strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
(OP)
Hello,
1-Could anyone help me please identify the strip width normally used for underpinning a two story house?
2-In addition to that I need to add a door to the crawl space since the only entrance is from inside.
3-Is there any recommendation or links how to proceed making that door without risking any settlement of the foundations?
4-Do we need to add Keyways between the strips?
5-What is the best way to seal the joints between those strips?
Thank you very much for your help?
1-Could anyone help me please identify the strip width normally used for underpinning a two story house?
2-In addition to that I need to add a door to the crawl space since the only entrance is from inside.
3-Is there any recommendation or links how to proceed making that door without risking any settlement of the foundations?
4-Do we need to add Keyways between the strips?
5-What is the best way to seal the joints between those strips?
Thank you very much for your help?





RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
If anyone can clarify please if there is a faster way because this procedure requires everytime the concrete to get cured before digging again the full opening.?
Thanks
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
One time we removed the rubblestone from the doorway area right up to the underside of the floor joists (approximately 42"x84") and then provided a steel frame around to support the floor and stiffen up the walls laterally. The owner needed a custom cut door to fit the opening as by the time it was done the door rough opening was just less than 6'-6".
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
It's also a function of wall height.
Call a few of the underpinning contractors in the area and see what they recommend.
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
1 - Strip width will likely be influenced by the size of the stones used in the foundation. Where is the project located?
2 - Adding a door is possible but this question is tough to address without knowing the nature of the framing that bears on the foundation.
3 - Underpinning is never without some risk of settlement.
4 - Horizontal keyways would be advisable.
5 - Hydrophilic waterstop (Volclay RX or similar) is probably the easiest, although with a rubble foundation you may still experience some ground water infiltration. Since it sounds like you will be exposing the entire foundation an exterior ground water control method may be in order (stone + perforated pipe to daylight).
Ralph
Structures Consulting
Northeast USA
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
www.PeirceEngineering.com
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
The property is in montreal, i was thinking to do like french drain with a sump pit somewhere to take all the water. The house has brick siding.
I assume there is a need to have some reinforcements for shrinkage that do not need to have a development length, otherwise it will be difficult to for the contractor to do.
The only concern is that the underpinned foundations will be working with no integrity due to the fact of having a joint every 4 ft.
Based on your experience is there any problem with that. The crawl space needs to be extended by 4 ft.
Thanks
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
If you are underpinning in order to deepen a crawlspace into a basement, your bigger problem will be providing lateral support for the underpinning and the original rubble stone which will remain above the underpinning.
www.PeirceEngineering.com
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
You really can't brace the underpinning. If you could extend the underpinning up in front of the rubble stone wall, you cold possible use the floor joists to brace the underpinning but that would require reinforcing steel and the underpinning would still have to extend into the basement in order to brace the front of the rubble stone wall.
Last, but probably least desirable, you could tie back the underpinning piers with tieback anchors (e.g. helicals, manta rays, grouted anchors, etc.).
www.PeirceEngineering.com
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation
RE: strip width of underpinning a crawl space and transferring it to a basement: Rubble stone foundation