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I am almost done with filling in all the gaps the builders left before I get my second airtightness test. One job I have been putting off doing, but want to do is the inside of the chimney breast. The idiots put the large coat on the outside of the chimney breast, and did not parge inside it before putting the fire in, despite being asked to a couple of times. It is obviously draughty in there. I cannot figure out exactly where the draught comes from, it might be a number of places. Inspecting it, there is around a 10mm gap at the top under the slab, so that may be allowing air in from the cavity. There are also vertical gaps between the blocks as Porotherm does not have mortar in the vertical joints and various gaps in the corners where it meets the outside wall. There are door frames behind these gaps so they may also be a source of air leakage. I have tried foaming up the largest holes, but having looked at it I cannot foam up all the vertical joints. It is also difficult and messy as I am working through a roughly 400x600 hole at the side and some areas are around 2m away from where I have to work. So I was thinking of using a long brush to try and parge the walls. The area is only around 4-5 square metres so I don't mind about the cost/m of what I use. Just something easy to mix up and that won't drip and run al over the place. It also needs to be able to fill in gaps around 10mm wide. I was thinking of buying this. https://www.amazon.co.uk/Bostik-30812571-Cementone-Render-Repair/dp/B01D8FRGMI/ref=sr_1_1_sspa?keywords=plaster+render&qid=1636887565&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyQko4Q1hRWlU1NFBHJmVuY3J5cHRlZElkPUEwOTQxOTU0WkFYUVJaWFMyUE9IJmVuY3J5cHRlZEFkSWQ9QTA4ODEyNDgzMjFWNEw1U0ZDT1lUJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ== Any thoughts?

I need to crack on with our rendering / parging / slurrying. But it looks like there'll be a bit of a nip in the air soon. I have organised a cover for the parged / rendered / slurried area (well, I get moaned at if I get the term wrong ) Should I simply avoid the process in the very cold weather? Or is there some witches potion that we can add to the mortar mix?