We extended this house for Gerard Menezes in Glasnevin, Dublin in 2008 from 80m2 to 150m2 and did some renovation work to the existing house. The 70m2 Timber Frame Passive standard Extension arrived to site from our factory fully finished and insulated with the plasterboard on the walls and the windows fitted. It has excellent U-values of 0.11 for the roof, walls and floor so we expected a really good performance from this extension but the performance far exceeded our expectations.
All the Cold bridges were eliminated using our “Passive Slab” foundation system, we got an EnerPhit Air-tightness result of 0.95ACH@50kPa for the complete house which shows that taping the joints in the OSB board works really well. The main air losses from the Timber Frame Passive Extension were through the Rationel windows which leaked at the seals. We pumped 400mm of Cellulose into the roof of the existing house and did air-tightness work around the windows and ceiling.
The existing house was Externally insulated with 120mm of plastered EPS and Heat Recovery Ventilation was fitted. We ran this house through the Passive House Planning Package Software and got an amazing result of 23kwh/m2.a which meets EnerPHit standards, making it Ireland’s first.
This house was featured in a Construct Ireland article and has a BER cert giving it a B2 (90kw/m2.a) showing the inaccuracies of the BER system "This extension follows our ethos which is to reduce the need for heat to a level which makes the heating system irrelevant".
This is the wall build-up we used for the Timber Frame Passive Extension.
Passive Slab is Passive House certified to deliver the lowest U-value (as low as 0.08W/m.K) on the market and eliminates the critical wall-floor Cold Bridge. Read More
Cellulose insulation is made from recycled wood fibre, primarily newspaper. One hundred kilos of cellulose insulation contains 80 to 85 kilos of recycled newsprint. Waste disposal is a major problem for cities. Cellulose unquestionably meets all requirements for insulation specified by the guideline. Read More
Our Timber frame Passive Houses usually arrive on site pre-finished with Cellulose Insulation in the walls and triple glazed Passive House windows fitted. The Timber frame walls can be pre-finished internally, so no wet trades are required on site.Read More
Passive Houses are highly insulated, comfortable, cold bridge free structures that require little heating, they usually have triple glazed windows, heat recovery ventilation (HRV) and high air-tightness levels. It doesn’t cost extra to build a Passive House using our construction methods, as money saved on a complex heating system pays for better windows or extra insulation. Read More