oh dear what have i started 
The air brick is louvered and isnt on a weather wall (gable end near apex of roof) and I checked initially, to see if their was any rainwater ingress which thankfully there isnt. The house is a northern counties HA 10yr old semi. So, presumably it should be compliant. "but then again!" ( se my new post wolf combi boilers) Ive already decided to send it through the wall, stick birds nest cap on and mortar up the gaps as I wanna convert the loft into office space. Problem is if I put an aav on there may be a problem with the basin and bath traps as the waste goes underneath the floor and must be bossed into the stack below the wc "T".
The air brick is louvered and isnt on a weather wall (gable end near apex of roof) and I checked initially, to see if their was any rainwater ingress which thankfully there isnt. The house is a northern counties HA 10yr old semi. So, presumably it should be compliant. "but then again!" ( se my new post wolf combi boilers) Ive already decided to send it through the wall, stick birds nest cap on and mortar up the gaps as I wanna convert the loft into office space. Problem is if I put an aav on there may be a problem with the basin and bath traps as the waste goes underneath the floor and must be bossed into the stack below the wc "T".
