Damp coming from garden wall?

J

Jams

New Member
Hi Guys,

Just had the house plastered and have now noticed the corner where the garden party wall meets is very damp... I have raked out the mortar between the house and wall (wasn't bonded) and inserted dry rods on every vertical joint at a 45 degree angle (crossing the wall) into the main house and installed a DPM before repointing with SBR added mix. I have also sealed the coping stone (may need a lead flashing of some sort?)

But the damp persists and seems to be getting worse.. Next doors soil stack is not leaking and I can not see any leaks from the overhead gutter. Any suggestions? or do I need to wait for the damp rods to do their thing and to dry out. work was done about 2 weeks ago.

Thanks guys.IMG_6251.jpg
 

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If the garden wall is now completely free of the main house wall and the dpc runs top to bottom and below house dpc level then provided there are no rising damp issues, I would expect it should dry out. Can take 25mm per month though. May be worth raking out the joint a bit wider and then sealing all round with a polysulphide sealant.
 
OP,
1. Your pics show drilling and inserting Dri Rod holes - but the holes now need stopping with plugs of sand and cement.
I suppose you've done the same on both sides of the wall?
2. Presumably, the vertical DPC goes all the way down to ground level & spans the width of the garden wall?
3. Rake out to 25mm and re-point with S&C mortar - the house walls and the garden wall including the neighbours side.

All the damaged interior plasterboard(?) will need renewing.
If the cornerbead is rusting then cut it out, and replace with a plastic corner bead.
Is the floor solid or suspended?
Does the neighbour complain of similar damp?
 
qwas123 said:
OP,
1. Your pics show drilling and inserting Dri Rod holes - but the holes now need stopping with plugs of sand and cement.
I suppose you've done the same on both sides of the wall?
2. Presumably, the vertical DPC goes all the way down to ground level & spans the width of the garden wall?
3. Rake out to 25mm and re-point with S&C mortar - the house walls and the garden wall including the neighbours side.

All the damaged interior plasterboard(?) will need renewing.
If the cornerbead is rusting then cut it out, and replace with a plastic corner bead.
Is the floor solid or suspended?
Does the neighbour complain of similar damp?
Click to expand...

I have put the dry rods at 45 degree (shown in picture)
the vertical DPC goes all the way to ground and is full width just cut off 5mm shy of each side to allow for pointing.
would you recommend pointing up or using some form of sealant/mastic to stop any chance of wicking damp through the joint
 

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OP,
Any polyurethane sealant will work with a brick to brick gap.
Leave the coping stone as it now is, and shape & set back the DPC around its profile.
There are lots of variables that can affect penetrating damp but whatever, it will take far more than two weeks for any possible results to start to show.
Remember, you have to do both sides of the garden wall to gain any benefit.
 
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