Lowering Garage Floor

First dig the trench and fill it asap with concrete to say a foot below the finshed floor or where you want the lower protion of the haunch.

Lowering garage floor.

That depends how deep the foundation walls go. For garages it is a little less simple. We are in the midst of renovating all the landscaping and masonry work in the front of the house also a very steep slope and the landscape architect has made the suggestion of lowering of the slope of the driveway by lowering the garage floor about 2 feet. If you want to go deeper than the walls extend you have to underpin the walls.

In fact for some interior floors it s just a matter of pouring leveling compound out and letting it find its own level. Firstly you would need to establish the build up of the floor and then lower the floor by the same amount and replace like for like this would require laying a new membrane. Apply leveling compound in certain spots. Concrete floors can t be sealed from the underside.

Lastly a layer of gravel is poured leveled and is covered by a vapor barrier and reinforcing grid readying it for the newly poured concrete floor. If your garage floor is sealed the water will eventually evaporate. To lower the floors to give an extra18 inches you would have to excavate a minimum of30 inches to allow for hardcore insulation concrete this will take you under the footings sugest you abandon this idea regardsterry. A dewatering channel often installed on the newly created bench ledge will also be installed to help capture any seepage that may come through the original foundation.

If you pour a quarter cup of water on your garage floor it should disappear in about half a minute. That s why there should be a moisture barrier between the soil and the floor. Install dowel rods 3 4 oc and leave the top of the concrete rough. One thing to consider is drainage if you lower the floor would this increase the risk of flooding or is there suitable drainage measures in place.