Lister Housing Co-operative, Lauriston Place, Edinburgh
BCA Insulation Changeworks Lister Housing Co-operative Project
BCA Insulation were approached by Lister Housing Co-operative to survey garden flats with solid floors in Lauriston Place, Edinburgh with a view to proposing a system of floor insulation that could be installed without great disruption to the tenants or the existing form of construction.
The project is in a conservation area where any changes to the structure have to be considered.On carrying out the survey they noted several reasons why the proposed system would have to be as slim as possible. These were:
1. The fitted kitchen contained base units with work tops at a standard working height and any great increase in the floor could affect this.
2. Similarly, the bathroom sanitary ware was fitted and boxed in again making the option of removing and later refitting the items unattractive.
3. The gap between the radiators and the existing floor was reasonably small and would not take much of a rise before they needed lifting.
4. There were fitted gas appliances in decorative fire places with hearths that didn’t have much scope for movement.
5. Doorway heights were not generous and could not be reduced any more than necessary.
6. Lister Housing Co-operative wished to minimise damage to old 6-panel doors in this B Listed flat.
Taking all of the above into consideration BCA offered two options. Both options were able to carry domestic loading without the need for timber battening, which would introduce thermal bridging and increase the labour content. For both options BCA calculated the insulation values using new build thermal efficiency standards as a target. The systems were a chipboard and urethane composite total thickness 73mm (delivering a U-Value of 0.22W/m2K), and a MDF and Spacetherm composite total thickness 30mm (delivering a U-Value of 0.25W/m2K).
Through a Value Engineering exercise BCA demonstrated that although the urethane system was cheaper to lay, the knock-on cost was considerable as the increase in floor level would result in the skirtings being replaced, sanitary ware and kitchen units being removed and lifted and the gas fires being removed and refitted involving CORGI engineers. It would also reduce the door opening by almost two inches more than the Spacetherm option.
The client eventually chose the Spacetherm option on the balance of benefits, which included savings from being able to retain the existing skirting (as enough of it remained visible with the thinner Spacethermoption). A further benefit was being able to cut the existing door down to size rather than replace it (which would have been necessary with the urethane option as the amount to be cut would have encroached on the mortice and tenon connection that holds the door together).
The works were programmed in immediately after the injection of a new damp proof course, where BCA were involved in patching the floor screed where it had been removed as part of the damp proofing work. They also lifted and later relaid laminate flooring.
The works were carried out in one or two rooms at a time allowing the householders to continue living in the flat during the work.
The system dealt with the slight undulations in floor level with only small areas of self levelling screed needing to be applied by BCA. On completion both the householders and client were delighted with the finish and immediate improvement in comfort levels.
The energy efficiency improvements are being carried out as part of the Energy Heritage project co-ordinated by Changeworks and are being carried out with the involvement and sponsorship of the following; EAGA Partnership Charitable Trust, Edinburgh World Heritage, Communities Scotland, Lister Housing Co-op and Scottish Power.