Injection question

I have seen many foundation wall injection fixes that start leaking within 2-3 years after the fix. Common factors:

  • Owners say the urethane was injected by hand pump, rather than machine.
  • One such fix, the ‘contractor’ just drilled holes into the crack, stuck in a 7-11 straw (sealed with fast drying epoxy) and used a can of Great Stuff.
  • Many developers in new construction are using the cheapest people to do the fix.
  • a lot of the yellow-brown urethane foam is seen coming out of the crack.
    Any comments? Have you seen this?


no, but the expanding foam can put excess pressure on materials and cause more problems.

 -this is from a company who has done Injections

 paragraphs 3 & 4

 "Injecting sealant materials into wall cracks was a big breakthrough at the time.Yet, we have had to watch as continued structural movement & further concrete shrinkage have re-opened cracks to leak.Injection alone cannot provide a lasting solution as cracks get larger and soil expansion & contraction cause the foundation to shift & settle".

 Injections from inside do not help lessen/relieve lateral `n hydrostatic soil pressure and tree roots which are against the outside of basement walls which cause many walls to crack,leak,bow etc. This is often why injections do not last.

 The Crack Team announces its affiliate membership with ASHI

I do not like this you can not stop a leak from the inside permanently .
You must get at it from from the outside . A better drainage from the outside is necessary.
They must know water is the strongest solvent there is and when it starts to leak again they are just
leading the water away and it will continue to erode the wall.
I have seen various types of inside draining systems and I am not impressed .
Roy sr


Wall collapses during basement repair job

A silicone injection companyin my area offers a transferable ten year warranty against any leaks or they will return to repair the leak at no charge.

I own a waterproofing company in Ann Arbor Michigan. We have injected thousands of leaking cracks with sucess. We use high pressure injected poly-urethane. The PU is injected at up to 3000 psi from the inside. This forces the grouting material through the crack and into the soil where it gels in the dirt, helping stabilize the void left in the soil from erosion.

We use this method on non-moving cracks or typical dry shrinkage cracks. Epoxy injection is different.

Epoxy bonds the two halfs of the wall back togeather for a structural repair. It is only medium effictive in stopping water. We use epoxy only when a crack needs structural repair (we also have other methods such as carbon kevlar stiching).

The most common repair is low pressure injection. This only works in a very wide crack. If you see a plastic injection port, low pressure injection was used. Our ports are steel or brass. Each injection port has to be drilled into the crack or intersecting it. On the outside of the crack paste is sometimes applied to help develop greater pressure, forcing the PU deeper into the crack and keep the PU from escaping.

You can see photos of a crack repair at our web site

Vendors that are Not Home Inspectors and have never performed a Home Inspection can advertise an ASHI Affiliation but ASHI Candidates Paying Dues to the ASHI Organization Can Not even suggest/advertise an affiliation?