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tranman 02-07-2009 06:01 PM

Rock facing for new garden shed
I'm planning on building a new garden shed out in the backyard to replace the old rusted metal shed that has been out there forever. As I began reviewing the possibilities for the outer walls, I came up with this idea:

Sheath the outer walls with OSB. Fit cement backerboard to the appropriate size. Once it is sized, lay it horizontally, spread it with mortar and use small river stone (which we have tons of) to cover the backer. I would leave small holes in the stone coverage in which to attach the board to the OSB and studs. Once dry, screw the stone board into the OSB and studs. Cover the holes/seams with additional mortar and stones.

It would have a rustic look, maybe top it off with green shingles to mimic a thatched or sown roof.

What does everyone think? Any issues/problems that any can see with my idea?


Tom Struble 02-07-2009 10:57 PM

sounds like a cool project i dont see anything wrong whith doing it that way post some pics when your done good luck

Bob Mariani 02-08-2009 08:25 AM

Good plan. I even make full width field stone walls that we prefab and set in place in a similar fashion. But OSB would not be a good fit. Use exterior plywood, and cover with 30 LB felt.

Ron6519 02-08-2009 01:53 PM

This sounds like a massively heavy unit, on a flexible substrate, with too few connections between the backerboard and the framing. You don't mention what will replace a brick ledge like support for this stone.
This seems like an under engineered project.

tranman 02-08-2009 04:14 PM

Well, I'm encouraged by the responses. I plan on building the frame for the shed with standard 2X4 studs.

Bob, so I can skip the cement backerboard if I use exterior plywood and wrap with 30 pound felt? What about a wire lath underneath also?

Ron, I'm a little confused by your answer. We intend to use the river stone imbedded in the mortar as a facing for the walls, on top of a standard 16" on center timber frame. Still have concerns?

Thanks for all of your input. I plan to start the demo of the old shed soon and the construction of the new one soon after, depending on the weather. I'm still not settled on the rock facing choice, but I am leaning toward the option. I will definitely take pictures, and I appreciate the input and alternatives.


Bob Mariani 02-08-2009 05:07 PM

The brick ledge mentioned is an extension of the footing used to support the bottom of a rock veneered wall. Also mentioned was the weight which is why this footing is wider when this siding is used. But, if you have no such foundation which you may not for a garden shed you can get by with creating the ledger with 2 X 4 angle steel wrapped in lead flashing. Since you planned on mortaring the stones to a backer board and fastening the backer board to the studs you should be able to support this with no extra work on the foundation. I assume you are not insulating this building, this brings forth more issues you will need to deal with. And Yes you still need the backer board. 2 X 4 walls. Pressure treated sole plate. Double top plate. blocking to help prevent twisting. 3/4 plywood screwed and glued to the studs. #30 felt. 1/2 cement backer board (easier) or wire lath, mortar, stone, mortar grout, sealer.. your done. Also use some brick ties with the CBU on any larger stones.

tranman 02-08-2009 07:00 PM

I am planning on installing the shed on an already-existing concrete pad. This would make the brick footer unnecessary, correct?

I will use pressure-treated for the bottom sill.

Bob Mariani 02-09-2009 06:17 AM

An existing pad will not be sufficient to support a stone facade. Expect some cracking down the line. A footer needs to be a minimum of 12" deep, this pad is most likely only 4" If you want to do it right you can pour a new foundation around the pad to properly support such a heavy wall.

Tom Struble 02-09-2009 07:57 AM

culture stone doesn't require a brick ledge

Bob Mariani 02-09-2009 08:08 AM


Originally Posted by strublesiding@optonline.n (Post 227595)
culture stone doesn't require a brick ledge

True but he did say he would be using real stones from his property.

Ron6519 02-09-2009 08:09 AM


Originally Posted by strublesiding@optonline.n (Post 227595)
culture stone doesn't require a brick ledge

He's using ,"river stone" he has on his property.

tranman 02-09-2009 01:44 PM

River stone is roughly round, 1"-1 1/2" in diameter. Weight still an issue?

Bob Mariani 02-09-2009 01:53 PM

No these are small ones. Weight is aprox. 35 lbs a sq ft there. Load on this pad foundation will handle 750/lbs easily.

Tscarborough 02-09-2009 02:02 PM

Why would you not lath the building, mud it and stick the rocks in?

Bob Mariani 02-09-2009 02:36 PM

I believe what his intention was to pre-fab the wall panels. It is very fast to place these on the ground and then fasten the panel.

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