The rear wall

The tongue and groove timber for the rear wall was painted over 4 days - and fitting was fairly easy. 75mm x 50mm battens were screwed to the frame with stainless steel screws and 25mm x 25mm battens fixed inside each frame - insulation was stapled to the 25mm square battens and breather membrane secured on to the 75mm x 50mm battens. (See previous post Gable end and extension – 7 July 2013)

Internal rear wall of the shed and extension

It will be necessary to infill between the rafters and ceiling with short lengths of tongue and groove prior to fitting the oak feather edge.

I did not fit an internal wall to the end of the extension only covering the oak frame with breather membrane. I did fit an internal wall to the rear of the extension to maintain a line with the rear of the shed but this was not insulated.

With the membrane over the end of the extension the oak feather edge could be fixed.

Oak feather edge fitted to the end of the extension

Detail of front end 

I have now begun to paint the tongue and groove timber for the end walls and think about ordering the large glass panels for the front and end corners. The glass will be fitted to the face of the frame using softwood packing and air dried oak strips - EDM sealing tape has been ordered from Reddiseals