ZEMCH 2015 - International Conference Proceedings | Page 285

These houses are located in Northern Ireland, and require a number of interventions for improving their energy performance with minimal disruption through cost oriented solutions. The retrofit work will be carried out in 4 different phases to enable analysis, learning and improvement
between phases: Phase 1-A (House 6), Phase 1-B (houses 44 e 45), Phase 2 (houses 46 e 47), Phase 3
(houses 49 e 50), and Phase 4 (house 48), as illustrated in Figure 2.

Figure 2: Planned retrofit construction sequence
The retrofit work consists of:
• replacing the old external windows and doors made of wood and single glass by openings
made of PVC and double glass;
• strengthening of the existing loft insulation layer, and
• insulation of external walls using insulation dynamic boards and rendering;
This paper reports the use of 4D modelling in Phase 1A (House 6), which started on February 2015
and were completed by April 2015, and cycle 1, which corresponds to the period between the
completion of Phase 1A and the end of July 2015.

Development and Results
House 6 (Phase 1A)
Initially, a 3D model was developed for each house typology, based on existing plans (i.e. *.dwg
files) and site visits. In addition, new insulation elements were modelled and added to the initial
3D model for House 6 (i.e. insulation boards, first-base coat, fibre glass reinforcing mesh) according to the building technology defined as part of the overall S-IMPLER project. By having these
elements in 3D, the task of cross-referencing information from the 3D model and the schedule of
retrofit works prior to 4D simulation was facilitated. Synchro Pro® was used to simulate the construction phases. The inputs required for this simulation were the 3D model, construction schedule, list of equipment to be used, and location of inventory of materials. Some of this information
was based on the experience of practitioners involved in the project. The different trades were
organised into task groups and identified by colour coding in the 4D model, so that their tasks
were easily visualised in the simulation.

Using 4D bim in the retrofit process of social housing

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