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-   -   mudbed (https://www.johnbridge.com/vbulletin/showthread.php?t=5525)

stef 03-11-2003 09:35 PM

Today I did a mudbed for a fireplace hearth. Didn't really need it, but I built the 2x4 hearth framework 1.5 inches too low, so took the opportunity to try a mudbed for the first time.
After reading in Fine Home Building how to do a shower mudbed I mixed the concrete the same way. Very Dry.
After placing it I realized I couldn't see any reason for mixing it so dry, especially now, that it is partly cured and the corners seem somewhat friable. Maybe tomorrow it will be different.
In any event, WHY is the concrete mixed so dry?

Bud Cline 03-11-2003 09:45 PM

Your right! For "flatwork" it isn't necessary, but, when building a sloping floor it is. The dry mud can then be scraped and shaved and dressed and made really purdy.:)

You could wet yours a little if you want in hopes of "setting-off" any portland that didn't "go" the first time. It may harden it some.:)

stef 03-11-2003 09:49 PM

Thanks, Bud, for such a quick reply
So, it is sort of like making a surfboard? Put the styrofoam on and then contour it with an abrasive(trowel) to make it perfectly flat? That makes sence!
thanks again

John Bridge 03-12-2003 05:49 AM

Hi Stef, Welcome. :)

Besides what Bud said, water in concrete causes shrinkage, so less is better. The mud bed is designed to be covered with tile, and when it is, you'll have a very hard and durable hearth.

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