First time posting on this site. My apologies if this is the wrong place for this post. I am a residential home designer and I currently have a client who wants to have their 5' deep crawlspace lowered to 8' deep. A specialized foundation contractor has proposed underpinning the foundation. Their proposal however is varying from what I understand to be the typical practice. The contractor is proposing to only excavate and underpin to the exterior face of the 8" foundation wall (not the full depth to the exterior face of the footing (as seems to be typical practice). He is proposing that the underpinning have a monolithic footing at the bottom of the new wall. He will vibrate the whole form, no dry pack at the top. He is proposing that the new drainage mat, rather than being placed on the inside of the new underpinning, be placed on the exterior of the new underpinning, before forming and down under the new proposed monolithic footing, this also seems to vary from standard practice. And lastly he has proposed that approach pits be made in 6' widths as opposed to 4'widths (2 stage sequence) as would be typical. Any problems with this foreseeable construction, does anyone here recognize this a a standard or precedented way to underpin a residence. Is it reasonable for residential underpinning? I have attached a sketch to help clarify, the footing in the sketch is shown as being only to the interior, however it may be the intention of the contractor to dig out a footing projection on the exterior side too. Existing foundation dates from 1970 is cast in place concrete, with a presumably 20" to 24" wide footing.
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