Ask your questions regarding the exterior of your house - siding, roofing, etc.
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As a general practice, should the top of my foundation membrane be sealed at the top against the foundation? As you can see from the picture, i have a burried downspout extension nearly at level with the top of the membrane and is a vulnerable spot for water intrusion. What should be done as a preventative measure?
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Depends on the product used. Dimpled products allow a gap for easy drainage to the drain tile at the footing but membrane types keep moisture off the concrete completely. I really can't tell for sure what you have?