I have a partial basement that is only accessible from the outside and we use it for storage. The back of the basement is against a portion of the front of the house (see photo). Whoever built this this house didn’t slope the land correctly. When it rains hard OR for an extended period of time water gets into that portion of the basement. Also, the gutter above doesn’t appear to be able to handle any larger amount of rainfall.

My buddy (who owns excavators and dump trucks) is going to bring his crew and small excavator to work on this. We are going to put another downspout in the corner (4") and tie it into the existing drain. Also he mentioned digging out the dirt, power washing the foundation and then sealing it with black liquid rubber coat and then back filling the grade so it slopes away from foundation.

Another friend mentioned using rubber sheet but I'm not certain what exactly he is referring to. I was thinking about mentioning this to my buddy with the equipment as well and putting it down as an extra layer of waterproofing. Does anyone have a link to this type of rubber sheet? OR, would the liquid rubber coat be enough?

Would like to get everyone's thoughts on this approach?

 

Don't forget the weeping drain system at the base of the foundation walls. That is the key to getting water away from your basement.

If you search online for "basement waterproofing membrane" you will find many options.

 

@pilot dane Thanks for that information. Hard to see by that photo but there is a nice slope there. Just wondering if I want to go through the added expense of a weeping drain. The main issue is that when they built the house the there was no backfilling away from the foundation. In fact, in that corner the dirt actually slopes a little toward the house.

 

Better to install the drain now while it's excavated then find out months later you should have.

 

Just wondering if I want to go through the added expense of a weeping drain.
Your house is not a boat hull and is NOT waterproof no matter what coatings or membranes you apply. If there is water accumulating around the basement the water will eventually find a way in. The weeping system's job is to carry the water away and keep the water table around the house below the level of the basement... so water can't get in. The waterproofing applied to the basement walls is there primarily to stop the water from moving horizontally so it can percolate down where the drainage system carries it away.