Hi, I would test the Garden/sheds humidity for a time and see what it gets too, normally anything around 50% would be good and you could push it to 60%. Are you planning on finish them with paint or wallpaper?
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local