Miscellaneous - Arbuckle - Laserfiche WebLink

Home Browse Search

VENTILATED THIMBLE ASSEMBLY (IPICVTA) AND ROOF SUPPORT ASSEMBLY (IPICRSA) The ventilated thimble assembly is designed to allow Model IP~C Grease Duct Series 4G to penetrate a combustible roof at a nominai 3" clearance to combustibles. Figure 36 ilfustrates the required minimum framing dimensions. The ventilated thimble is intended for installa6on on a flat roof. It may be used on a pitched roof if a curb is installed at the penetration to provide a level surtace for mounting the thimble. 3. Install the Grease Duct passing through the thimble and extending above the roof. 4. Instail the 2 split lateral support rings on the Grease Duct casing, one above the thimble and one below the thimble. Leave the bolts loose enough to allow the ring to slide along the casing. The spacer tabs are to be toward the thimble. 5. Push the lateral rings along the Grease Duct casing untii they are completely enclosed in the thimble. 6. Install the flashing centered on the thimble. Secure it to the roof and seal it to the roof inembrane as appropriate. 7. install the storm collar around the Grease Duct casing allowing the ventilation spacers on the underside of the collar to rest on the upper edge of the 8ashing. Tighten the draw screw and seal between the coilar and the Grease Duct casing with P077 Grease Duct sealant. The roof support assembly consists of the same parts as the ventilated 3ssi thimble except that one of the lateral rings is replaced with a vertical support ring. Installation is iden6cal to the ventilated thimble except step 4 (see Fig. 38). FIG. 38 - ROOF SUPPORT ASSY. INSTALLATION The ventilated thimble consists of the thimble with 4 support brackets; 2 lateral support rings, split for ease of installation; a flashing; a storm collar. FIG. 37 - VENTILATED THIMBLE ASSY. INSTALLATION PIPE O.D. STORM COLLAR PIPE O.D. sroann couar~ FLASHING VERTICAL SUPPORT RING BRACKEf lAG SCREW OR 80LT THIMBLE LATERAL SUPPORT RING FLASHING LATERA~ SUPPORT RWG BRACKEf LAG SCREW OR BOLT THIMBLE ATERAL SUPPORT RING Installa6on of the ventilated thimble is as follows (see Fig. 37): 1. Cut the roof opening and reinforce the edges of the hole as appro- priate for the expected load bearing requirements. Attach the thim- ble brackets to the thimble using the hardware provided. 2. Set the thimble through the roof, making sure it is centered in the roof penetration hole, and secure it to the roof deck with bolts or lag screws supplied. The brackets may be welded to a metal roof, if desired. The roof support assembly is a special varia6on of the ventilated thimble which also provides vertical support to the Grease Duct. It is especially useful when the Grease Duct rise below the roof is long enough to cause movement from thermal expansion to exceed approximately 2" (51). Install lateral support ring below thimble as per step 4 above. Then install the verfical support ring. Vertical ring consists of 4 half-clamp rings designed to lock together when assembled. Splits of rings should be 90° apart and notches on inside of ring should align. Rings are assembled with one on top of flange band and one below flange band. When top and bottom halves are bolted together, they form a rigid circular plate around the inner wall of the pipe. This plate rests on the top flange of the thimble and carries the weight of the Grease Duct. Because it is not fastened to the thimble, the Grease Duct can expand upward in the thimble if needed. VARIABLE PITCH VENTILATED THIMBLE ASSEMBLY (IPICVPVTA) AND VARIABLE PITCH ROOF SUPPORT ASSEMBLY (IPICVPRSA) These components are special variations of the ven6lated thimble assembly. They provide the same clearance to combus6bles and types of suppo~t, but are designed to be installed in pitched roofs. Installation is similar to the flat roof versions except for the following. 14 FIG. 36 - ROOF FRAMING FOR VENTILATED THIMBLE