One simple way to identify ‘moisture vapor drive’ is to lay a flat rubber mat on the floor and leave it there for a while … a few days or whatever. If you pull up the mat and find that the concrete is a darker under the mat then you’ve personally witnessed the moisture that weeps through concrete (moisture vapor drive). Moisture vapor drive is more powerful than you would believe. This moisture pushes paints off of the floor causing bubbling, peeling, delamination, etc… If carpet were laid directly over a floor that is not permanently sealed then mold is likely to grow.
The guy who quoted you is obviously not solving the problem directly; he will attempt to ‘mitigate’ the water. Sheet goods are used as an attempt to isolate the basement’s contents from the water/moisture.
I would like to take this opportunity to clarify another scare tactic that is too often used with regards to ‘wall buckling pressure’. Your basement has NEVER had any hydrostatic relief (from what you stated). The real question to ask yourself is “what is the most water anyone has ever witnessed in my basement”? If your basement has a few damp areas, a couple leaking cracks, and a few puddles on the floor then how much water entered your basement on that occasion? If the answer is approx 5-10 gallons of total water … then I have to ask, “what pressure”? Sani-Tred products will absolutely hold out 5-10 gallons of water … no problem and there’s no pressure to speak of.
What if your basemen typically floods 2 INCHES DEEP every time it rains. No problem … where’s this wall buckling, foundation collapsing, floor cracking pressure? Sani-Tred will hold out more than 2” of water without question.
OK, the flip-side to this coin is what if your basement FLOODS 5’ – 6’ deep every time it rains? The answer is, you’ve got worse problems than waterproofing. Yes, Sani-Tred products WILL permanently waterproof even this basement, but you must first get rid of all this standing water because your basement is sitting in the middle of a swamp. Yes, in this circumstance you ALWAYS HAVE had a massive amount of water pressure against this flooded foundation. No one in their right mind would say “I wouldn’t worry about all about this high water table”. Sani-Tred products will withstand much more negative hydrostatic pressure than can possibly occur in any basement … even if you picked your house up and dropped it into a lake (not exaggerating either).
If your question is … “would a typical, residential, Sani-Tred waterproofed foundation that has been submerged 8’ deep into a lake be fine forever … structurally”? The honest answer is and always has been NO. No one in their right mind would ever build a foundation in such an aquatic environment without first constructing the foundation to meet the specifications for such an environment … for obvious reasons.
“What happens to the water”? The honest answer is ‘where it always has just not in your basement’. Keep in mind just how much water were talking about too … remember that tiny amount of leakage you witness? You have more water flushing down the toilet than during the hardest rain. Now think about the question again “what happens to the water”? Here’s a good question, where does the water go that is pumped out of a sump? It gets pumped out of the home and simply goes right back to where it came from … the ground. Sealed or not you will have the same amount of water in the ground as you always have. Now some people have the luxury of living up on a big hill and the water can be pumped or drained far away from the home, but this is not the majority.
Water/moisture goes wherever it can. Water follows the path of least resistance. At the moment the least rout of resistance is where it is currently leaking into your basement. Once permanently sealed out, this water/moisture will never enter again. Your foundation will be sitting just as it always has for nearly 70 years and will likely continue to stand for another 70 … only bone dry.
Here’s a few more myths ~ water dissolves concrete ~ concrete needs to breath :) ~ the presence of water/moisture erodes concrete. The presence of water/moisture never hurt concrete. If concrete dissolved in the presence of water/moisture then foundations, bridges, highways, underwater tunnels, pilings, pier columns, and dams would never be made of concrete. Concrete does not need to breathe. If that was a fact then how is your foundation footing expected to breathe :) ? What does hurt concrete is water/moisture being allowed to perpetually travel completely through it. This DOES erode minerals out of the concrete. The depletion of these minerals DOES cause the concrete to loose integrity over a long period of time. You can actually see these minerals in the form of efflorescence. Efflorescence is water/moisture that traveled completely through the concrete, evaporates on the other side, and what is left is a mineral buildup (efflorescence). Efflorescence can also be comprised of some minerals that were originally in the ground water/moisture too.
Unfortunately the only way to stop 100% of all water, moisture, vapor, and problem radon from the exterior of the foundation is a 1 piece seamless liner under and around the home. This is not practical of course. Water mitigation may stop a flood by pumping water, but can never guarantee to stop moisture vapor drive. Exterior coatings obviously do not solve any floor problem and will never stop water from coming through where the wall meets the floor. Sheet materials unfortunately do not solve the problem as they will have seams and doesn’t stop the water/moisture. Dehumidifiers only pull moisture out of the air (which is water that has already evaporated). One thing that is a fact is that all of the above is ‘water mitigation’.
Once Sani-Tred has been applied it can never bubble, chip, peel, crack, delaminate, or leak for the life of the structure. This link will explain why: http://www.sanitred.com/waterproofing-products-qualities.htm Once applied, the 1st coat of PermaFlex saturates into the concrete then cures to become as tough as a truck tire. All Sani-Tred products molecularly weld to each other. Now you seal any joints, seams, cracks, and holes using LRB/TAV mixture (Liquid Rubber Base, Thickening Activator). This mixture has 600% elongation and will molecularly weld to the prime coat that is embedded inside the concrete. To finish things off you apply 1 coat of PermaFlex. This coat will molecularly weld to all previous applications to create a 100% seamless, 100% waterproof basement, and all of the materials have 600% elongation. It is impossible to remove these materials without removing the surface of the concrete with it. This is not paint and certainly not temporary or superficial in any way.