YKK Design Manual - 1486

ThermaShade® Calculation Worksheet for BE9-2553/BE9-2552

MULLION SPACING (FT)

Chart A
ALLOWABLE UNIFORM COMBINED
LOAD FOR THERMASHADE
ATTACHED TO BE9-2553/BE9-2552

6
5

24"

4
3

30"

2

36"

20

40

60

OUTRIGGER
PROJECTION

8
7

80

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
30
80
60
40
30
80
60
40
30

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

S
P
A
N
(FT)

STEP 1

OBTAIN COMBINED LOAD

		*COMBINED LOAD: __________(example: 40 psf)
*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.

STEP 2

Reduction
Factor

VALIDATE OUTRIGGER PROJECTION

0.60
0.66
0.75
0.80
0.49
0.56
0.66
0.72
0.40
0.47
0.57
0.64

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: 3')
		DESIRED OUTRIGGER PROJECTION: __________
(Example: 30")
Intersecting point must be below the curve of the Outrigger Projection.
In the example shown, the intersecting point is below the 30" Outrigger
Projection curve, therefore it is validated.

BE9-2553 / BE9-2552
WITH HORIZONTALS
WITHOUT THERMASHADES
V
E
R
T
I
C
A
L

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 = 3'
Desired Outrigger Projection = 30"
Vertical Span = 11.3'
Wind Load = 15 psf

STEP 3

DETERMINE REDUCTION FACTOR

Determine Wind Load reduction factor from Chart B.

14

		 REDUCTION FACTOR: __________(example: 0.66)
		 Note: Interpolate the reduction factor for combined loads not shown.

13

STEP 4

APPLY REDUCTION FACTOR AND VALIDATE THE DESIRED
VERTICAL SPAN

12
11
10

15 PSF

9

20 PSF
8

30 PSF
40 PSF

7

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: 3'/15psf)
-Draw a horizontal line at the intersecting point and determine the Vertical
Span (before applying the Reduction Factor). (Example: 11.3')
-Multiply the Vertical Span by the Reduction Factor to determine if the
reduced span is acceptable. For example:
11.3' (Vertical Span) X 0.66 (Reduction Factor) = 7.46'. Since 11.3' is
greater than 7.46', the desired Vertical Span has been validated.

6

2

3

4

5

6

7

MULLION SPACING (FT)
09-1000-07 | Effective Date: January 18, 2019

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.

Page-65
YKK Design Manual

Table of Contents for the Digital Edition of YKK Design Manual
