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Old 07-03-2013, 05:27 PM
CK82 CK82 is offline
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Brick fireplace & woodbox

I am curious how you fellas support a brick paver or wall block top on a fireplace, or wood box, etc., that does not have support beneath? The main framing of the fireplace and wood box are of concrete construction block mortared and set. Generally there are areas across the top that have no support from the outer concrete block framing/foundation, thus what do you use to support each block across the top? We have done grilling stations before and I used angle iron across the an opening for an access door to support the block above. Is this generally how things are done? Using any sort of lumber/wood is out of the question. The only other option I can think of is to pour a concrete top and veneer it with brick.

Please provide any professional knowledge, it will be greatly appreciated!

Thanks, Chris
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Old 07-03-2013, 05:34 PM
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alldayrj alldayrj is offline
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We use steel lintels. A poured top would work too but i would use wire or rebar
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Old 07-03-2013, 05:52 PM
CK82 CK82 is offline
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That makes complete sense, thank you. Would you guys recommend setting the construction block with rebar and fill with concrete? Or is this not completely necessary?
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Old 07-03-2013, 08:49 PM
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alldayrj alldayrj is offline
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You can put two lintels back to back, brick on the front and form a slab off the back. Crib the form up so you can knock out wedges and drop the form after. Filling the block is a good idea, rebar is cheap peace of mind.
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Old 07-05-2013, 12:13 PM
CK82 CK82 is offline
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Alldayrj thank you for your help. By cribbing the form, basically you mean support it from beneath until poured and cured, then knock out the supports/crib?

Also in order to fill the blocks properly do you have to fill each course as you go? I would imagine that would be the case, same as backfilling retaining wall block.

Thanks, Chris
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Old 07-05-2013, 12:32 PM
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alldayrj alldayrj is offline
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If your cells stack clean you can fill 2 courses at a time. It can be a weak mix, nothing special.

I wish i had pictures of the forms, i had to form a room under a loading dock for a hydraulic pump for a lift. Just use 3/4" ply for the top, maybe two layers depending on size. Then use 2x4s standing up and resting on a smaller 2x4 so you can smack the block away and the form will drop
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Old 07-15-2013, 12:16 PM
CK82 CK82 is offline
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Very cool. Thanks alldayrj.
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