have
Left Door
to be flush with the frame of the door opening.
You can move the trim in or out to make the
door spacing equal.
5. Determine position of hinges and install to side
trim with 2" screws.
6. Install door hasp on double doors. When properly
installed the hasp will fold in half to receive
locking latch and the screw heads will be
covered.

Siding Extends Past Trim Fold Hasp to Cover

Screws

Barrel Bolt on the

back of left door

7. Install a barrel bolt on the lower back of the door

to secure this door in place when closed. You
will need to drill a hole for the round shaft to
drop into.
8. Install another barrel bolt at the top of the door.
 Material Packaged In Component Kit
5 Collar Ties 2x4 82" 3 1 lb. box 10d Sinkers
14 Truss Rafters 2x4 80-1/2" 5 1 lb. box 6d Galv.
48 Wall Studs 2x4 72" 6 1 lb. box 6d Common
4 Wall Plates 2x4 68-1/2" 2 1 lb. box Hanger Nails
2 Wall Plates 2x4 67-1/2" 50 ea. 1-1/2" Exterior Screws
2 Wall Plates 2x4 58-1/2" 80 ea. 2-1/2" Deck Screws
2 Wall Plates 2x4 34-3/4" 6 ea. 5" Door Hinges
4 Gable Studs 2x4 23-1/2" 1 ea. 4-1/2" Door Latch
10 Truss Gussets 7/16" 8" x 16" 2 ea. 6" Barrel Bolts
7 Soffit Panels 3/8" 7" x 48" 25 ea. 2" Hinge Screws
8 Filler Panels 3/8" 4-1/4" x 48" 25 ea. 1-1/4" Hinge Screws
2 Fascia Boards 1x4 x 84" 6 ea. 1x4 Metal Plates
2 Fascia Boards 1x4 x 72" 10 ea. 2x4 Metal Truss Hangers
10 Siding Panels 48" x 75-3/4" 2 ea. OSB Gussets 3-1/2" x 32"
2 Siding Panels 16" x 75-3/4" 1 ea. OSB Filler 3-1/4" x 67-1/4"
2 Gable Siding Panels 48" x 40" 18 ea. 2x4 Truss Jig Blocks 6" to 8"
4 Gable Siding Panels 48" x 28" 2 ea. 1x6 Keystone 8-1/2"
2 Roof Sheathing 48" x 72" 4 ea. 1x4 Gable Trim 81"
2 Roof Sheathing 48" x 83-1/2" 4 ea. 1x4 Corner Trim 75-3/4"
2 Roof Sheathing 36-1/2" x 72" 4 ea. 1x3 Corner Trim 75-3/4"
2 Roof Sheathing 36-1/2" x 83-1/2" 4 ea. 1x4 Wall Trim 72"
Material not used in this model 3 ea. 1x3 Door Trim 72"
8 Boards 2x3 x 42-3/8" 2 ea. Pre-built Door 32" x 71-1/2"
4 Soffit Boards 3/8" x 7" x 48" 4 ea. Gable Siding Fillers 2"x3"

Roof Shingles by Owner

Qty. Optional Shingles

7 bdl. Roof Shingles

6 pcs. Roof 'drip' Edge 10'