Time to wait before foundation wall is strong enough to move house on
Time to wait before foundation wall is strong enough to move house on
(OP)
Hi there,
It seems to me like finding the answer to the question above is a black art on its own, but I'll throw it out there in hopes that someone can give me a more definite answer.
The basement I plan on building will be formed using IFC block (3" Styrofoam/side 6" gap for concrete) at a height of 10ft. The dimensions are 46' X 26' roughly and the house to be moved on is a bungalow. I understand that concrete needs approx 22-26 days to fully cure, however my dad (civil engineer) suggested that my house could be moved on merely 3 days after the pour (this does not include backfilling). Is 3 days enough time?
Another question I have is that I have been assured that the 6" of concrete within the IFC is up to code for a 10ft high foundation wall, however all my findings seem state that 8" - 10" thick walls are required for that height. The basement will only be backfilled 6ft.
Thank you for your time,
Frazer RM Ross
It seems to me like finding the answer to the question above is a black art on its own, but I'll throw it out there in hopes that someone can give me a more definite answer.
The basement I plan on building will be formed using IFC block (3" Styrofoam/side 6" gap for concrete) at a height of 10ft. The dimensions are 46' X 26' roughly and the house to be moved on is a bungalow. I understand that concrete needs approx 22-26 days to fully cure, however my dad (civil engineer) suggested that my house could be moved on merely 3 days after the pour (this does not include backfilling). Is 3 days enough time?
Another question I have is that I have been assured that the 6" of concrete within the IFC is up to code for a 10ft high foundation wall, however all my findings seem state that 8" - 10" thick walls are required for that height. The basement will only be backfilled 6ft.
Thank you for your time,
Frazer RM Ross





RE: Time to wait before foundation wall is strong enough to move house on
If designed correctly for the loading, 3 days might be possible - but this is highly dependant upon the concrete mix design including any admixtures proposed to be used for your foundation as well as temperature during the 3 day cure. For typical concrete, 3-day strength might be about 50% of the full 28 day strength. I usually require a week or ask the contractor to provide results from a compressive strength test (break a cylinder) to prove that the concrete has reached it's design strength.
RE: Time to wait before foundation wall is strong enough to move house on
Many framers will get on a foundation after a day or two - but those loads are minimal and they are trying to get the floor on so they begin back filling.
I would wait at least a week or get tests like cvg recommended
RE: Time to wait before foundation wall is strong enough to move house on
RE: Time to wait before foundation wall is strong enough to move house on
http
From what I can gather from page 5, it looks like the 6" basement walls are structurally acceptable for 3.07 meter heights, given that I place enough reinforcement (although, I don't know what 15M @ 406 means, (size of rebar at X distances?)).
Yes, the MD granted me a building permit in which the application specified the ICF block I would use.
As for 10ft tall walls? The extra cost is minimal to what I consider to be beneficial of having a high wall.
Cheers,
Frazer
RE: Time to wait before foundation wall is strong enough to move house on
Also, you could have a lot of cylinders made, and start breaking them early. You would have to know what strength you need to at least support the dead load. Using a high early strength mix, or a stronger mix would help reduce the time.
RE: Time to wait before foundation wall is strong enough to move house on
"The concrete must be cured a minimum of seven days before backfilling. The top of the
foundation wall must be supported by the first floor prior to backfilling.
For the wall heights indicated in tables 1a, 1b, 2a and 2b, the pouring of concrete must be done at a rate of 1.2 m/h in consecutive lifts; each lift is limited to a maximum height of 1.3 m."
RE: Time to wait before foundation wall is strong enough to move house on
RE: Time to wait before foundation wall is strong enough to move house on