Old 08-20-2011, 07:15 PM
Join Date: Jun 2009
Location: Westchester
Posts: 134
Default support for bottom tray of form

Should the legs for the bottom tray of the form for the structural layer of hearth be screwed to the frame? Or does the frame just rest on the legs? This would make it easier to remove the form after it cures, but I suppose it could all fall down with the weight of concrete when it's poured which would be pretty bad.
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Old 08-20-2011, 11:11 PM
david s's Avatar
Il Pizzaiolo
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 5,152
Default Re: support for bottom tray of form

I would be just resting it on the supports, but use some thin wooden wedges that you can tap in under the supports to make micro adjustments for height.These also facilitate removal of the supports without stressing the cast slab when you take them out. The weight of the poured concrete holds everything in place. If you have any gaps more than 1/8" they can be sealed very effectively with some clay, if you have any at hand.
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Old 08-21-2011, 05:40 AM
NYC NYC is offline
Join Date: Jun 2011
Location: NYC
Posts: 110
Default Re: support for bottom tray of form

If you build a solid frame with cross beams you can just support the joint, center and corners with 4x4's on shims and then just knock them out and the plywood will drop down. Rub some diesel fuel or vegetable oil on the plywood and side forms to keep the concrete from bonding to them. It makes removing very easy.
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Old 08-22-2011, 10:03 PM
Mike D's Avatar
Join Date: Oct 2010
Location: Berkeley, Ca.
Posts: 342
Default Re: support for bottom tray of form

Diesel Fuel? Really? A little early to start the curing process.

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