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Heat shield to protect wooden fence?

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  • Attjack
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    • Aug 2017
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    Heat shield to protect wooden fence?

    I'm going to install a 4 X 6' sheet of stainless steel behind this grill to stop the heat from reaching the fence. I'm thinking of a 4" standoff to create an airspace between the steel and the fence but I'm not sure if I should also back the SS with cement board. What do you think?

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  • Dan Deter
    Club Member
    • Jun 2018
    • 525
    • Raleigh, NC
    • Weber Summit S-670
      Thermapen Mk 4

    #2
    I've got maybe 3" between the back of my Weber S670 and the deck railing and it seems to be fine. However, it does not extend above the grill, top rail is 4-5 inches above the grate level.

    Comment


    • Attjack
      Attjack commented
      Editing a comment
      If I'm cooking something fatty like pork chops or flanken cut beef short ribs I get flames shooting out the back of the grill. As you can see the wood starts below the grill and extends way up unlike your top rail situation. I think the fence will continue to dry out as time goes on so I don't think not installing a heat shield is an option for me. Plus, the stainless steel was delivered yesterday.

    • Dan Deter
      Dan Deter commented
      Editing a comment
      Definitely go with the cement board, then.
  • MBMorgan
    Club Member
    • Sep 2015
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    #3
    CaptainMike ?

    Comment

    • GolfGeezer
      Club Member
      • May 2019
      • 289
      • San Clemente, CA
      • Sam

        MAK 2 Star
        Hestan Aspire 36" Grill
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      #4
      Well, based on install instructions and warranty which calls for 16" of clearance from combustibles, I would go with the cement backing to maximize the protection of your wood.

      Comment

      • klflowers
        Club Member
        • Sep 2015
        • 3657
        • Tennessee

        #5
        While waiting on the Cap to chime in, my $.02 is to use the cement board. SS is a pretty good heat conductor, so I would be overkill safe.

        Comment

        • Attjack
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          #6
          Sounds like you guys are telling me what I already know (I'm also wondering if I already asked this question). In fact, maybe I'll mount cement board to the fence with a 3/4 standoff, do a 4" standoff, and then the cement board and steel.

          Comment

          • CaptainMike
            Club Member
            • Nov 2015
            • 2672
            • The Great State of Jefferson
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            #7
            If I'm reading this correctly, occasional direct flame impingement and conducted heat are your primary concerns. The cement board/SS solution should be fine. Providing 1" airspace between sheets is usually adequate and is the common way to build noncombustible walls around wood stoves. My question concerns radiant heat. Does that back wall get very hot to the touch while you're grilling? The shielding you're proposing should eliminate that, but be sure it does. Also, be very aware of fasteners and penetrations and seal them appropriately.

            Comment

            • Attjack
              Club Member
              • Aug 2017
              • 4548
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                DigiQ DX2
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                Arteflame 26.75" Insert

                Blaze BLZ-4-NG 32-Inch 4-Burner Built-In
                - With Rear Infrared Burner
                - With Infrared Sear Burner
                - With Rotisserie
                Empava 2 Burner Gas Cooktop
                Weber Spirit 210
                - With Grillgrates
                ​​​​​​​ - With Rotisserie
                Weber Q2200

                Blackstone Pizza Oven

                Portable propane burners (3)
                Propane turkey Fryer

                Fire pit grill

              #8
              Thanks for the advice, @CaptainMike I'm going to follow it. The fence gets warm but not so hot that I can't leave my hand on it unless the scenario I described above is occurring and flames are almost licking the fence.

              I think I may install another horizontal board above the existing one and attach one sheet of cement board to that. That would create 3/4" of airspace although there would be those 2 wooden horizontals in contact with that cement board. Then perhaps some sort of metal brackets and another layer of cement board. I was thinking of just sandwiching that second sheet of cement board with the steel unless you think having another inch of air between the second sheet of cement board and metal is needed.

              How would you recommend sealing the fasteners?

              Comment


              • CaptainMike
                CaptainMike commented
                Editing a comment
                Sandwiching your second layer should be fine. Try to avoid putting your spacers and fasteners in proximity of your problem area and get some fire-rated caulk from a place like Home Depot. It is a common product that is used for penetrations like plumbing and electrical through fire rated walls.

              • Attjack
                Attjack commented
                Editing a comment
                Thanks, Mike!

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