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poet2dager 08-16-2010 07:48 AM

Applying flagstone to cinder blocks
I am building an above ground pond, I bought flagstone hoping to place it on the wall of the pond to make it look more natural. I am trying to find a good material to use to get the flagstone to stick to the wall, all the larger pieces will be flush with the ground so what I use doesn't need to support a large amount of weight. I have heard an idea on thin-set, stuff for laying granite and marble, but I wanted to get some more opinions. I am new to most of this stuff, but if someone could point me in the right direction, it would be greatly appreciated.


CraigFL 08-16-2010 01:43 PM

You say "flagstone" but we need to know if is man-made for veneering or actual/natural flagstone. Veneer stone would be lighter and easier to apply. Also, what kind of surface is the pond?

poet2dager 08-16-2010 07:32 PM

It is natural flag stone, and most of the pieces are 1 1/2 inches thick, as far as the surface of the pond, it has a small small concrete layer with cinder blocks going around it as a wall, this wont be an in ground pond. the cinder blocks have mortar on them to connect them to each other. I have gotten this far but am not sure what would be the best way to finish it. I just need to put the liner in and attach the flag stone to the cinder block wall, it is only one cinder block in height.

itsreallyconc 08-17-2010 04:46 AM

fit the flag onto the exposed part of the conc base & slap 'em on w/mortar,,, just be certain the block's CLEAN 1st.

oldognewtrick 08-17-2010 06:08 AM

I am curious as to how you are going to water proof the walls. Are you going to use a liner or try and seal the block somehow?

itsreallyconc 08-17-2010 06:53 AM

maybe i miss'd something,,, ' just need to put the liner in and attach the flag '

poet2dager 08-17-2010 07:10 AM

yes, I am using a pond liner, cinder blocks are just to add support and some height so the water won't be too shallow and heat up the pond during our hot afternoons.

Itsreallyconc: my first plan was to clean the blocks get some mortar and like you said, slap them on after fitting them, but I wasn't sure if the mortar would be sticky enough to hold up the blocks until it dries.

itsreallyconc 08-17-2010 07:58 AM

if i'm reading your op correctly, there's a bit of the conc footer showing,,, the mortar will hold the vertical pcs of flag but not suspend them as it would act if you were to face a home for instance.

we'd use a mortar bag to fill the jnts 'tween the flag then ' tool ' the jnt as you would w/any brick/stone/mortar work.

poet2dager 08-17-2010 09:37 AM

I am probably at the lowest level of knowledge about masonry, would you mind explaining what ( 'tool' the joint) means? or maybe direct me to a website that could help?

itsreallyconc 08-17-2010 10:11 AM

hie thyself over to an apro0n store & buy a book on stone/brick work,,, you should see a picture & description of joint ' tooling ',,, probably easier finding it there than the library.

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