Correct cement mix for ..

Posted by reqluq on October 20, 2008, 3:31 pm

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?
thanks
req

Posted by SteveBell on October 20, 2008, 5:59 pm

reqluq wrote:

> 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? thanks
> req

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.

Pertinent question:
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.

--
Steve Bell
New Life Home Improvement
Arlington, TX

Posted by reqluq on October 20, 2008, 7:41 pm

No junction box. it's a wall unit air condition, it slides right in the
hole.
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.
req

> reqluq wrote:

>> 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? thanks
>> req

> 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.
> Pertinent question:
> 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.
> --
> Steve Bell
> New Life Home Improvement
> Arlington, TX

Posted by SteveBell on October 20, 2008, 10:50 pm

reqluq wrote:

> > reqluq wrote:
> >

> > > 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? thanks req

> >
> > 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.
> >
> > Pertinent question:
> > 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 hole. 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.

On topic:
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.

--
Steve Bell
New Life Home Improvement
Arlington, TX

Posted by Erik Dillenkofer on October 21, 2008, 5:22 am

How about installing a form board across the top of the hole, drilling holes
into the block "voids", pouring concrete into those holes, then patching the
holes?

> reqluq wrote:

>> > reqluq wrote:
>> > > 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? thanks req
>> > 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.
>> > Pertinent question:
>> > 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 hole. 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.
> On topic:
> 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.
> --
> Steve Bell
> New Life Home Improvement
> Arlington, TX

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