If you are fortunate enough to own a summer house, there are certain tasks that must be carried out in the spring, as the cold winter disappears and you look forward to a lovely long summer in your summer house. Like any structure, a summer house needs to be well-maintained and kept clean, and with that in mind, here are some useful tips to ensure that your summer house is ready for the coming summer.   Apply Timber Preservative – Your summer house should be constructed using seasoned timber, which does require some preservation, and prior to adding a couple of coats of varnish, you might want to apply…