Fill area around shield with insulation (Courtesy of BSC). This is a situation you want to avoid as such condensation forms creosote and soot. You should never have insulation in contact with a wood stove flue pipe. Add to cart. If you are venting the fireplace from the top, you need to cut out a hole for the vent from the insulation and leave it in place, but remove the entire piece for side venting. There are two types of Class A chimney pipe: Solid-packed chimney — These pipes have smaller inner diameters (usually ranging from 5 inches to 8 inches) that have some insulation, either double-wall (like Simpson DuraVent DuraTech pipe) or triple wall (like Simpson DuraVent DuraPlus pipe). Seal the gap between the flue and metal flashing with special high-temperature caulk. The installer said I could stuff some fiberglass insulation down inside the insulation guard, as you can see in the picture. hvac5646. GREAT STUFF™ Fireblock Insulating Foam Sealant is a ready-to-use, minimal-expansion insulating foam sealant that fills and insulates gaps up to 3/4 inch to restrict airflow. Fix a tub floor that gives underfoot by filling the . It dries in 15 minutes; when it fully cures in 24 hours, it can be sanded . To do that, you have to take a continuous piece of house wrap and wrap it (duh) outside of the fire chase. He reasoned that the insulated chimney pipe itself was insulated with fiberglass, so this was no different. I am reinsulating this wall and I need some advise on how to insulate this. After making the dam, I did scoop the insulation that had fallen against the insulated pipe. The longer it takes combustion gas to exit the flue liner column, the more likely it is to lose its heat and condense on the liner. Mist the drafty area with water before and after foaming to speed up curing. Get it Thu, Mar 3 - Fri, Mar 4. . The metal-and-caulk method you describe is one that I typically use in attics, but an alternative approach is to frame tightly around the chimney with steel studs, then use solid steel channel at the top as a fire block. Finally, prepare for adding insulation (foam or. The flue is the duct or opening in the chimney that expels the exhaust from the fireplace outside. Expect one-time use. Warning: Do not use spray foam for any of the joints near a vent pipe. Several cans of expanding spray foam insulation for illing larger gaps (1/4 inch to 3 inches) • Special high-temperature (heat-resistant) caulk to seal around lues and chimneys • Roll of 14-inch wide aluminum lashing to keep insulation away from the lue pipe • Retractable utility knife and sheet metal scissors • To do this: Cut enough aluminum flashing from the roll to wrap around the vent pipe, with an extra 6 inches to spare. The pipe comes out of the wall, into the garage, and up to the roof. 10. After wrapping, make sure to secure it with some construction level staples. This attempt at a solution was really unsafe. Cut slots 1 in. 9. Where a metal chimney passes through building walls or floors fire blocking or use of a fire-blocking foam insulation may be required by local building codes. Sheep's Wool: $2.40 per s.f. . I do not remember if I used sheet metal or sheet rock or plywood. Do this from the top and then cover the opening with galvanized sheet metal to prevent water from infiltrating. 99. In fact, the technical bulletin of that product says, "Not a . Apply foam sealant to the gap around the pipe's perimeter, advises Family Handyman. (R-19) Spray Foam …. There's a small gap of about 1/8" around each pipe. midwestcoast. om the chimney, allowing for rapid heat-up and draft. Form an insulation dam to prevent insulation from contacting the flue pipe. However, spray foam is not designed for direct contact with open flame. deep along the bottom and bend out the tabs. Alternative Insulation Materials. It's a 2 stage furnace and the installers put in 2 pvc pipes that go directly outdoors. $8.99 $ 8. Of course, you'll still need to seal gaps with fireproof caulk. To keep a fireplace working properly, never use spray foam on the inside of the fireplace or the chimney, or on the damper. $8.99 $ 8. Training; usually performed by specialized trade contractor - ADAPTABILITY: Insulation that entirely fills wall cavity makes snaking wires or pipes 19) Cotton Batt Insulation: $1.20 per s.f. You may have to cut through drywall to fully expose the pipe and be able to apply insulation. 4.4 out of 5 stars 13. I was thinking of doing some better framing around it and maybe use rigid foam insulation, but I read that building code requires a 2" gap around. $7.18. Sealants are a type of substance used to block fluids from penetrating the material it is on. Step 1 - Wrap Pipe in Insulation. Inject foam between the back side of the garage door jamb and the stem wall to prevent pests from infiltrating this common entry point. When expanding foam is cured, it's considered nontoxic, but isocyanates—the gases released during the application process—can irritate nasal . Due to pressure differences caused by stack . Where a metal chimney passes through building walls or floors fire blocking or use of a fire-blocking foam insulation may be required by local building codes. Form an insulation dam to prevent insulation from contacting the flue pipe. Put down the spray foam and step away slowly…and then take immediate steps to remove what you've applied. The same rules apply to prefabricated metal chimneys. Posted on 26/07/2004 by Jeff. Insulation Around Flue Pipes. Price: $ 7 18. Photo 7: Separate insulation from the pipe. "The Wall Sleeve is used to protect the chimney in the wall passage when a 90deg flue system passes to the outside wall. I am worry about using regular attic insulating products. A single wall stovepipe must have a clearance to combustible walls and ceilings, measured at right angles to the pipe of at least 18 inches. Get it Thu, Mar 3 - Fri, Mar 4. . Pull the trigger and allow the sealant to completely fill the gap as you move along the sides of the vent. I have recently had close cell insulation sprayed in a metal building The contractor was suppose to install 2" of foam and states they sprayed 5 coats of insulation However the actual thickness is 1"-1-1/8" He is claiming the foam did not expand as it should have but that the material for a 2" of foam has been sprayed. . Cured foam can be trimmed, shaped, sanded, painted or stained. The first step to waterproofing your chimney is to determine how much material is needed. Answer this question. Sealants are a type of substance used to block fluids from penetrating the material it is on. Cut enough aluminum from the coil to wrap around the flue plus 6 inches. Apply foam sealant to the gap around the pipe's perimeter, advises Family Handyman. #3. The building inspector also required us to trim . You can certainly use expanding foam around a gas pipe as it is conveniently packaged and thus also simple to use. At left you can see the orange fire-block foam spray insulation that oozed out from the partition wall that was sealed with this material. 2) Have an insulating air gap, isolating the liner fr. If you overfill an area, trim off the excess foam with a serrated utility knife once it's cured. 3. These pipes contain fiberglass or ceramic insulation . Get it as soon as Tomorrow . Gray Fire Block Specialty Sealant. Track the exhaust pipe from your dryer until it leaves the house. Bed a bath. Historically, people have used the term "flue" and meant the chimney itself. I am worry about using regular attic insulating products. Now, you must form an insulation dam to prevent insulation from contacting the flue pipe. If the gaps are large, you can use a non-expanding 1:1 spray foam to fill in the gaps. Holes hidden in attics, basements, and crawlspaces are much harder to locate and usually cause bigger problems. Nix knocks. Spray foams that expand at a 3:1 rate add pressure to the surrounding areas, which could cause damage or even crush some vent pipes. 3M 10.1 fl. On the exterior surfaces of the fireplace and chimney, spray foam is fine because these surfaces won't get hot enough to melt it or to cause any damage. How to install a chimney through a metal roof. establishment. Put petroleum jelly around the vent pipes before you spray the foam into the gaps. Figure 10. deep and a few inches apart along the top and bend the tabs in. If the foam in the straw applicator hardens, trim the straw down until you can spray foam again. The only insulation that should be touching that flue pipe is something that's rated for high temperatures, like mineral wool, and even then only in accordance to the manufacturer's instructions. I need to know what insulation to use around the stovepipe from my wood burning stove. My stove was just installed and I had them run a new chimney pipe for it. Because the pipe gets hot, building codes usually require 1 inch of clearance from metal flues (2 inches from masonry chimneys) to any combustible material, including insulation. This item: 16 oz. GE Advanced Silicone 2 10.1 oz. Step 4 - Minor Chimney Repairs. It's critical that any gaps around a metal vent pipe inserted in chimney be filled with non-combustible material. It exits through the ceiling. . on Mon, 05/07/2012 - 05:22. The grease will keep the foam in place when . Reflective White Foam Insulation Heat Shield Thermal Insulation Shield 48"x50ft. Nov 16, 2011. If playback doesn't begin shortly, try restarting your device. Sealing the drafts will cut the utility bill. 3. With a drop in temperature comes condensation. There are better ways to keep cold air out and losing the air you pay to condition. 1. Wall Support Kit Decorator Ceiling Support Kit Kit Includes: + Deluxe Raincap + Roof Flashing (0/12 - 6/12 pitch Allow the foam sealant to thoroughly dry before removing excess sealant. To trim, use a sharp knife or serrated blade. Foam sealant is good for sealing gaps around pipes greater than 1/2 inch. Spray foam is great for sealing drafts, but that doesn't mean it's also suitable for sealing against the chimneyA little sheet-metal work accompanied by some heat-resistant caulk will make the house more fire-resistant.But is the question how to do that? Spray foam along washing-machine water-supply pipes where they meet walls to quiet spin-cycle vibrations. Cut slots about 2 in. How to Waterproof Your Chimney and Prevent Chimney Leaks Step 1 - Measure the Surface Area of Your Chimney. Pros: Foam is tack-free in about 5-10 minutes and cures in eight hours. Magnetic Stove Thermometer Fire Stove Pipe Thermometer Gauge for Wood Log Chimney Pipe Oven Temperature Meter(1 Piece) 4.4 out of 5 stars 122. They sealed around the pvc pipes outside with silicone. Cons: Can will seal itself shut if allowed to sit unused for over two hours and may not be restarted. I need to know what insulation to use around the stovepipe from my wood burning stove. You should never have insulation in contact with a wood stove flue pipe. All stoves require a minimum 36-inch clearance to unprotected combustibles above and on all sides of the stove. If they're right, it indicates that it's OK for fire rated foam to be in contact with a (twin wall) flue. I have a fireplace insert in my basement. My IR temp measurements for exterior flue-pipe temperatures at the exhaust flange doesn't exceed 127˚F and 106˚F at the thimble. Either expanding or non-expanding foam sealant is sufficient for filling the gap. 88.