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Recipricating saw or angle grinder to cut cement board?

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Recipricating saw or angle grinder to cut cement board? MiamiCuse 02-02-2008
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Posted by MiamiCuse on February 2, 2008, 11:09 pm
I am remodeling this 35 year old house and throughout the house the walls
are made of a double layer of gypsum board as the layer underneath and a
layer of plaster / cement material on top. Total thickness is about 3/4".

http://i173.photobucket.com/albums/w67/143house/P1010626.jpg

This presents a problem in matching new wall with existing. If I use the
standard 3/8" or 1/2" wall board it will not match. I could use them in
areas where I torn down the entire wall from end to end, but in other areas
I have to match the existing thickness. I guess I have three options:

(1) Use one layer of 3/4" sheetrock and try to match it, or
(2) Use two layers of 3/8" sheetrock, or
(3) Furr out wall a bit to use one layer 3/8" wall board

Not sure which one is the most convenient and economical.

Also, electricians, plumbers, window installers have worked on the house and
there are numerous places I need to make a patch but the patching is
impossible since the cuts are done in an irregular fashion. See pic:

http://i173.photobucket.com/albums/w67/143house/P1010625.jpg

I try to cut them on a straight line and it's hopeless. Can't use a
recipricating saw because of the concrete layer underneath. Tried a angle
grinder and there were so much dust I could not stand it. Any advise?

Thanks,

Sum



Posted by dadiOH on February 3, 2008, 6:12 am
MiamiCuse wrote:

> Also, electricians, plumbers, window installers have worked on the
> house and there are numerous places I need to make a patch but the
> patching is impossible since the cuts are done in an irregular
> fashion. See pic:
>
> http://i173.photobucket.com/albums/w67/143house/P1010625.jpg
>
> I try to cut them on a straight line and it's hopeless. Can't use a
> recipricating saw because of the concrete layer underneath. Tried
> a angle grinder and there were so much dust I could not stand it.
> Any advise?

Plaster?


--

dadiOH
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...a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico




Posted by Mikepier on February 3, 2008, 6:14 am
> I am remodeling this 35 year old house and throughout the house the walls
> are made of a double layer of gypsum board as the layer underneath and a
> layer of plaster / cement material on top. =A0Total thickness is about 3/4=
".
>
> http://i173.photobucket.com/albums/w67/143house/P1010626.jpg
>
> This presents a problem in matching new wall with existing. =A0If I use th=
e
> standard 3/8" or 1/2" wall board it will not match. =A0I could use them in=

> areas where I torn down the entire wall from end to end, but in other area=
s
> I have to match the existing thickness. =A0I guess I have three options:
>
> (1) Use one layer of 3/4" sheetrock and try to match it, or
> (2) Use two layers of 3/8" sheetrock, or
> (3) Furr out wall a bit to use one layer 3/8" wall board
>
> Not sure which one is the most convenient and economical.

There is no 3/4" sheetrock, only 5/8". I would think using 2 3/8"
sheetrock would be easiest.

>
> Also, electricians, plumbers, window installers have worked on the house a=
nd
> there are numerous places I need to make a patch but the patching is
> impossible since the cuts are done in an irregular fashion. =A0See pic:
>
> http://i173.photobucket.com/albums/w67/143house/P1010625.jpg
>
> I try to cut them on a straight line and it's hopeless. =A0Can't use a
> recipricating saw because of the concrete layer underneath. =A0Tried a ang=
le
> grinder and there were so much dust I could not stand it. =A0Any advise?

Use a circulating saw and adjust the thickness to 3/4". There will be
dust but it will get the job done quickly. Try wetting down the area a
bit or have a buddy hold a shop vac close to the cutting to minimize
dust.


Posted by MiamiCuse on February 6, 2008, 7:50 pm

> I am remodeling this 35 year old house and throughout the house the walls
> are made of a double layer of gypsum board as the layer underneath and a
> layer of plaster / cement material on top. Total thickness is about 3/4".
>
> http://i173.photobucket.com/albums/w67/143house/P1010626.jpg
>
> This presents a problem in matching new wall with existing. If I use the
> standard 3/8" or 1/2" wall board it will not match. I could use them in
> areas where I torn down the entire wall from end to end, but in other
> areas
> I have to match the existing thickness. I guess I have three options:
>
> (1) Use one layer of 3/4" sheetrock and try to match it, or
> (2) Use two layers of 3/8" sheetrock, or
> (3) Furr out wall a bit to use one layer 3/8" wall board
>
> Not sure which one is the most convenient and economical.

>There is no 3/4" sheetrock, only 5/8". I would think using 2 3/8"
>sheetrock would be easiest.

I might either use 2 3/8" or may be fur out the wall a bit more with 3/8"
furring strips. May be furring strips will work out better.

>
> Also, electricians, plumbers, window installers have worked on the house
> and
> there are numerous places I need to make a patch but the patching is
> impossible since the cuts are done in an irregular fashion. See pic:
>
> http://i173.photobucket.com/albums/w67/143house/P1010625.jpg
>
> I try to cut them on a straight line and it's hopeless. Can't use a
> recipricating saw because of the concrete layer underneath. Tried a angle
> grinder and there were so much dust I could not stand it. Any advise?

>Use a circulating saw and adjust the thickness to 3/4". There will be
>dust but it will get the job done quickly. Try wetting down the area a
>bit or have a buddy hold a shop vac close to the cutting to minimize
>dust.

Thanks, It's hard using circular saw moving up and down with that weight. I
wish there is a laser beam cutting tool.



Posted by SteveB on February 6, 2008, 9:44 pm
FWIW, I had to cut some stucco, which is similar to cement board. A SawZall
made terrible jagged cuts, and pulled on the stucco making fractures that
looked like a giant cobweb. I got a SkilSaw with a metal cutting blade, set
the depth properly, and breezed right through it. I did have a helper with
a vacuum to help keep the dust down, but there was still a lot.

Steve



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