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hi all. had a corgi guy out to our sime super 90 plus combi boiler. problem was/is that system holds 1 bar fine until running where it climbs to 3 bar and once cooled shows .25 of a bar. the engineer recharged the expansion vessel and didnt find water. system ran fine whilst he was...

hello im new and have tried looking through threads but cant find my answer. i am boarding over uneven floorboards upstairs in a 1955 house. im using 9mm wpb. do i need to worry about ventilation.. as its going to be pretty air tight once its done? many thanks pat