Specifications
                 EXTERNAL

DIMENSIONS                
                                
                Length 16ft
                Width  8ft
                Height 8ft

BASE    
                    
                4" x 2" pressure treated timbers
  
WALLS
                 20mm tanalised loglap timber
                 Can also be stained.
                 100mm insulation all round.

DOORS/WINDOW

                Full height french doors,
                5ft 10" x 3ft 0"
                Double glazed glass units
                Secure 5 lever type locking

ROOF                       

                Rubberoid hexagonal shingles
                               INTERNAL

ENTERTAINMENT    

                15" LCD TV with freeview.

POWER SERVICES                   

                5 sockets inc 1 heater fused socket
                Fridge (approx 3.5 cu ft)
                Microwave cooker
                Double bunk reading light
                2 main cabin lights
                External porch light

WALLS                     

                Tongue & groove cladding, varnished

BUNKS                   

                One double & 2 single

HEATING                 

                Either fan heater or convection to customer spec.

SAFETY                    

                Residual circuit breaker
                Certified electrical checks
                All electrics run through conduit pipe.
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For U Value calcs, you can go to

 
http://www.vesma.com/tutorial/uvalue01/uvalue01.htm

Add the info for the walls.

External loglap (wood medium) 20mm
100 mm insulation (rockwool)
Internal cladding (wood soft) 12mm
U-VALUE                0.35                W/m2K
Total resistance     2.9                  m2K/W