Hi
I'm building both a garage and house extension both with raft foundations due to the type of ground we have and nearby trees.
I've done the first pour of concrete for the raft and am about to add a ring of blocks around the edge before then doing the second pour to complete the raft. However I'm confused as to how the membrane that us under the raft ties into the walls. One suggestion was to come up the outside and then overlap it with the DPC at that level. The other was to lay the first course of blocks on it and bring it up the cavity and then tie into the DPC.
The problem I have with the first is that it'll be exposed and visible. The problem with the second is that the base of the foundation is resting on membrane rather than directly onto the slab.
Am I missing something ehre? Which is the typical/best route?
Difficult to find anything online that gets specific on this but others must be doing this.
Thanks
in advance.
Steve
I'm building both a garage and house extension both with raft foundations due to the type of ground we have and nearby trees.
I've done the first pour of concrete for the raft and am about to add a ring of blocks around the edge before then doing the second pour to complete the raft. However I'm confused as to how the membrane that us under the raft ties into the walls. One suggestion was to come up the outside and then overlap it with the DPC at that level. The other was to lay the first course of blocks on it and bring it up the cavity and then tie into the DPC.
The problem I have with the first is that it'll be exposed and visible. The problem with the second is that the base of the foundation is resting on membrane rather than directly onto the slab.
Am I missing something ehre? Which is the typical/best route?
Difficult to find anything online that gets specific on this but others must be doing this.
Thanks
in advance.
Steve