Is the dirt around a home supposed to stay below the tar line for water proofing?

1 Answer

Answer :

answer:Ideally the dirt should not be above that tar line primarily to prevent surface water from breaching over the foundation. But when the grading is sloping towards the house now you have a situation where surface water is directed toward the house where it will soak into the ground next the the house where seepage through foundation cracks or in severe situations in through the joint where the basement floor and wall meet will be a greater possibility. I was a waterproofer for 16 years and saw this condition at almost every home that had seepage issues. I do not see a problem with taking the grading up above the tar line if that will ensure a good slope for surface water to shed away from the house. You could always buy a can of liquid tar and extend the tar dampproofing up higher but in my professional opinion that is not necessary as there will be little to no hydrostatic pressure at the top of the foundation to where a coating is needed. Proper grading and extending the the downspouts are the 2 best improvements you could make towards having a dry basement. Fixing any cracks is next and if you have a sump pump make sure the pump is 5 years or newer and if the home has a battery backup you do not want old batteries as they need to be replaced every 4 years.

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