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Old 04-12-2011, 10:51 AM   #1
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Block/Fieldstone Foundation


I'm moving a basement door that goes through a block foundation.
The foundation is fieldstone below grade and block above grade. The door is above grade. Once I get all the blocks in, I plan to rebar and grout the blocks where I can.
When I weave the new blocks into the foundation where the door used to be, should there be some kind of mechanical fastener between the fieldstone and the block?
Also, should there be a mechanical fastener horizontally between the blocks or is the mortar enough to hold everything together?
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Old 04-12-2011, 05:06 PM   #2
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Block/Fieldstone Foundation


Mortar alone should be sufficient in this situation. Applying good skills with the placement makes all the difference though. The key is to compress the mortar adequately when laying rather than doing a bunch of tuckpointing afterwards.
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Old 04-12-2011, 09:23 PM   #3
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Block/Fieldstone Foundation


If you "toothed out" the block when you removed it, meaning you followed the path of the mortar joints and left kind of an in and out pattern with the block and didn't just cut a straight vertical line with your saw on both sides of your door your fine. You can just lay the new block in and you still keep that original staggered bond that was existing. If you just cut straight vertical lines I know an architect or engineer would make you use ties to tie the new in with the old because i've been told to do it more than once. It doesn't hurt to use ties if you just cut straight vertical lines but if you grout it solid especially where the new meets old I personally think you would be fine.
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Old 04-13-2011, 09:14 AM   #4
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Block/Fieldstone Foundation


I'll be surgically removing the blocks with a grinder so no straight lines.
For the mortor pre-mix, is type N the correct blend?
http://www.quikrete.com/ProductLines/MortarMix.asp

Also found type S:
http://www.quikrete.com/ProductLines/MasonMix.asp

Followup Edit:

Type S is required according to this video on Quikrete's website:
http://www.quikrete.com/AtHome/Video-Blockwall.asp
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Last edited by Clutchcargo; 04-13-2011 at 09:44 AM.
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