Hardwood decking is made from a number of different broadleaved trees. These could be oak, ash or beech. The wood of these trees is slower in growth and this tends to offer a “harder” and more durable timber.
Establishing a regular habit of deck maintenance will ensure that you enjoy the maximum life from your timber deck. For decking, the requirement for maintenance is minimal, but none the less very important.
Although these can't be seen when your deck is complete, they are perhaps more important than your deck boards. Deck joists give you the framework to attach your timber decking boards to and play a very important part in ascertaining the strength and durability of your decking.
Bat roosts and shelters are closely protected by conservation legislation. You must consult the Statutory Nature Conservation Organisation for your area (Natural England, the Countryside Council for Wales, Scottish Natural Heritage) before doing anything.