How to Build a Rainwater Catchment On a Shed Roof. It’s easy to attach gutters onto your shed roof to collect water for your vegetable garden.
We decided we were going to add a few rain barrels on the land to collect water for the garden. We are trying to be “off the grid” as much as possible for this adventure so it made sense to us to try to catch all the free water we could. For this, we built a shed in the garden and added gutters to it to collect water into the rain barrels.
In just a few days we collected a full 50 gallons of water into one barrel, so it was a big success! Now we hope that it rains every week so we can get a full 100 gallons to water our plants with. Here’s a rain barrel calculator if you want to see how much rain you can collect.
How to Build a Rainwater Collection System
Here’s how we did it:
First, we built a shed This is the 7×7 Rubbermaid Roughneck Gable Storage Shed that we got from Lowe’s to place into the the garden. It was easy to put together as you can see in our time-lapse video.
We bought cheap vinyl gutters and mounted them to our shed with gutter mounts. The most difficult part was the mounting of the gutter hangers. For this we used machine screws to install the gutter hangers on the shed by drilling through the shed wall and fastening the machine screws with washers and a nut.
We used a gutter end with a drop at the back of the shed to funnel the water down and then some flex spout to direct the water right into the rain barrels. The rain barrels are connected to each other in the back with a small hose that we cut. Once one barrel fills up, then the hose will transfer water to the 2nd barrel until they are both full.
Here you can see the shed with the gutters from the front:
Gutter on the right side:
Gutters from the back:
Gutter from the left:
Gutter going into the rain barrel:
Water success! We attached 2 screws into the gutter that go into the rain barrel, this holds it into place.
The back of the rain barrels are connected. When one gets filled, then the water transfers to the other one.
Once filled water, you can put the water into a watering can..
Or set up a generator/hose sprayer and water the garden.
Enjoy the water plants! This baby broccoli sure is.