Electrical Boxes under insulation
Planning on blowing in 12″ of cellulose in the attic space. Do electrical boxes need to be raised up above the level of insulation or, if they are well-sealed, can you just leave them underneath?
Planning on blowing in 12″ of cellulose in the attic space. Do electrical boxes need to be raised up above the level of insulation or, if they are well-sealed, can you just leave them underneath?
In this FHB Podcast Segment, the crew chats about how and where to place XPS insulation in a basement.
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Replies
The question would be the wire. There is an intreresting conundrum. If you put 1.5" of wire in insulation in a top plate penetration, you need to derate that wire. On the other hand nobody seems to care if it is insulation in an attic.
The problem is usually finding those boxes if you want access later or just to avoid stepping on them. Up is better. That is hard to do in old work.
In my addition I put all of the J boxes that were not accessible from below, up on a truss member so they were easy to get to. Most of the citcuits were home run to a board with a couple big J boxes in the tall part of the attic. It meant a little more wire but I have already had to get in there (wife changed her mind) so it has already paid off.
Write on the joists above where the boxes are.
>>>Write on the joists above
>>>Write on the joists above where the boxes are.
Good idea. Or I suppose you could make up some sort of flag that sticks up out of the insulation.
I have seen
electricians and insulators use the little plastic flags on a 2' stiff wire to mark the locations of junctions under insulation... the type used by surveyors and excavators to mark spots on the ground. You can probably get them at box stores. Very civilized to think of the next guy.
We had some for our invisible dog fence, but they were too short.
but they were too short
Why? How tall is your invisible dog?
I think
he's about medium, but I wouldn't swear to it.
>>electricians and insulators
>>electricians and insulators use the little plastic flags on a 2' stiff wire to mark the locations of junctions under insulation... the type used by surveyors and excavators to mark spots on the ground. You can probably get them at box stores. Very civilized to think of the next guy.
Cool. I know exactly what you mean. We've got those 2' flags all over the place here thanks to the local trail building association (of which I'm a member).
Good idea, thanks.
The problem with those little flags is I don't wanbt to be crawling around in a dark attic with these
wire spikes sticking up everywhere.
Like Jean Sheppard says "you will put yer eye out kid"
This is why I recommend something on the joist above. Get something like a plastic file folder and cut it into pieces, write on them with a magic marker, and staple to the joists.
Just thinking about this: Why not tie a piece of pink masons line to the box (like around a wire coming out the side) and staple the other end to a joist above? That way you can follow the string down to the box.