Latest Discussions : Basement & Foundation


11:23AM | 05/05/14
I have an unfinished basement room approx 33ft x12ft that has a dirt floor(covered by a vapour barier) i.e crushed stone. I

am planning to have a concrete floor poured, but am hesitating to pull the trigger becuase of some water issues I have had

(in this space only).

The room itself has a perimetwer french drain that drians into a sump hole that is located outside the house(one of the

walls is an outside wall). I was told by the previous home owner that he had tried to install the sump pump inside the

room, but that the issue persisted, so he had an additional sump hole made on the outside which is where the pump is

located. One point to note is that I have not had any freezing issues the past two winters maybe due to the depth of the


The dirt floor is around 3-4 ft below grade, and the floors of the adjoing rooms(which has concrete & where there are no

water issues) are about 1ft higher. My goal is to find the right balance between keeping the floor as low as possible(to

get the room height) and avoiding water issues. With the sump pump running the room seems to stay dry, but that means

elevated electric bills since the pump seems to run almost all the time.

Some of the questions I am trying to work through are -
a. Should I pour a concrete floor 6 inch thick or add two inches of crushed gravel and 5 inches of concrete.
b. Is the french drain too low, should it be a little raised. My fear is that if its too low it will pick up the natural

ground water very easily thus needing the sump pump to operate endlessly. We do have a high water table.
c. Is it better to pour one continious floor and leave the sump hole to be outside the house rather than cut a hole inside

the house(thus providing a weak spot for the water to seap through).
d. Will pouring a floor(thus adding resistance) push the water levels lower thus avoiding the frensh drains from picking up

ground water as easily as it does today?
e. Are there sump pump solutions that have a low operating cost if the pump were to run 24/7/365 to drain the water. Does

it makes sence(financialy) in the long run to find a solution that minimizes the need for the sump pumps.
f. What other options do I have?
g. Given that the walls are an older pour, are there any "selaer" materials that may be used to avoid water from seeping

through the seams where the old concrete walls meet the new floor.

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