Retrofit of 1968 cavity wall house, F-rated EPC, to near as possible passivhaus standards, insulation and airtightness measures, triple glazing utilising south facing solar gain, MVHR, ASHP and underfloor heating. Watch this space!
Progress to date
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Upstairs nearly completed.
Still to do: cladding on the cheeks of the dormer, fascia and guttering, upstairs windowsills, patio, flooring downstairs.
Now that the upstairs we liveable, it was time to start on the downstairs. First we had to remove the remaining screed from the back of the house. Then lay insulation. We put 125mm of insulation in the front rooms to bring it to roughly the same height as the back. Next we had to put down a later of polythene and a foam expansion strip around the outside to allow for the screed to expand when heated by the underfloor pipes. Then we lay the 16mm Thermrite (pex-al-pex) underfloor heating pipes and clipped down onto the insulation. We had 7 zones in total. The one big mistake we made was not too pressurise the system. We were told we only needed to fill the pipes with water. This is not correct, its important to pressurise the system up to about 6 bar and then let it drop and sit at 1.5 bar, otherwise the screed will crack. Because we didn't do this we had to cancel the screed delivery and go back into the queue. It meant that we had to move out for a month as we couldn't live in
You can see why they say that plastering is the glory trade. The walls look so clean and fresh after the skim has gone on. It does create a huge amount of dust and dirt though! Highly recommend Adam Russell and his dad Nigel. They have experience of ensuring airtightness too.
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