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  #11  
Old 06-15-2012, 07:33 PM
david s's Avatar
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Default Re: New builder - use lintels for hearth base

Buying pre-mixed bags is way more expensive (at least it is here) than buying the sand and aggregate at a landscaping supplies place. If you fill 20 litre drums you can transport them in a sedan in a few trips.
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Old 06-16-2012, 06:04 AM
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Thumbs up Re: New builder - use lintels for hearth base

One advantage to using a well chosen prepackaged concrete product is that the proportions of ingredients will be consistent and correct. That could be important to your doing this for the first time.

Premixed bags are also less mess in the back seat of the car It won't cost that much more....Its a Small percentage of the total cost to go ahead and use the premixed bags. I say go with it and use the bags for your first concrete experience. Buy the components separately next project.
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  #13  
Old 06-16-2012, 11:41 PM
dvm dvm is offline
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Default Re: New builder - use lintels for hearth base

We poured our hearth this morning - I got a one bag cement mixer from Harbor Freight for around $150. Portable Electric Cement Mixer - 1-1/4 Cubic Ft. I will use the heck out of it on this project then probably sell it. A few small points my sons (20 and 13 years old) and I worked out.
1) Using bagged pre-mix: mix a few bags slowly to calculate the right amount of water needed per bag - mark this volume on a bucket.
2) start with 3/4 the water needed in the mixer
3) cut across the middle of the (90 pound) bag the short direction and lift below the cut - you will end up with two open paper sacs - each holding about 45 pounds of premix
4) dump in one "half bag", then the second (easier than pouring from a 90 pound bag into a small mixer) and add the final bit of water.
5) we then dumped into several 2 gallon buckets for transport (my 13 year old would not have lifted a 5 gal bucket)
We also purchased and uses a concrete vibrator. 3/4 HP Concrete VibratorI don't know how necessary this is, but it absolutely settles the wet cement into the form quickly.
I know I am making memories with my sons they will remember (my dad was also in town and lifted a few buckets) - it was a good day. Good Luck.
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Last edited by dvm; 06-17-2012 at 08:27 PM.
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  #14  
Old 06-25-2012, 04:39 AM
Serf
 
Join Date: Jun 2012
Location: Hampshire, UK
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Default Re: New builder - use lintels for hearth base

Hi Robb

We used reinforced concrete lintels for our hearth base. There are two steel reinforcing bars present in each.

xcm length to cover the distance of the block work by 210mm x 75mm.

They do the job and it has saved a load of hassle
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