€19000  inc vat   HIGH SPEC  A RATED  HOME OFFICE   4 METRE X 2.7M x 3m height

SPECIFICATION

WALLS

from outside to inside:

Spruce cladding vertical t&g

timber battens vertical for cavity air space.

breather membrane to outside of timber frame

diffusion open green board outside face of external walls

90 mm rockwool slab (2 layers) in wall

timber studs  175x44

Red deal panelling to walls

OR skim plasterfinish to all plasterboard walls

Wall  u value
0.20W/m sq K
Alternative of
 Composite cladding will increase cladding cost by 65% verses Spruce timber panelling.
€820 extra for Dura  flush resist composite cladding.

alternative of polyurathane insulation will bring u value to 0.15W/m sqK

We prefer to use inert none chemical insulation products to avoid "off-gassing."

ROOF

from outside to inside:

Trocal heat welded membrane  roof finish

Osb deck   18mm  on top of rafter/joists  

50x50 batten space with ventilation

Rafters 225mm

Earth wool   200mm thick

Intello membrane to ceiling

service cavity on inside of taped intello.

Red deal panelling to ceilings

Roof u value
0.18W/m sq K

The entrance door wall can be moved outwards if more space required and less deck area

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