Saturday, October 15, 2011

Week 4 Foundation Systems Pre-Lecture Resources

This week we are going to have a look at the different foundation systems on offer for a passive house approach. Interestingly, the recent revision of the Part L 2011 for residential buildings has reduced the elemental u-values for ground floors as outlined in Table1.

Table 1 Maximum elemental U-value (taken from Technical Guidance Document Part L 2011)

Where the source of space heating is underfloor heating, then a U-value of 0.15W/m2K should be satisfactory (Section from Part L 2011). From a thermal bridge viewpoint, Part L recommends referring to the Acceptable Construction Details and the guidance on limiting thermal bridging and air infiltration provided by the Department of the Environment, Community and Local Government. A number of companies have developed some innovative solutions to providing a foundation with little or no thermal bridging, good air-tightness and good overall energy performance. Viking House and KORE have developed the passive slab which can deliver a U-value of 0.08W/m2K. Passive House Builders have developed their own solution (click into foundation to see detail) which has been successfully used on certified passive houses both in Athenry and Oranmore in County Galway. Aeroboard also provide the Supergrund system for passive house construction.

We will have a look at these systems as well as a few others on offer this week in class.