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Might be a silly question but, how do you fill an existing cavity wall with a lean concrete below DPC? I'm planning to replace suspended timber floor with solid concrete so need to fill in the existing cavity.

Can PIR boards be used as EWI for an existing brick wall and thin coat rendered? Or EPS/Rockwool are my only options? (K5 Kingspan is too expensive)

Hi, I'm looking to replace my roof completely so will do loft conversion at the same time and I want to add PIR or phenolic insulation over rafters and I'm wondering if I can also add mineral wool in between the rafters to make it even warmer and increase sound insulation. My only concern is if...