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How do I undercut a stone fireplace? Walter R. 04-28-2007
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Posted by Walter R. on April 28, 2007, 7:59 pm


I am putting wood planking in my living room. Some of the planks will butt
against the fireplace hearth, which consists of petrified wood set in
mortar. The area where the stones meet the concrete pad is very irregular
due to the irregular shaped stones. The floor is a concrete pad.

For a neat installation and in order to provide for some expansion, I will
need to undercut the fireplace hearth by 1/2" so that I can slip the ends of
the planks under the stones.

http://tinypic.com/view.php?pic=48zmrsh

I have a 4" electric grinder. Will that be suitable for cutting a 1/2"
undercut into the rocks? What kind of blade(s) should I use? I bet this is
going to be a very dusty affair!?

Any advice appreciated

--
Walter
www.rationality.net
-



--
Posted via a free Usenet account from http://www.teranews.com


Posted by Edwin Pawlowski on April 28, 2007, 10:05 pm



> For a neat installation and in order to provide for some expansion, I
> will need to undercut the fireplace hearth by 1/2" so that I can slip the
> ends of the planks under the stones.
>
> http://tinypic.com/view.php?pic=48zmrsh
>
> I have a 4" electric grinder. Will that be suitable for cutting a 1/2"
> undercut into the rocks? What kind of blade(s) should I use? I bet this is
> going to be a very dusty affair!?

You cannot imagine the amount of dust. Considering the location, the entire
amount of material removed is probably going to be made into dust rather
than cut out. You need an abrasive blade. Just get one because by the time
you cut a few inches, you'll probably see it is a bad, messy, idea. Butt he
wood and come up with a trim strip of some sort.



Posted by Walter R. on April 28, 2007, 10:32 pm


Thanks, Ed

Would a 4" diamond blade reduce the dust and cut a thin slice? Can I reduce
the dust and enhance the cutting action by having my wife cover the area
with a water mist/spray?

http://tinypic.com/view.php?pic=2v2uo84


--
Walter
www.rationality.net
-
>
>> For a neat installation and in order to provide for some expansion, I
>> will need to undercut the fireplace hearth by 1/2" so that I can slip the
>> ends of the planks under the stones.
>>
>> http://tinypic.com/view.php?pic=48zmrsh
>>
>> I have a 4" electric grinder. Will that be suitable for cutting a 1/2"
>> undercut into the rocks? What kind of blade(s) should I use? I bet this
>> is going to be a very dusty affair!?
>
> You cannot imagine the amount of dust. Considering the location, the
> entire amount of material removed is probably going to be made into dust
> rather than cut out. You need an abrasive blade. Just get one because by
> the time you cut a few inches, you'll probably see it is a bad, messy,
> idea. Butt he wood and come up with a trim strip of some sort.
>



--
Posted via a free Usenet account from http://www.teranews.com


Posted by Harry K on April 28, 2007, 10:40 pm


> Thanks, Ed
>
> Would a 4" diamond blade reduce the dust and cut a thin slice? Can I reduce
> the dust and enhance the cutting action by having my wife cover the area
> with a water mist/spray?
>
> http://tinypic.com/view.php?pic=2v2uo84
>
> --
> Walterwww.rationality.net
>
>
>
>
>
>
>
>
> >> For a neat installation and in order to provide for some expansion, I
> >> will need to undercut the fireplace hearth by 1/2" so that I can slip the
> >> ends of the planks under the stones.
>
> >>http://tinypic.com/view.php?pic=48zmrsh
>
> >> I have a 4" electric grinder. Will that be suitable for cutting a 1/2"
> >> undercut into the rocks? What kind of blade(s) should I use? I bet this
> >> is going to be a very dusty affair!?
>
> > You cannot imagine the amount of dust. Considering the location, the
> > entire amount of material removed is probably going to be made into dust
> > rather than cut out. You need an abrasive blade. Just get one because by
> > the time you cut a few inches, you'll probably see it is a bad, messy,
> > idea. Butt he wood and come up with a trim strip of some sort.
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com- Hide quoted text
-
>
> - Show quoted text -

Unless you have a steady trickle of water running on the blade it is
going to make dusst like you have never seen. If you do have water
running on it, you will have one muddy mess that will dry to a grey
powder everywhere it runs. BTDT but fortunately outside. Take the
advice given above and use a trim strip to cover the gap.

Harry K


Posted by aemeijers on April 29, 2007, 5:32 am



> Thanks, Ed
>
> Would a 4" diamond blade reduce the dust and cut a thin slice? Can I
> reduce the dust and enhance the cutting action by having my wife cover the
> area with a water mist/spray?
>
> http://tinypic.com/view.php?pic=2v2uo84
>
>
> --
> Walter
> www.rationality.net
> -
>>
>>> For a neat installation and in order to provide for some expansion, I
>>> will need to undercut the fireplace hearth by 1/2" so that I can slip
>>> the ends of the planks under the stones.
>>>
>>> http://tinypic.com/view.php?pic=48zmrsh
>>>
>>> I have a 4" electric grinder. Will that be suitable for cutting a 1/2"
>>> undercut into the rocks? What kind of blade(s) should I use? I bet this
>>> is going to be a very dusty affair!?
>>
>> You cannot imagine the amount of dust. Considering the location, the
>> entire amount of material removed is probably going to be made into dust
>> rather than cut out. You need an abrasive blade. Just get one because by
>> the time you cut a few inches, you'll probably see it is a bad, messy,
>> idea. Butt he wood and come up with a trim strip of some sort.
>>
>
Agreed. If this is a floating floor, or if you expect it to expand and
contract that much, put a kerf in the trim strip so it rides over the
flooring, with a bullnose on top to avoid splinters. Scribe the fireplace
side to match the stonework. Having a trim strip 1/4" taller than floor will
barely be noticable. Trying to put a kerf in the existing stone is just
asking for trouble.

aem sends....



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