We have just delivered a Dorset downland hut to Somerset, and we are often asked to explain the difference between the two models we offer.  The Downland  is intended to be of a specification familiar to a Victorian shepherd.  However both versions have the same insulated roof with breather membrane and vapour barrier under the roof sheets.  The downland has an exposed timber frame on the inside, with a pine floor and no cavity under the floor.    I personally would prefer to take the hut beyond this stage to the much more refined Plankbridge hut.  This version has a cavity all round (floor, roof and walls) and benefits from the breather membrane and vapour barrier on all the walls and under the oak floor.  The main advantage is that the hut becomes a similar environment to a modern timber frame structure, meaning papers and books can be left inside without becoming damp.  The insulated cavity helps soundproof the interior, making it a relaxing place to be whatever the weather. 

During the snow I lit the stove in our Plankbridge hut early in the morning and it swiftly got to 21 degrees centigrade  inside the hut.  I kept the burner ticking over, maintaining the warmth inside and there was still 2" of snow on the roof at 3 in the afternoon.  A fully insulated hut has got to be a good thing!