Hi
I will be using periscope vents to air under a block and beam floor and wondered about the below ground cavity fill. All the regs say to fill the cavity to 225mm below DPC although this will partly encase the vents in said concrete; is that okay?
Also when I am at DPC the building inspector has requested two (yes two
) 1200 gas membranes be lapped over the cavity. I was going to run these membranes across block and beam floor, up 150mm or so and across the inner and outer DPC (level bridge). The logic of bridging the cavity and laying bricks on the gas membrane/DPC has got me!
Do I lay the gas DPM under the normal DPC and should i bed the gas membrane(s) on mortar like the DPC?
That would be like insane layers of bed/dpm/bed/dpm/bed/dpc/bed/brick - I'm sure i've got that wrong
If i bridge the cavity with the gas membranes level, how far up does the cavity tray sit; next brick up? Second to this, where am I going to start the wall ties with all this going on!
Any help appreciated!
I will be using periscope vents to air under a block and beam floor and wondered about the below ground cavity fill. All the regs say to fill the cavity to 225mm below DPC although this will partly encase the vents in said concrete; is that okay?
Also when I am at DPC the building inspector has requested two (yes two
) 1200 gas membranes be lapped over the cavity. I was going to run these membranes across block and beam floor, up 150mm or so and across the inner and outer DPC (level bridge). The logic of bridging the cavity and laying bricks on the gas membrane/DPC has got me! Do I lay the gas DPM under the normal DPC and should i bed the gas membrane(s) on mortar like the DPC?
That would be like insane layers of bed/dpm/bed/dpm/bed/dpc/bed/brick - I'm sure i've got that wrong
If i bridge the cavity with the gas membranes level, how far up does the cavity tray sit; next brick up? Second to this, where am I going to start the wall ties with all this going on!
Any help appreciated!
