outlet on chimney cinderblock
#1
08-09-14, 06:39 AM
outlet on chimney cinderblock
Is it acceptable to mount a junction box/outlet on the exterior of a chimney on cinderblock with tapcons or cement anchors?
(indoors, in my basement)
(indoors, in my basement)
#3
08-09-14, 12:28 PM
Need to find plan B.
Drilled into the block to attach an anchor to it and the "cinderblock" (not sure what the material is now). Is only like a 1" at best. My masonary bit went right thru... Once penetrated, I can feel the clay liner with my drill bit. So the block is likely hollow.
I don't supposed glueing a piece of board to the block with construction adhesive is adequate? If I was able to do that I would be able to affix the 1900 box to the board.
What do you suggest?
Drilled into the block to attach an anchor to it and the "cinderblock" (not sure what the material is now). Is only like a 1" at best. My masonary bit went right thru... Once penetrated, I can feel the clay liner with my drill bit. So the block is likely hollow.
I don't supposed glueing a piece of board to the block with construction adhesive is adequate? If I was able to do that I would be able to affix the 1900 box to the board.
What do you suggest?
#5
08-09-14, 01:10 PM
I wasnt using tapcons, I was going to use a 1.25 plastic anchor and masonary screw. The hole I was drilling was for the plastic anchor. I don't think that will be very secure though.
Is the glued board not a good idea?
Is the glued board not a good idea?
#7
08-09-14, 01:50 PM
Is there anything in the NEC about mounting junction boxes and the material used?
I mean I know I will have no problem glueing a backer board to the block and screwing a box to it.
But I want to know if its legit. Or if that would be considered sloppy.
Also the idea that wood would be touching an active chimney ... About 2' from the intended junction box is where my water heater flue enters the block into a clay liner.
I mean I know I will have no problem glueing a backer board to the block and screwing a box to it.
But I want to know if its legit. Or if that would be considered sloppy.
Also the idea that wood would be touching an active chimney ... About 2' from the intended junction box is where my water heater flue enters the block into a clay liner.
#8
08-09-14, 02:07 PM
I don't know where on the chimney you are placing the receptacle, nor what you may or may not be covering the chimney block with, if anything. The code will require they be attached. No mention of method is made. Sloppy, probably depending on the location, and who will be seeing it. Your chimney block does not (should not) contain heat, as it is taken up via either terra cotta pipe (old) or metal piping. You must maintain 3" of clearance from combustible surfaces.
#9
08-09-14, 06:23 PM
Member
Once penetrated, I can feel the clay liner with my drill bit. So the block is likely hollow.
#11
08-10-14, 04:35 AM
I doubt what you felt was the clay liner and probably a partition in the block. I would have used that hole and however many more I needed for the plastic anchors.
My bit went right thru that block like butter... if I were to stick a screwdriver in the hole that I drilled I likely could chip away at the brick easily. I am not sure that will be secure. I have 4 holes in the box I can drill for but they are rather close and I fear damaging the cinderblock.
The conduit is all supported well. There is about 4' between this box and another junction box. That junction box is securely fastened to a floor joist and I have 2 mini hanger holding the pipe to the joists between. I just need a little help holding the box flush with the cinderblock rather than full on supporting it from the cinderblock.
#13
08-10-14, 07:22 AM
Plastic anchors with 1" screws are fine to mount a metal box to masonry.
yes
tapcons are great....2 is better then 1....4 is better then 2.............
i use flat head tapcons inside metal 4 in sq boxes because the hex heads cut into the wire insulation and short out sometimes.
Is it acceptable to mount a junction box/outlet on the exterior of a chimney on cinderblock with tapcons or cement anchors?
tapcons are great....2 is better then 1....4 is better then 2.............
i use flat head tapcons inside metal 4 in sq boxes because the hex heads cut into the wire insulation and short out sometimes.
