Spark
Arrester Requirements
The
City of Daly City Municipal Ordinance 15.08.200 requires
that at the time of re-roofing, all existing operational
chimneys shall terminate in a substantially constructed
spark arrester.
The spark arrester must be installed at the start of the
project. The Building Inspector will need to see such spark
arrester in place at the time of inspection.
Spark arresters must comply with the California
Building Code as adopted by the City, specifically section
3102.3.8, the total area of the arrester shall be at
least four (4) times the total area of the chimney area.
The chart below indicates minimum arrester screen dimensions,
which will comply with the code.
The
spark arrester shall be tight fitting to the chimney to
prevent sparks or embers from reentering the building.
2001
California Building Code-Section 3102.3.8: Where determined
necessary by the building official due to local climatic
conditions or where sparks escaping from the chimney would
create a hazard, chimneys attached to any appliance or fireplace
that burns solid fuel shall be equipped with an approved
spark arrester.
The
net free area of the spark arrester shall not be less than
four (4) times the net free area of the outlet of the chimney.
The spark arrester screen shall have heat and corrosion
resistance equivalent to 12-gauge wire, 19-gauge galvanized
wire or 24-gauge stainless steel wire.
Openings
shall not permit passage of spheres having a diameter larger
than 1/2" and shall not block the passage of spheres
having a diameter of less than 3/8".
Chimneys
used with fireplaces or heating appliances in which solid
or liquid fuel is used shall be provided with a spark arrester
as required in the fire code.
Minimum
Spark Arrester Construction
| Minimum
Spark Arrester Requirements |
|
Chimney
Dimension |
Chimney
Area |
Minimum
Screen
Area |
Screen
Height |
Minimum
Arrester
Diameter |
| Circular
Chimneys
(Inches)
|
8
|
50.24
|
200.96
|
4.00 |
16.00 |
| 8 |
50.24
|
200.96 |
6.00
|
10.67 |
|
10 |
78.50
|
314.00 |
6.00
|
16.67 |
| 10 |
78.50 |
314.00
|
8.00
|
12.50 |
|
12 |
113.04
|
452.16 |
8.00
|
18.00 |
| 12 |
113.04 |
452.16 |
10.00 |
14.40 |
| 14 |
153.86
|
615.44
|
10.00
|
19.60 |
| 14
|
153.86
|
615.44 |
12.00
|
16.33 |
|
Square
Chimneys
(Inches)
|
|
| 8 |
64
|
256.00 |
6.00 |
13.59 |
| 8 |
64 |
256.00
|
8.00 |
10.19 |
| 10 |
100
|
400.00 |
8.00
|
15.92 |
| 10 |
100 |
400.00
|
10.00 |
12.74 |
|
12 |
144 |
576.00
|
10.00
|
18.34 |
| 12 |
144
|
576.00 |
12.00
|
15.29 |
| 14 |
196 |
784.00 |
12.00
|
20.81 |
| 14 |
196 |
784.00
|
14.00 |
17.83 |
Please
call the Building Division at (650) 991-8061 if you need
additional information.
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