The underfloor insulation boards were fitted & channels cut to lay the 2.5 mm² cable for floor mounted sockets. The cables were laid & the floorboards & floor mounted sockets fitted.
A 1.5 mm² cable for the lighting circuit was fitted into the corners & through the central purlin so that the cable was hidden wherever possible. The supply for the light circuit came up in the rear RH corner of the cabin, & most of this would be covered by the ‘Billy’ bookcases installed later. A plywood ‘conduit’ was constructed for this corner between the bookcase top & the ceiling to hide the cable as much as possible.
The insulation boards were cut to fit between the purlins & directly under the roof boards. Where the boards met the vertical walls, & the centre purlin, the edges were cut at 16° to ensure as close a fit as possible.
The boards were then fixed to the roof boards with a contact adhesive, and ceiling boards cut from 5.5 mm plywood were screwed through the insulation boards into the roof boards using 70 x ø5 screws. The holes in the plywood were pre-drilled & countersunk so that the screw heads would not protrude below the ceiling level. The ceiling boards were fixed on all the edges, with some fixings in the centre of the boards. Although the plywood was buckled on delivery, the screws pulled it against the insulation boards & resulted in a relatively flat surface. The screw heads were filled with decorators caulk to hide the screws as much as possible. Fitting the larger ceiling boards required two people.
Robus ‘Acorn’ track lights were then screwed to the central purlin after cutting them to the correct length.
The ceiling was then finished with emulsion paint, & the interior walls were treated with wood preservative.
Finishing the Home Office
Several ‘Billy’ bookcases were fitted, and insulation was fixed to all the areas with adhesive, back & ends, which abutted the cabin walls.
As the cabin walls would shrink when drying out; special brackets were made to fix the tops of the cabinets to the cabin walls. These were made from 44 mm fence panel clips drilled ø6 mm on the legs; 50 mm x ø6 bolts & nuts; and a bracket made from aluminium strip bent in a ‘Z’ shape drilled on one leg for screws to fix to the cabinet top; and on the other leg drilled to a clearance fit for the ø6 mm bolt. The aluminium bracket was screwed to the top of the cabinets. The bolt passed through the top leg of the fence bracket which was screwed to the cabin wall, through the aluminium bracket, & finally through the bottom leg of the fence bracket & nutted up.
This allowed the wall, with the fence bracket, bolt & nut, to move down through the hole in the aluminium bracket, without crushing the cabinet.
Finally, panels made from 5.5 mm plywood were cut to hide the edges of any visible insulation.
Finished Log Cabin
Here are photos of the finished product, which is used as a home office & summerhouse. Carpet tiles were used on the floor.
A recent addition has been the fitment of a gutter, downpipe & rainwater butt. ‘FloPlast’ 76 mm products were chosen in brown, which seems to blend in well with the walls & roof shingles. Timber wedges had to be made to fix to the angled facia boards to provide a vertical surface for the gutter brackets.