YKK Design Manual - 1477

ThermaShade® Calculation Worksheet for E9-3101
Use the following charts to validate outrigger projection, mullion
spacing, and vertical span. The following worksheet is for one
standard ThermaShade per mullion.
Use the following job requirements as an example:
Combined Load = 40 psf
Mullion Spacing = 5'
Desired Outrigger Projection = 24"
Vertical Span = 11.1'
Wind Load = 60 psf

Chart A

8
7
6
5

24"

4
30"

3

OUTRIGGER
PROJECTION

MULLION SPACING (FT)

ALLOWABLE UNIFORM COMBINED
LOAD FOR THERMASHADE
ATTACHED TO E9-3101 MULLION

STEP 1

OBTAIN COMBINED LOAD

		*COMBINED LOAD: __________(example: 40 psf)

36"

2
20

40

60

80

*Allowable combined load (in PSF) as required by the code of jurisdiction
and/or code referenced ASCE standard (Minimum Design Loads for
Buildings and Other Structures) and determined by the building engineer
of record (reference signed document) consisting of dead load plus other
load effects such as snow, snow surcharges and drifts, ice, wind, live load
roof, or others.

100

ALLOWABLE COMBINED LOAD (PSF)

Chart B
ThermaShade
Length

24
24
24
24
30
30
30
30
36
36
36
36

Combined
Load

Inch
Inch
Inch
Inch
Inch
Inch
Inch
Inch
Inch
Inch
Inch
Inch

80
60
40
20
80
60
40
20
80
60
40
20

PSF
PSF
PSF
PSF
PSF
PSF
PSF
PSF
PSF
PSF
PSF
PSF

STEP 2

Reduction
Factor

VALIDATE OUTRIGGER PROJECTION

0.82
0.86
0.91
0.95
0.73
0.79
0.86
0.93
0.63
0.71
0.80
0.90

Using Chart A, validate the desired sunshade depth (outrigger projection).
		 *COMBINED LOAD: __________
		 (Draw a vertical line at the Combined Load. Example: 40 psf)
		 VERTICAL MULLION SPACING: __________
		 (Draw horizontal line at Mullion Spacing. Example: 5')
		DESIRED OUTRIGGER PROJECTION: __________
(Example: 24")
Intersecting point must be below the curve of the Outrigger Projection.
In the example shown, the intersecting point is below the 24" Outrigger
Projection curve, therefore it is validated.

STEP 3

DETERMINE REDUCTION FACTOR

E9-3101
WITH HORIZONTALS
WITHOUT THERMASHADES

Determine Wind Load reduction factor from Chart B.
		 REDUCTION FACTOR: __________(example: 0.91)
		 Note: Interpolate the reduction factor for combined loads not shown.

15

V
E
R
T
I
C
A
L

14

S
P
A
N

9

(FT)

STEP 4

APPLY REDUCTION FACTOR AND VALIDATE THE DESIRED
VERTICAL SPAN

13
12
11
10

60
70
80
90
100
110
120

8
7
6

2

3

4

5

6

7

MULLION SPACING (FT)

Page-56

PSF
PSF
PSF
PSF
PSF
PSF
PSF

Using the standard Wind Load Chart to the left, apply the Reduction
Factor to the Vertical Span.
-Draw a vertical line at the Mullion Spacing until it intersects the desired
Wind Load curve. (Example: 5'/60psf)
-Draw a horizontal line at the intersecting point and determine the Vertical
Span (before applying the Reduction Factor). (Example: 11.1')
-Multiply the Vertical Span by the Reduction Factor to determine if the
reduced span is acceptable. For example:
11.1' (Vertical Span) X 0.91 (Reduction Factor) = 10.10'. Since 11.1' is
greater than 10.10', the desired Vertical Span has been validated.
If any of the data calculated above does not validate the desired job
requirements, consider reducing the outrigger projection, mullion spacing
or vertical span. Solutions may also be available to meet your specific
needs by contacting our engineering group at 1-866-955-2732.
Effective Date: January 18, 2019 | 09-1000-07
YKK Design Manual

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