As expected, the main build team were back on site and focussed on laying the Marshalls GrassGuard blocks around the perimeter of the block paved area – and tidying up, in preparation for exiting the site. The overflowing skip was removed.

The self-levelling floor screed laid in the Utility Room on Monday had caused some condensation on the windows and doors so I turned on the newly-completed ventilation system and started to take some airflow measurements with a view to properly commissioning that in a few days. Without any of the Extract and Supply valves fitted, the Supply vents were moving significantly more air than the Extract vents – which was surprising because they have longer duct runs. It looks like the fan speed will need increasing on the Extract side (and / or reducing on the Supply side) – since the flow volumes want to be balanced to reduce the tendency to vent air through the building fabric.

The heat pump / air conditioning installation isn’t finished yet and running the ventilation – even though it incorporates Heat Recovery – is tending to cool the building, so there’s a small oil-filled radiator helping to maintain the temperature in the Utility Room to aid the floor laying tomorrow.

The main progress today was the preparation of the concrete floor in the Utility Room and Shower Room, ready for their commercial-grade vinyl flooring which will get a mop-friendly ‘coved’ skirting as might be seen in a healthcare setting. The concrete floor was mechanically scrubbed to remove any mineral deposits, then primed, then covered with a self-levelling screed to ensure that the wet-room shower drains properly.

The garage door installation team made a brief visit to re-attach one of the spring tension cables that had come loose from one of the doors.

I was half expecting the block paving team to be back to finish things up but it seems they had another job booked starting today. The actual block paving is down but there are some gaps between the blocks that need filling with grit (rather than sand, with it being permeable paving) – and then the boundary ring of Marshalls GrassGuard blocks need installing to help keep the main body of the blocks in place (the GrassGuard is twice as deep) and to provide a bit of extra turning space.