Although our builder already tapes the windows externally, we wanted to better insulate/seal them internally so after some discussions with both our chippy and site supervisor we basically agreed I wouldn't use any expanding foam!

So we came up with standard wall insulation and closed cell foam 'backing rod' in front to better air seal the frames to the window reveals. It's not perfect by any means but it will still reduce air flow around the windows a bit more. It only took an hour or two to cover all the windows and doors.
This is the basic process we used. I know of others who have used expanding foam and also silicon and this is probably a better seal but it also would cause our chippy issues when they make tweaks before putting in the architraves.
This pic shows how we did it, so pretty straightforward!:
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Here is a 'before' photo showing the standard 10-30mm gaps between the reveal<>frame:
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This is a window after we sealed it with the insulation batts and foam backing rod:
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Next we attacked the air return for the central heater. This is supposedly a common weak point in the average house in terms of energy efficiency. I guess we just want to reduce air being sucked in from the roof or other unconditioned rooms.
So we sealed up the frame joins with silicon, but we still have to fill in the top plate holes the sparkies drilled for cables. We are probably going to just use silicon in these holes but want to check with the builder first:
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Next pic is the bottom plate area of the air return:
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Next stop was the garage and sealed the bottom plates internally and also taped the wall wrap that was internal wall adjoining the house entry area. We also sealed up the joins in the yellow tongue we got installed along the back garage wall:
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Yesterday we also finally completed lagging the hot water pipes. We have quite long runs to both bathrooms unfortunately, so I really wanted to ensure we don't lose too much heat in transit: (have since added cable ties as insurance against the tape letting go!)
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I think we used a total of 56 meters of 1/2 inch pipe insulation @$2.50 per meter roughly. Plus two rolls of insulation tape and a bag of cable ties.