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ok looks like you have given me the idea i needed to see. mortarless is what i want to do. seeing your work so far, this is going to be obtainable on my end. the mods to the brick saw are doable. but if need be i already have a plan in mind to make a one handed brick breaker. with a breaker and a stationary grinder i can do it. now just to get back from texas and it will happen.
Travis
Do not meddle in the affairs of dragons, for you are crunchy and taste
like chicken...
the number one reason for arch problems is removing the forms too early.
Christo
What is ideal? This seems to be of controversy. Some threads are saying to pull the forms right away, to see if the arch is self supporting, not needing mortar to hold it in place. Other threads argue to keep the forms in until mortar cures well.
My vote is for leaving the forms in. Mainly because I'll not be confident enough in my own masonry work to trust it.
I would tend to leave them in for a day or two at least. Longer if they are supporting more weight than the arch itself (or will support more in the next day or two).
Cement does not reach a reasonable strength for a couple days and then does not reach full strength for something closer to 20 days after that....
Well I had a few days down time as my transplanted girlfriend was in town for a visit but I did manage to score an ancient bread oven door and i should get it in about a week..
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