►
From YouTube: 120 Design Lessons - Day 18
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A
Yes,
okay
sounds
good,
okay,
so
take
a
look
at
day.
18
notes
just
paste
it
directly
into
the
zoom.
A
To
the
chat,
okay,
so
that's
the
working
dock
in
the
chat
so
continuing
right
along
here,
so
yesterday,
yeah
we're
it's
any
day
to
install
of
the
walls
where
we're
working
on
the
inside.
Let
me
share
my
screen:
take
a
look
at
share
screen:
okay,
the
18.
good
stuff.
I
mean
the
we
are
learning
to
move
along
in
a
digital
world
and
a
physical
world,
together
with
the
digital
model
pieces
coming
into
it,
remote
collaborators,
putting
things
into
it
too.
I
noticed
the
stairs
were
inserted.
A
A
That's
the
exterior
walls,
the
interior.
You
don't
have
to
worry
about
until
we
put
we
frame
the
house
and
close
it
in.
We
discussed
what
required
what's
required
for
the
house
to
get
closed
in
first
story.
Walls,
second,
story
platform,
second
story,
walls,
roof
structure,
insulation
box
up
to
the
osb
and
then
we're
all
closed
in.
So
we
can
actually
start
working
on
an
interior
details.
We
went
through
one
detail
we
went
through
yesterday.
We
talked
about,
for
example,
and
you
see
here
in
the
cad
we
looked
at.
A
How
do
you
mount
a
little
angle
on
a
roof
where
the
roof
is
sloped,
because
there's
no
such
a
thing
as
a
sloped
roof,
so
it's
actually
1.2
degrees
over
192
inches,
so
there's
a
very
slight
rise
over
the
lens
so
that
water
can
drain
off.
That's
been
put
in
and
matt
brought
up
a
good
question
actually
about
the
structure
there
and-
and
I
actually
do
want
to
revisit
that-
let's
put
a
second
one
on
the
front
of
that
and
turn
it
into
a
little
cavity
where
we
can
put
insulation.
A
So
that's
good
on
two
two
counts,
one.
It's
true
about
load
paths.
If
you
put
the
roof
sitting
on
this
roof
riser
here
just
a
two
by
four,
then
all
the
load
is
on
I'm
gonna
zoom
in
even
further
there
all
the
load
in
this
example.
Here
this
is
the
roof
riser
that
creates
the
four
inches
over
16
feet.
A
A
That's
the
weight
of
the
roof
snow
loads,
everything
else.
It
is
a
good
idea
to
spread
it
over
the
entire
two
by
six
area
of
the
walls.
A
Katrina
pointed
this
out
and
second
issue
here
is:
how
do
you
attach
the
roof
rafters,
which
are
a
box
big
box
so
like
in
this
picture?
What's
the
roof?
Look
like
it
looks
just
like
this
looks
like
just
like
the
floor.
The
second
story
floor
except
the
second
story.
Floor
has
a
cut
out
for
the
for
the
stairs,
but
this
entire
structure
of
the
roof.
Joists,
that's
sitting
on
our
on
this
detail
here
with
the
load
path,
going
down
constantly
fix
it.
A
So
load
path
there,
let's
add
a
second
one
here,
so
that
was
actually
joshua
right.
So
let's
do
that
and
that
way
we
can
have
the
the
riser
module,
be
this
u-shape
with
insulation
in
between,
so
we
can
load
the
insulation
pre-load
the
insulation.
The
second
detail
is:
what
is
that
it's
called
hurricane
ties,
so
both
the
front
of
the
roof
and
the
back
of
it
all
the
joists
just
like
for
the
first
first
story.
A
Second
story:
floor,
you're
using
hurricane
ties
and
that's
manifest
in
in
a
cad
like
some
of
the
cad
detail.
I'll
show
that
detail
just
rerun
that
again
opening
up
freecad
16.,
there's
the
detail
of
what
how
you
connect
these
large
platforms,
the
16
by
32
floor
or
roof
platforms,
which
are
largely
identical.
How
do
you
connect
them
to
the
walls.
A
It's
not
in
the
house
assembly
master.
I
would
go
to
the
cad
files
where
you
find
that
those
details,
we
have
a
number
of
details
under
sh2
cad.
So
in
the
index,
if
you
go
to
the
index,
select
details
2.8,
it's
got
some
of
these
details
like,
for
example,
the
blocking
detail.
How
do
you
attach
the
platform
applies
to
the
roof
and
the
second
story
platform.
A
Blocking
detail:
let's:
let's
look
at
the
hurricane
ties
because
that's
what
has
to
happen.
So
this
is
the
floor.
On
the
first
floor,
there's
the
the
face
blocking
there.
Oh,
where
are
my
ties
here
so
they're,
hidden
hurricane
tie
right
there,
hurricane
thai
one,
those
are
what
we're
talking
about
metal
nailed
in
on
the
joystick.
This
applies
to
the
roof.
This
applies
to
the
the
second
story
platform.
A
Picture
close
this
one
open
this
one.
So
if,
if
we
have
this
detail
here,
if
we
didn't
have
another
block
here
like
this
two
by
four
here,
then
we
wouldn't
have
anywhere
to
attach
the
hurricane
ties
to
they.
They're
short,
their
their
span
is
not
too
long.
It's
only
a
few
inches
couple
inches.
So
if
you
had
that
span
there,
you
wouldn't
be
able
to
attach
to
the
the
second
story,
walls,
so
we're
going
to
need
that
u-shaped
u-shaped
riser
module.
A
Let's
call
it
riser
in
this,
so
in
this
one,
just
reviewing
the
layers:
roof
riser,
it's
that
thing,
but
it's
really
just
that.
I
mean
the
roof
riser
to
make
it
more
accurate.
It's
really
on
the
back
side
there
and
then
everything
above
that
kind
of
tilts.
So
you
can
can
take
all
this
here
and
actually
tilt
it
to
represent,
what's
actually
going
on
in
real
life.
A
So
just
a
little
tilt
of
1.2
degrees-
that's
what's
happening
there
and
a
riser
actually
is
riser
is
straight.
So
everything
up
to
this
point
is
straight,
and
then
we
got
a
slight
slight
incline
on
the
flat
roof.
A
Let's
do
let's
take
a
look
at
the
so
so
that
covers
the
roof.
Riser
detail.
I
think
we're
still
inserting
some
of
the
parts
like
the.
I
noticed
that
the
flooring
like
all
the
plywood
and
the
flooring
has
been
inserted
here
in
the
house
master
file.
So
let's
open
up
the
new
additions
just
to
discuss
what
what
we
got
into
so
for
the
house
assembly
master
plywood
on
the
floor.
I
saw
yeah.
So
let's,
let's
go
through
some
of
these
details.
A
I
notice
the
the
riser
we
already
have.
Let's.
A
A
A
There
are
very
well
defined
heights
for
each
of
the
the
modules
here
that
would
be
an
exam
question:
okay,
what's
the
height
of
each?
But
if
you,
if
you
simply
go
up
with
the
specific
numbers,
let's
actually
add
them
in
for
reference.
So
this
is
our
cheat
sheet
here
for
heights,
but
we've
heard
a
number
like.
A
A
A
A
A
A
A
A
Is
that
there's
3
000
empty
lots
in
kansas
city
that
are
in
the
land
bank?
How
about
we
don't
build
it?
We
have
people
build
it.
We
teach
people
rapidly
and
we
swarm
on
that
and
we
knock
them
out
in
rapid
time
with
large
swarms,
like
think
of
a
thousand
person
swarm,
because
the
designs
are
easy
to
master
with
augmented
reality
or
virtual
reality.
Training
can
train
people
rapidly.
Ideally,
jesse
made
the
example
yesterday
of
took
two
hours
for
some.
This
was
some
medical
procedure,
medical
device
operation.
This
was
actually
military
application.
A
A
Now
the
critical
critique
of
ar
and
vr
for
housing
is
it's
going
to
be
harder
if
you're,
actually
lifting
live
loads,
heavy
things
that
may
be
a
little
challenging,
but
at
least
procedures
when
it
comes
to
detail
like
you
wire
something
up
or
screw
something
together,
that's
probably
doable
well
with
with
arvr,
which
I
mean
the
manhandling
of
things.
That's
just
one
aspect:
that's
that's!
Not
the
greater
part
of
the
build.
The
greater
part
of
the
build
is
by
far
the
small
procedures
that
are
screw.
A
This
thing
in
things
like
that
tie
this
cut
this,
which
are
all
learnable
tasks.
So
imagine
having
large
swarms,
do
this
and
do
this
in
rapid
time.
So
I
think
the
you
know
this
solving
housing
thing
is:
why
are
we
building
have
the
people
that
are
going
to
live
in
a
building's
building?
That's
already
part
of
the
the
model
for
habitat
for
humanity.
A
I
think
we
can
definitely
use
more
of
that,
and
especially
in
like
crisis
zones
or
like
emergency
areas,
where
you
got
to
rebuild
something
from
scratch
really
quickly.
That
could
definitely
lend
itself
to
swarm
builds.
The
digital
model
allows
that
so
so,
just
to
complete
this
here,
how
do
we
calculate
the
osb?
Well,
we
took
that
the
121.125
we
added
95.625,
which
is
almost
eight
feet.
A
That's
the
that's
exactly
what
our
modules
are.
That's
effectively
eight
feet
minus
just
a
little
bit
minus
the
standard,
three-eighths
of
pre-cut
studs,
second
story
top
plate
was
1.25,
keep
going
you
guys
do
it.
What's
the
roof
structure,
insulation
box
osb,
so
we
can
add
up
to
a
magical
number
for
the
height
of
the
osb
at
least
the
one
edge,
because
the
other
one
is
rises,
a
little
bit.
That's
1.5!
A
A
A
This
is
the
zero
z
point.
We
all
started
here
and
then
we
lifted
things
up
into
place
to
to
organize
them.
That
means
the
sill
plate
and
foundation
are
at
negative
z,
values.
So
that's
zero
ground,
zero.
A
Actually,
let's
do
that
actually
later
for
the
afternoon
session.
Can
we
maybe
like
gather
back
here
like
before
we
go
out
into
the
shop
like
12
45
or
so
so
we
can
just
go
over
the
windows,
real,
quick
because
they're
in
the
process.
So
we've
got
a
bunch
of
these
modules
that
are
regular,
regular
modules
that
we've
been
working
on,
we've
been
putting
the
in
the
insulation,
siding
and
still
gasket
and
electrical
building.
All
that
in
there
we're
just
moving
down
the
row
here,
we're
at
at
17..
A
So
we're
now
on
18.,
where
there's
windows,
which
have
actually
an
electrical
outlet,
so
we're
just
moving
down
a
row
and
then
to
24
through
47.,
but
yeah
windows
will
learn
how
to
do
that.
Windows
is
where
you
have
to
pay
a
lot
of
attention,
because
it's
a
hole.
You
gotta
seal
up.
All
the
water
holes
around
the
window,
there's
a
lot
of
potential
for
water
infiltration.
So
what
you
do
is
things
like
z,
flashing,
where
you
go
above
the
window
or
like
it's
called.
You
got
z
flashing
in
between
seams
of
plywood.
A
You've
got
drip
cap
above
the
window
and
just
self-adhering
waterproof
barrier
just
all
around
the
edges
when
you
frame
that,
up
after
you
put
on
the
the
house,
wrap
so
details
like
that,
so
there's
no
water
getting
inside
and
then
trim
around
that.
But
we'll
go
let's
go
through
that
right
after
for
now,
let's
do
an
exercise,
so
we
continue
practicing
just
practical
detail.
A
Let's
take
a
look
at
the
first
floor.
Look
at
the
the
stairs
since
I
saw
them
in
and
and
the
landing
it
looks
like
we've
got
so
this
is
jeff
on
the
call
here.
A
Parts:
okay,
no
headset,
okay,
but
maybe
in
the
chat
box,
I'll
download
the
file
here,
the
master
plot,
but
let's
see
how
accurate
are
the
stairs.
Now
I
know
we've
been
working
on
refining
geometry,
we're
almost
there,
and
that
was
great.
We
basically
said:
okay,
we've
got
so
much
rise
defined
by
the
digital
model.
We've
got
in
fact
exactly
the
1
21.125
as
the
rise
to
the
second
story.
Oh
as
the
first
well,
the
first.
A
What
do
we
call
that
the
floor?
The
subfloor?
That's
actually
the
subfloor
of
the
second
story.
When
we
say
subfloor,
we
mean
the
second
story:
what's
an
easy
name
for
them.
For
that
level.
Second
story:
it's
called
up
to
the
second
story.
The
top
of
the
osb,
which
is
the
does
not
always
be
its
plywood
top
of
the
plywood,
begins
the
second
story.
A
So
we
need
to
get
the
stairs
up
there.
Now
we've
got
a
little
still
a
quarter,
inch
layer
above
that
which
is
actually
the
the
flooring
we're
using
plywood,
that's
stained
and
it's
going
to
be
basically
floor,
planks
quarter
inch.
I
don't
think
I
think
we
can
be
okay
by
like
within
a
quarter
inch.
I
think
quarter
inch
that
final
little
tiny
step.
I
think
I
don't
think
that
matters
I
mean
the
stairs
want
to
be
exact
same
height
for
each
tread.
A
Are
we
okay
on
one
half
a
quarter
inch
off
on
the
last
tread?
Will
that
trip
up
anybody?
I
don't
know,
I
don't
think
you
can
notice
a
quarter
inch.
So
I
think
we'll
be.
A
A
They're
gonna
tell
you
it's
it's
the
same.
It
has
to
be
the
same.
I
wonder
if
the
I
wonder,
if
we
have
to
account
for
that
quarter,
inch
on
the
very
top
where
we
have
the
flooring
so
above
the
osb
is
going
to
be
flooring
which
we
put
on
after
the
walls
are
in.
Actually
because
it's
a
finished
floor,
maybe
we
can
consider
that
if
it's
an
easy
change,
I'm
not
sure
how
critical
that
is.
But
let's
download
the
model
see
where
we
are.
A
And
by
the
way,
look
at
my
luck
here,
just
wanna.
Let
me
share
share
screen
here
again,
but
let's
talk
about
the
the
time
graph.
A
So
obviously
there's
since
there's
a
bunch
of
us
here,
we're
kind
of
exploding,
the
numbers
actually
more
than
at
any
time
in
history.
So
that's
pretty
good,
but
do
keep
your
log
the
idea
there
is
like
if
we're
collaborating
on
a
team
and
especially
if
there's
more
people,
ideally
we
go
to
any
person's
live
which
are
index
actually
right
here.
This
all
this
thing
can
go
to
some
person's
log
and
see
what
they've
been
up
to
you
can
see
their
latest
links
updating
what
people
are
doing.
So
all
of
us
are
here.
A
A
From
the
cad
download
first
floor,
which
I
noticed
visually
quickly
that
oh
yeah
it
has
the
stairs
in
there,
so
we
can
talk
about
what's
under
yeah.
So
then
I
look
just
look
at
the
history
briefly,
we
say
you
know.
What's
the
latest,
is
there
anything
yeah?
It
looks
like
progress.
Sometimes
you
want
to
download
files
that
are
not
the
last
ones,
maybe
but
yeah.
Here
we
want
to
download
the
last
one.
So
let's
look
at
the
stairs
or
the
first
floor.
A
Stairs
again,
stringers
are
the
cut
out
the
stepwise
cutout
cut
out
of
a
long
2
by
12,
which
is
a
lot
of
work,
got
a
cut
out
stringer.
Sorry,
besides,
I
think
we
have
that
in
one
of
these.
A
A
A
A
A
We
are
doing
two
of
these
two
by
twelves
like
this,
and
this
is
cool.
This
is
it's
all
right.
That's
that
works
now.
The
only
thing
on
here
is
these
two
by
fours
are
under
the
stringers
under
the
sorry
under
the
treads.
That's
the
only
difference,
so
I'm
not
sure
what
what
happened
there,
but
the
two
by
fours
are
under
the
treads
and
the
two
and
those.
So
let's
hide
a
few
things
here,
hide
a
few
panels
or
look
at
it
from
the
back.
A
A
The
challenge
about
three
stringer
stairs
is
that
those
three
stringers
have
to
be
very
precise,
otherwise
you're,
squeaky
and
they're
just
a
lot
of
work.
So
here's
a
simple
way
because
we
have
we
have.
We
already
have
walls
around
this.
A
A
So
what
I
would
do
is,
I
would
actually
take
the
stair
let's
see,
and
where
are
we
exactly
in
the
bottom
of
the
stair.
A
Okay,
one
more
detail
here:
there's
a
landing
of
six
inch
height
at
the
bottom,
so
we
can
actually
get
away
with
less.
With
this
tread.
A
A
Let's
just
start
drawing
some
stuff
in
there
for
the
stairs,
so
my
first
question
is:
do
we
have
three
feet
to
the
wall?
A
This
that's
our
rise.
This
vertical
here
is
our
rise.
What
do
we
got
there
7.5?
Well
we're
allowed
7.75.
So
probably
we
could
remove
one
tread,
oh
yeah,
so,
but
that's
already
done
here.
If
we
go,
if
we
remove
this
one
tread
here,
what
do
we
get?
A
A
A
A
A
A
Yeah
yeah,
it's
it's
about
well,
yeah!
In
fact,
it's
exactly
where,
let's
see
what
is
that,
if
we
zoom
in
here
so
this
is
exact.
A
A
A
If
we
get
rid
of
the
first
step-
that's
all
so.
Actually
I
wouldn't
change
anything
on
these
stairs
after
removing
the
first
step
and
therefore
what
happens
on
the
detail
here.
So
if
we
remove
the
first
step,
we
need
the
landing
and
that's
what
we
were
going
to
do,
because
the
landing
it's
also
allows
us
to.
A
That's
the
landing,
so
we
can
start
the
second.
The
yeah
probably
run
the
landing
like
back
to
the
wall
and
therefore
the
first
step
could
be
on
top
of
the
landing
and
then
probably
what
we
do
there.
Just
gotta
trim
it
up
at
the
end.
So
it
looks
neat,
but
probably
I
haven't
thought
about
the
trim
detail
there.
A
But
if
we
have
say
two
by
six
lumber
here,
possibly
like
another
two
by
six
and
another
two
by
six
could
be
the
finished
surface
there
yeah,
but
let's
do
the
the
landing,
then
all
the
way
to
the
wall.
A
So
let's
actually
do
this
who's
gonna
do
this
so
digital
exercise,
so
it
can
get
confusing
within
the
model
that
we're
we're
doing.
Okay.
This
is
like
okay,
we're
in
this
house
big
file.
A
We
know
where
that
corner
is
it's
it's
at
the
far
edge
which
is
16
by
32,
so
we
can
get
the
sketch
of
where,
where
we
are
exactly-
and
we
can
say
how
far
back,
do
we
go?
Who
can
tell
me
how
far
back
we
go
here
to
to
where
this
stair
like
the
stairwell,
starts?
What
defines
the
stair
wall
where
it
starts.
A
A
A
That's
where
the
landing's
gonna
end,
because
the
wall
is
gonna,
start
right
below
we'll
we'll
start
the
wall
like
right.
There.
A
A
So
basically
you
can
look
at
this.
In
fact,
it's
useful
to
take
a
look
at
this
pattern
here,
but
yeah
we,
we
know
what
those
distances
are.
So
what
is
the
distance.
A
A
A
A
A
Oh
well,
there's
there's
the
wall
thickness
there,
which
is
not
drawn
here.
That's
where
the
so,
let's
do
a
sketch.
So
so
remember
this
we're
at
32
by
16
for
this
corner.
We
have
to
go
in
by
the
thickness
of
the
wall
and
we
also
have
to
go
in
by
the
thickness
of
the
interior
plywood,
because
we
put
the
plywood
in
before
and
it's
going
to
stretch
all
the
way
to
the
to
the
beginning,
let's
and
the
most
sensible
way.
Okay.
A
So
if
I'm
looking
right
here,
what's
the
most
sensible
place
to
end
the
bottom,
stairs
bottom
story,
walls
I'll
give
you
two
choices
like
here
or
here
or
even
here,
because
there's
a
on
the
second
floor.
There's
a
wall
here,
a
two
by
four
wall
here,
so
maybe
we
could
even
go
all
the
way
to
like
around
here,
but
where
which
of
those
three
points,
would
we
want
to
end
the
bottom
walls
the
first
floor?
Walls,
like
I
mean
we
can
negotiate
that,
but
what
what
makes
sense
structurally
and
spatially.
A
A
Yeah
second
place
second
or
even
further
yeah.
I
like
that
I'll
I'd
end
it
like
right
there,
because,
if
you're,
just
using
extra
materials
to
support
the
the
second
story,
if
you
have
it
there,
yeah
you'll
support
everything
on
the
second
story
load
path,
because
the
load
path
would
be
what's
on.
The
second
story
is
going
to
be
transferred
through
this,
this
joist,
so
your
wall
wants
to
end
there
to
support
all
the
load.
A
A
So,
underneath
this
corner
is
where
our
wall
is
going
to
end.
Therefore,
that's
where
our
our
landing
will
end.
A
A
How
far
out,
how
far
out
does
the
landing
go
just
to
the
wall?
Yeah?
Okay?
So
now
we
we
have
a
concept
of
what
the
landing
is
defined
by
the
walls
and
defined
by
this.
The
interior
wall
here,
which
is
these
walls
here,
are
the
only
interior
load
bearing
walls.
Everything
else
is
not
load
bearing
and
why
is
it
load
bearing
because
the
cutout
for
the
stair
you've
got
those
joists
hanging
there?
You
got
to
support
them.
A
Okay,
then,
let's
go
to
our
sketch.
So
where
do
we
go
so
we
go
to
let's
go
to
what's
the
best
way
to
start
well,
let's
just
start
from
scratch:
real,
quick
and
quick.
Since
we
are
good
at
this
and
we're
going
to
say,
okay
we're
at
16
32..
A
Let's
start,
let's
do
let's
do
this,
let's
draw
our
16
by
32
or
32
by
16
base,
let's
draw
in
where
the
walls
are
going
to
end
this
whole
step
at
a
time,
so
tag
team
it.
A
Let's
do
so
I'll
start
it.
So
I'm
gonna
go
let's,
let's
do
the
so
this
is
gonna,
be
our
stay,
our
landing,
so
we're
gonna
design
landing.
A
A
A
Let's
look
at
it
from
the
top,
because
we're
gonna
need
to
have
it's
like
a
platform
for
the,
because
it's
a
platform
we
draw
platforms
from
the
top
because
they
have
geometry
going
towards
the
back.
If
you
look
at
it
from
the
front,
you
can't
draw
what's
behind
it,
so
we
got
it
easiest
to
look
at
from
the
top.
A
So
let's
do
the
landing
structure
which
we'll
have
and
on
top
of
the
structure,
what
we've
done
typically
is
use
one
by
four
planks
as
the
actual
walking
surface
like
in
the
cdca
home,
if
you
notice,
there's
a
landing
when
you
go
right
in
a
house
and
also
the
floor
is
also
one
by
fours
one
by
four
planks.