It's perfectly possible to install a commercially available gutter at the bottom of the terrace, whether it's a PVC or zinc gutter; commercially available or made to measure. The end of the profile should protrude 4-5 cm inside the gutter.

Watertight profile for recover rainwater

Rainwater can also be collected by installing a made-to-measure gutter, a UPN-type joist, etc. The gutter can also be placed in the centre of the terrace, by positioning the profiles with a double slope towards the gutter. At the bottom, the Metadeck profile rests on the supporting beam or end joist. To minimise the risk of water seeping back in, we recommend inserting a glazing-type EPDM seal between the beam and the profiles.