Work is well under way to a cottage renovation, with blockwork having commenced last week following two weeks of demolition work. In the first in series of blog posts on the project, I will outline the choice of wall insulation.
With existing external walls of stone/rubble construction, it was decided to insulate the entire building externally, using weber's external wall insulation system. As a designer the choice of external insulation, was greatly influenced by the fact that the entire external face of the wall is insulated to the same thickness, with no thermal bridges, where cavities are closed or new and old work is bonded together. The proposal is to use the weber.therm XM external wall insulation system which is Agrément Certified with a mineral fibre insulation to the existing stone/rubble walls and EPS to new conc blockwork. A series of articles in Construct Ireland Magazine entitled "Breaking the mould" which dealt with upgrading of single leaf external wall construction, further helped with the choice of insulation method.
All new work is constructed of solid blockwork, with the customary cavity eliminated. The dwelling does however comprise of a partly build extension of insulated cavity construction, which will also be insulated externally. In this element of the construction the entire cavity is been fully closed so there will be little or no air movement in the cavity.
The insulation will be carried down as far a practical below ground externally and right up to wall plate level at eaves. All existing windows and doors are to begining replaced and are brought forward in line with the external face of the external structure, further reducing cold bridges.
It is expected that the installion with be complete within the next 4-5 weeks, however beforehand the requirements from all service pipe supports etc has to be assessed and provisions made for.
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