| House C: | A single-leaf wall house built between 1930 and 1950 |
| Distribution: | Very common in Dublin in Cabra, Drimnagh, Crumlin, Killester |
| Upgrade: | Drylining, warm & cold roof, full airtightness upgrade |
house c
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1) Amazingly these houses with cast concrete eaves and bituminous sarking felt were built without a roof ventilation system. As long as there was almost no insulation and loads of leaks it wasn’t a problem. Now as insulation increases, air leakage reduces and indoor air temperatures rise we need to install a roof ventilation system that will allow the roof timbers to ‘breath’ and ensure moisture (from outside and the rooms below) escapes. As a result we propose installing tile ventilators at high and low level. These are easily fitted. The small rectangles indicated on the roof plan are ‘G5’ Tile Ventilators at low level and ‘G3’ Tile Ventilators at high level near the central ridge. Both are available from Richmond Building Products who can be contacted, to confirm the number and location of these ventilators, and the exact shape of tile or slate on your house as these must integrate together.
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6) The installer or the homeowner him/herself can then loose-lay cellulose insulation in the attic to the height of the top of the counter battens. As the fibres are loose something needs to keep them down. We recommend using ~40-50mm of ‘Thermosafe WD’ from Ecological Building Systems or ‘Pavaboard’ from Econstruction tightly butt-jointed together throughout the attic for this purpose. Use OSB boards locally above them where light storage or decking is required. Note where heavy goods are being stored the OSB boards will need to be rigidly fixed down to grounds. Using wood fibre insulation boards like this has several advantages. Besides increasing the overall insulation levels and keeping down the fibres they maintain the vapour permeability and have a high thermal mass (which slows temperature movement through the insulation zone).