Air vent position

[trevorbayliss]

I am building an extension and doing a timber suspended floor, so need to get air down to the void. I will be using 3 air vents on each side of the building.

Generally i notice on new builds the air vent sits above the damp course, but i was wondering if i can sit the vent just under the DPC. I need to use these telescopic vents and i will come up 5 courses if the external vent has to sit above the DPC. Or 4 courses if below it.

 

[John D v2.0]

The main thing is it's above ground level outside ideally 2 clear courses below it, and inside is venting into clear space underneath the floor insulation. Dpc doesn't matter as the brick is plastic usually.

 

[^woody^]

They should always sit below DPC.

 

[trevorbayliss]

It will be one course above ground level. So it will work out ok as the damp course will be above this air brick line.

I am using the telescopic bricks as i need to come up four courses.

Are these plastic sections ok taking the weight of blocks or bricks above them then ?