Desa 36WL, 36WIS, 36WIL, 36WS Firestop Spacers V3600FS-8DM, Penetrating the Roof

2.Chimney weight above offset rests on return elbow. Straps must be securely nailed to rafters or joists (see figure 9, details a & b).

3.Maximum length of pipe between supports (return elbow or 12S-8DM) is 6’ of angled run. Maximum of two (2) 6’ angled run sections per chimney system (see figure 11).

Figure 9

All joints between offset should be secured with two screws, only on the outer pipe, and shall not penetrate the inner stainless.

Figure 10

Figure 11 *TYPICAL OFFSET INSTALLATIONS

*For systems with 2 elbow sets, the minimum height is 22 ft. The maximum height for any system is 50 ft.

FIRESTOP SPACERS: (V3600FS-8DM)

Firestop spacers are required at each point where the chimney penetrates a floor space. Their purpose is to establish and maintain the required clearance between the chimney and the combustible materials. When the pipe passes through a framed opening into a living space above, the firestop must be placed onto the ceiling from below as shown in figure 12.

Figure 12

PENETRATING THE ROOF:

To maintain a 1-inch clearance to the pipe on a roof with a pitch, a rectangular opening must be cut.

STEP 1: Determine the center point through which the pipe will penetrate the roof.

STEP 2: Determine the center point of the roof. Pitch is the distance the floor drops over a given span, usually 12 inches. A 6/12 pitch means that the roof drops 6 inches for each 12 inches one measure horizontally down the roof.

STEP 3: Use the roof-opening chart (figure 13) below to determine the correct opening length and flashing required. STEP 4: Remove the shingles around the opening measured and cut out this section.

STEP 5: Add the next sections of the pipe until the end penetrates the roofline. Check to see that the proper clearances are maintained. Extend chimney by adding sections of double wall pipe until pipe is a minimum of 30 inches above the highest point of the roof cutout. Termination and chimney must extend a minimum of 36 inches above the highest point where it passes through roof.

PITCH			SLOPE		OPENING "A" MAX		USE FLASHING
		(degrees)				(inches)	MODEL NO.
	FLAT	0		15			V6F-8DM
0 - 6/12		26.6		16 - 1/8			V6F-8DM
6/12 - 12/12		45.0		20 - 3/8			V12F-8DM

Figure 13

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