Don't know the terminology; *sticking* maybe? I am making a ac hole in wall
smaller so I pour the bottom and did the sides. now I need to do the
*roof/ceiling* of the hole.. it has eight inch blocks..some spaces to fill
in em. What is the correct mix so when I apply the cement, gravity doesn't
win all the time.
Someone told me cement, lime and sand will do it..I wasn't using lime so
that may be the case. if so what are the proportions and/or any other ideas?
How to do it:
* Buy the premixed concrete.
* Add water until it's the consistency of peanut butter or thicker.
* Apply the concrete to the top of the hole.
* Put a wood form underneath to keep it from falling down.
Why do you need to fill in the top? I'd just fasten the junction box in
the wall and leave it at that. (You do know that a junction box is
required, don't you?) If I needed insulation, I'd shoot some expanding
foam around it.
No junction box. it's a wall unit air condition, it slides right in the
You say: apply concrete to top of hole, then put wood to keep it from
falling down..if it hasn't fallen down before I put the wood I don't need to
put the wood.
I'm sorry. I thought you were making an opening for an AC (alternating
current) junction box opening smaller. Chuckles all round. :-) In that
case, you would have forced the concrete into the top of the hole, then
put in a piece of wood to keep it from slowly sagging. The small amount
of very thick concrete would have stayed in place long enough to get
some support under it.
Build a wooden form. Somehow (how I don't know) get the concrete into
the form on top of the wood. This sounds difficult.
I suggest you just insulate the inside of your concrete blocks with
expandable foam, then add wood trim to make the opening the right size
for your air conditioner. Finish off with some door casing to hide the
edges of the opening.
On Tue, 21 Oct 2008 02:50:39 +0000 (UTC), "SteveBell"
Another way would be to frame the bottom piece, and one side. Then
fill that space with a very dry mix, and slap on the other side when
the space is filled. A couple of big C clamps could be used to hold
the side on as the mix set.
In some cases I have drilled small holes with masonary drill bit (rotary
hammer drill) in the concrete hole area and attached any metal screws and
hardware cloth to give concrete a "web" like mesh to hold concrete.......
Dry pack is the term we use.......Hardly any water in the concrete mix....
Push it into the mesh.......dont worry about finishing it smooth. do a rough
job and come back later with a creme concrete and touch it up.
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