Insulated Wooden Doorframe

Description
Every structure that has ever fallen to an enemy has been breached somewhere. And the breach point, more often than not, is the door. A door is only as strong as the place where it is anchored and many a would-be warlord has come to grief when their solidly constructed door was torn off at the anchor point. The difference between a king and a pauper might just be the entrance to his kingdom. Built of planks coated in resin for insulation, reinforced by wooden slats that have been shaped to fit, this will provide a safe haven from the weather and strong front to any foes who come knocking.

Repair
Repairing  requires up to:
 * 3
 * 3