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Looking For A Smart Ass

 
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Old 05-21-2010, 07:04 AM   #1
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Looking For A Smart Ass


hi im looking for a way to hang a mantle to a rammed earth fire place

its about 6' 6'' long 10'' deep and 7'' thick its a rustic peice of jarrah with a wavy edge

other than drilling a hole and inserting chemical anchor into the rammed earth and then trying to align it up to corresponding holes in the back of the mantle i cant think of a better way right now

this sucker ways 130lbs i put it on the bathroom scales

thanks in advance for any ideas

ps rammed earth is quite soft and she who must be obeyed dose not want brackets or chains
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Old 05-21-2010, 08:00 AM   #2
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Re: Looking For A Smart Ass


She who must be obeyed needs to make a decision. To have or not to have a mantle. If you shoot down the only viable option, the anchor, and she wants no brackets or fasteners showing and you can't glue it. Maybe just lean it up against it and tell her to be careful it doesn't tip over and crush her while shes cleaning it.

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Old 05-21-2010, 09:13 AM   #3
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Re: Looking For A Smart Ass


"looking for a smart ass "

I can be one when the conditions are right!

The easiest way to do it would be to make a template out of scrap plywood ( or 1x) the same width, & ht as the back side of the mantle.
Then do a hole layout on the template, taking into consideration where the holes will be in the rammed earth. I'm not familiar with rammed earth , but I assume it's very soft, so you may have to use 6 to 8, 12" (12mm?)rebar rods ( or expansion studs?) to support. At 6, each rod would only need to support #20 or so. I would probably stagger the rods from top to bottom, maximizing spacing, so as to not fracture the wall.
Once you do the layout, on the template, fasten the template to wall exactly where you want the mantle. Drill through the template & into the wall. Be sure to label the wall & mantle side of template. Once bored, fasten template to rear of mantle, & bore. All holes need to be square to the mantle, & wall. Set the rods into the wall with the template in place, using machinery grout, being sure to keep rods square to wall. I would probably keep bores a few mm bigger than the rods, in the wall, & into the mantle.

If the rammed earth won't support the 1/2" rods, you might have to install treated wood plugs into the wall to support the rods. Maybe
2" (50mm) diameter plugs would be sufficient?
Just my $.02
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Old 05-21-2010, 09:24 AM   #4
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Re: Looking For A Smart Ass


what happens if you extract a section of rammed earth wall and mix the soil with mortar mix, pack it back in. let it set, and then do some sort of pin anchoring to the mantle? Don't know how you would re-pack that stuff horizontally.


it worked great on this recurring mud puddle i had on the sidewalk to curb apron next door. From visitors driving up on the non existent curb and parking. And me making the sweep to back into my driveway. Mixed a bunch of fill with a half bag of mortar mix. Never had that mud puddle form again. Course you cant plant grass there anymore. But my neighbor don't know that. Just looks like dirt.
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Old 05-21-2010, 01:16 PM   #5
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Re: Looking For A Smart Ass


Quote:
Originally Posted by mutley View Post
hi im looking for a way to hang a mantle to a rammed earth fire place

its about 6' 6'' long 10'' deep and 7'' thick its a rustic peice of jarrah with a wavy edge

.................
Why not use a combination of a router, an angle grinder, and some chisels -- oh, and lots of hours too -- to hollow out the back of the mantle?

That would reduce the weight by maybe 50%, and would also allow for the use of maybe a french cleat, maybe a number of anchors to spread the weight around.
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Old 05-21-2010, 09:37 PM   #6
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Re: Looking For A Smart Ass


After thinking about my previous post, I think the way to go would be to bore some big holes, maybe 2 1/2", in the rammed earth. Then mortar them in with 5/8" (15 to 16 mm?) rod, using the previously mentioned template to hold everything in place while the mortar sets up. Making the holes bigger would give more support surface against the rammed earth. That way, you could get by with only four rods.
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Old 05-22-2010, 05:28 AM   #7
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Re: Looking For A Smart Ass


what a great resource this is, just good to get other ideas espesialy if you work alone

i forgot about the french cleat

think ill go with joes last idea

thans again

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Old 06-05-2010, 07:36 AM   #8
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Re: Looking For A Smart Ass


How about drilling 1" holes in the wall and mantle and using 1" dowels and an adhesive

Last edited by SK Remodeling; 06-05-2010 at 07:39 AM.
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Old 06-05-2010, 12:11 PM   #9
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Re: Looking For A Smart Ass


The job is probably done already, but another option is to use an adobe anchor. This is simply three opposing wedges of wood tapped into a hole oriented in such a way that a pulling force on the center wedge increases the wedging effect. Similar to a fox wedged mortise and tenon joint.
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Old 06-05-2010, 01:49 PM   #10
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Re: Looking For A Smart Ass


That is a cool concept Cletus. Awesome.

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Sanding is the bane of my existence
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Quote:
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