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Design Guidelines

To design a project with attic sprinklers use these steps as a
guideline:

• Determine if single, dual directional or hip sprinkler is needed.
• Determine the roof slope is between 4:12 to 12:12. If more than

one slope is being used on a project, select the correct sprinkler
for each area.

• Follow the guidelines for each type of sprinkler as follows:

For Back to Back

(dual directional)

• Determine the throw needed

(see spacing requirements on

page 5). If over 20'-0"

(6,1 m)

up to 60'-0"

(18,3 m)

is required,

use the 8.0 K-factor back to back dual directional to reduce the
pressure required, or if pressure is not a concern, use the 5.6 K-
factor Sprinklers to minimize over discharge.

• If less than 20'-0"

(6,1 m)

is required, use the 5.6 K-factor back to

back dual directional to minimize pressure and flow require-
ments.

• Determine the distance along the slope. If the distance is not

equal, use the longer side. Multiply the longer side by two to
determine the spacing down the slope. Four hundred divided
by this value will determine the maximum spacing along the
ridge. The maximum is distance is 6'-0"

(1,8 m)

. For example,

a 12:12 slope at the maximum span of 60 feet

(18,3 m)

will

produce a slope length of approximately 42.5 feet

(13,0 m)

That number multiplied by two produces a 85'

(25,9 m)

throw.

Four hundred square feet maximum divided by an 85'

(25,9 m)

throw only allows a 4'-8"

(1,4 m)

spacing along the ridge. Using

the maximum spacing, space the sprinklers along the ridge.

• Avoid obstructions as shown on page 9. If necessary, add

standard sprinklers to maintain coverage around obstructions.

• Calculate the sprinkler system in accordance with the

appropriate flow and pressure information on page 5. There is
no interpolation of the flows and pressures shown on the chart.

For Single Directional
• Determine the throw needed.
• As the 400 square feet

(37,2 m

)

is not a factor with the Single

Directional, the maximum spacing is 6'-0"

(1,8 m)

and the

minimum is 4'-0"

(1,2 m)

(see figures 2 &11). (The reason 400

square feet is not an issue with the single directional is because
at its maximum spacing, 6'-0"

(1,8 m)

on center/covering 40'-0"

(12,2 m)

flat / a 12:12 slope / and the throw being 56.5 feet

(17,2

, the 400 square foot

(37,2 m

)

maximum would not be

exceeded.)

• Avoid obstructions as shown on page 9. If necessary, add

standard sprinklers to maintain coverage around obstructions.

• Calculate the sprinkler system in accordance with the

appropriate flow and pressure information on page 5. There is
no interpolation of the flows and pressures shown on the chart.

For HIP Sprinkler

(see figure 11)

• Verify framing direction is perpendicular to outside wall

(see

figures 11 & 12). If not, cover that area with standard sprinklers.

• From the intersection of the top of the hip and the ridge the

maximum distance down the slope of the hip is 3'-0"

(0,9 m)

Start the layout with the first sprinkler as close to that point as
possible, but no further, while staying 6"

(152,4 mm)

away from

the face of the trusses. Remember the slope of the hip is not
equal to the slope of the roof from the ridge to the outside wall.
Continue to space sprinklers down the hip at a maximum of
6'-0"

(1,8 m)

on center as measured along the slope of the hip.

When the bottom of the hip is encountered, the last sprinkler
must be within 7'-6"

(2,3 m)

of the outside wall as measured flat

(plan view). If this pipe is “cut to fit” remember to take into
account the different slopes the hip and the roof as well as
distances measured along the slope verses horizontal in plan
view.

• Avoid obstructions as shown on page 9. If necessary, add

standard sprinklers to maintain coverage around obstructions.

Figure 7

Figure 8

Figure 9

Branch Line

Ceiling

Truss

Ridge

6" (152,4 mm)

minimum

(152,4 mm)