Vent pipe

We were talking about the vent pipe that’s been installed in the rear of the roof and which sticks up rather obtrusively above the roof ridge line.

I have to confess that I didn’t know what it was for and thought that it was perhaps something to do with the ventilation system that is now hanging in the roof space waiting to be connected. But I realised I was wrong when I came across the following image.

So it appears that it will be used to connect the secondary, or extractor, vent of the house’s proposed ‘fosse septique’ (septic tank) waste water disposal system and one of the two smaller vents in the roof, the one below it, will be the primary inlet vent. According to the image the secondary vent has to stick up 40 cm above the roof line so although it’s a bit of an eyesore at least it’s nice to know that my house will conform to all of the latest regulations 😉