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Would a kers vent help?

Ie not sure about u value of the cavity wall wool type injected insulation, its brick built external and internally with 100mm cavity, plastered to inside and cement rendered to outside (intending having k rendered in the future). Aware could change dew point so need advice on applying internal...

Obviously time and costs are an issue, its a diy approach, working on the principal of anything better than nothing. I've looked at u values but find them confusing

Not really sure about target u values, guess I just want to improve the house one room at time, the sloping ceilings have no insulation at all so will do those in future. There's other issues too like bay windows no insulation above, front dormer suspect none to roof, front door 1930s type...

The maim question is should I also put insulated plasterboard on the inside of the external wall, if so what thickness, the cavity is 100mm with injected wool type. I realise the generated moisture is an issue so considering new windows with trickle vents / using dehumidifier too. Draughts...

The cavity wall insulation was done years ago and has caused no problems.

Hi everyone, I have a 1930s chalet bungalow,. Cold drafty house, with issues. Expensive to heat! Insulation: 1. it has cavity injected insulation. 2. Loft insulation ordinary type 100mm under loft boards and 400mm on none boarded areas, I realise I could put pir under boarded section to...