1. Interlocking Water Channels
Magnolia's deep interlocking water channels make the system stronger and are able to handle more water flow than the competition.

2. No Unsightly Screw Placement
The stronger, longer flat channel system of Magnolia's system allows for a watertight, drip less environment without unsightly screw placement in your new ceiling.

We designed the box so that it could be installed on the back side of the gutter, so that the outlet would be at right angles to the gutter, or the box could extend the gutter through the trim boards in the same direction.

The overflow function developed from considering problems that appeared when people attached their downspout to underground drains. These drains are often in place to carry the runoff from the gutters that service the roof. Occasionally, these drains stop up, as any drain might eventually. Sometimes the drains were installed without considering the volume of water they would have to handle, especially in a downpour.

In either case, if the downspouts didn’t leak at their joints, the water would back up to the gutters at the roof and these would overflow. If the drain were only partially stopped, this might be evident in only the heaviest downpours.

However with the addition of an underdeck drainage system the water would reach the gutter on the underdeck, fill it and proceed to fill the panels of the underdeck, creating trouble.

We needed a way for the excess water to be diverted away from the downspout in the event it became clogged.

We calculated an area equal to the downspout opening and dammed the screenbox so that any water beyond the capacity of the downspout would flow over the dam and be spilled through a hinged flap on the end of the screen box.

All these features are important enough to the performance and appearance of the Magnolia Underdeck that we now include the Screen / Overflow box in every kit, regardless of whether or not a screen is planned. We recommend its use on every installation.     Click To Find Out More...