Stone work, dampness and pumped cavity

wclarke20

I am self building and I am ready to start the natural stone facing on the front of my house in the next few days. I am looking for some information and what I've got so far seems to be quite varied. I was wondering about how to combat the moisture coming through the stone and in to the inside walls. I must note that the cavity will be pumped.
Some people are telling me I must put up a waterproof membrane between the natural stone and the outer leaf and others say that the pumped bead can handle this moisture.

Has anybody got any thoughts on this?

Eoghan Barra

If I were doing a stone faced house, I would consider using this stuff:

http://www.surecav.com/

It eliminates the need for an outside leaf of blocks to build your stonework up to, thereby saving time and money (I presume? I don't know how much it costs). It also makes the wall thinner (or, even better, allows more space for a wider cavity, i.e extra insulation) and claims to ensure a dry inside wall.

I have never used it though, so have no personal experience of it.

bbam

wclarke20 wrote: »

I am self building and I am ready to start the natural stone facing on the front of my house in the next few days. I am looking for some information and what I've got so far seems to be quite varied. I was wondering about how to combat the moisture coming through the stone and in to the inside walls. I must note that the cavity will be pumped.
Some people are telling me I must put up a waterproof membrane between the natural stone and the outer leaf and others say that the pumped bead can handle this moisture.

Has anybody got any thoughts on this?

What does the IAB cert for the pumped product say in relation to natural stone finish.

If it's not certified to use with natural stone I'd be looking at other options, there should be a map of locations where wind driven rain exposure may be a problem.

esox28

just put on a gray/ scratch coat of sand, cement and waterproofer onto the external block before stone is applied this will combat any moisture penetrating the cavity.

have you decided on position of window/door in relation to stonework?

wclarke20

esox28 wrote: »

just put on a gray/ scratch coat of sand, cement and waterproofer onto the external block before stone is applied this will combat any moisture penetrating the cavity.

have you decided on position of window/door in relation to stonework?

The architect and insulation guy recommended not putting any membrane on as the house should be allowed breathe.

This is a really good idea though. I have proceeded with the standard method so not an option now.

tred

wclarke20 wrote: »

The architect and insulation guy recommended not putting any membrane on as the house should be allowed breathe.

This is a really good idea though. I have proceeded with the standard method so not an option now.

There would be a sand and cement mix under ur normal nap finish, so, you do the same with the stone finish. Crazy otherwise, also make sure the stone mason is using waterproofer in his mix. This is what I did. no issues. and i pumped the cavitys as well...