Flexi-Flange isn’t one of the more popular products that Grate Products has produced, but it could be considered one of the most important.
The Flexi-Flange is designed to create the seal at the point where our Wall Protection Vapor Barrier meets the concrete of your basement floor. Its primary function is to close off access to the basement from under your basement slab and from behind our vapor barrier. At this point it also performs a few other key functions.
It protects the vapor barrier. The flange does this by lying on top of the vapor barrier. This makes sure that any of the concrete used to seal back the floor doesn’t interfere with the vapor barrier and keeps any separation from happening at the floor and wall joint.
The flexi-flange also allows the vapor barrier to continuously connect with the drain under the floor by allowing minor movements without breaking the seal with the concrete. This ensures continuous flow from the vapor barrier to the drain and stop point if water tries to jump the circuit.
For that homeowner with older, open back systems, the flange is designed to be reversible. This way we can retrofit most open back systems with wall protection and to seal off the open back system to provide true basement moisture protection. Without a vapor barrier and with an open channel in your drainage system you open yourself up to a list of hazards that many companies won’t speak about: added moisture and humidity, radon, bugs, and air from under your basement floor.
Considering that you had an open back system installed in the first place means that you were trying to have your basement waterproofed the right way. So this flange is designed to complete the design that wasn’t installed. Vapor barrier to protect your walls can be installed and your flange will close off the gap, easily sealing off the channel and allowing the vapor barrier to drain to the system without air, water, or other nasty things to jump the system back into your basement.
By creating the seal of the vapor barrier and drain the flexi flange becomes one of the most important sealed system aspects of any Grate Drain system. It’s a little known innovation by Grate Products, however it helps to maintain the system by simply existing. With no maintenance it’s a part that many homeowners forget about, however without it your vapor barrier might become damaged more easily, water might be able to jump the system and air would be able to flow up into your basement from under your floor.