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.

ECDmc011205