Water running off the roof of your shed will generally drain into the ground without any ill effect. However, where the sub-base is concrete or slabs and is larger than the footprint of the shed, it is recommended that you invest in guttering. Guttering stops the water splashing up from the ground onto the bottom of your shed, which would over time cause rot.
Guttering is also useful for the collection of rainwater to water the garden. If you install guttering to run down one or both sides of your shed, you just need a hopper and down pipe to allow the rainwater to be directed away from the shed base and into a water butt. You are protecting your shed and creating a green way to water the garden in one go!
The runoff at the bottom of the down pipe must be pointing away from the shed, preferably on to soil or stone, so that it soaks away. Remember wood only rots when the moisture content is above 20%, so the objective is to let it dry out quickly.
As well as directing water away, do not allow a build-up of soil or vegetation around the base of the shed. If the down pipe feeds into a water butt, you will be surprised how quickly this fills up. Unless using it frequently it will overflow, so make sure the overflow is not blocked and is also draining away from the base of the shed.
Water butts come in all shapes and sizes, but a standard domestic water butt would be 230 litre (51 gallons.) 1 inch of rain is 7.5 gallons of water, so a 7×5 shed roof would generate 315 gallons of water. In an English climate your water tank will be full during most of the winter.
At The Posh Shed Company, we understand the importance of guttering on a Garden Shed.
As such, we offer guttering and a water butt as an optional accessory on our product pages. Also, if you choose an Unbelievably Posh Shed, then this is included.
Please see individual product pages for more information.