Vertical DPC

[godfather66]

Some years ago we had an existing open porch enclosed. One of the now internal walls (which was external brick) was plastered. Ever since damp from the adjoining outside brickwork has permeated through to the inside blowing the plaster and lifting the paint.
Have tried sealing the brickwork outside with silicone. No good. Have tried sealing internal plaster wall with various waterproofing mediums. No good
Can anyone suggest a way of stopping? Is a vertical dpc possible?

 

[Kingfisher20]

Yes a vertical DPC is possible by drilling holes at an angle and filling with "injection mortar", applied usually through a manual pointing type gun. Probably need more info to help you with this one however. If the moisture is penetrating laterally it may be that you just need a higher solids water seal as there is a HUGE difference in effectiveness between different products. What did you use and how may applications?

 

[noseall]

It may be down to the position of the frames relative to the external leaf of brickwork.

If the frame is fitted too far forward, i.e. close to the external face then this leaves some of the the external brickwork protruding beyond the frame internally.

A vertical dpc would be of no use in this instance as the barrier between inner and outer masonry would still be compromised.

This is why architects insist frames are positioned far enough back (in towards the inner leaf) so that they entirely cover the connection betwixt inner and outer leaves.