Damp course problem

[NickStone]

According to my search on the Internet (brick companies, etc) the base of wall dpcs should cover the 'full width of the masonry leaf if they are to prevent the passage of moisture effectively'. In my 1970s property, the dpc is a little rebated and has been covered with pointing, some of which is now crumbling. I've brushed out the crumbly bits but obviously I don't want to replace it with new pointing, if the pointing should not have been there in the first place.

On the other hand, if I just leave it as it is, there will be a nice gap for moisture to collect. I obviously can't fix the existing dpc, but I was wondering whether to fill the gap with mastic. I actually have a carton of black caulking intended to be used to seal decks on yachts (bought it originally to seal gaps in floorboards). Would this work? Or if not, what would folks recommend? Many thanks.

 

[The-brickie]

I would have thought the stuff you have is for timber only.

I would re-point with a cement mortar that has a waterproof additive in it.

 

[NickStone]

I would have thought the stuff you have is for timber only.

Good point!
I would re-point with a cement mortar that has a waterproof additive in it.

A waterproof additive makes sense. Thanks for your help. I suppose for good measure I could paint a little bitumen (eg Aquaprufe) over the top of the mortar. As you can guess, I'm a bit of a belt and braces person.

 

[The-brickie]

Mmm, that might do more harm than good as the new mortar will not have anything to bond to, being that it is a small area.

 

[NickStone]

Mmm, that might do more harm than good as the new mortar will not have anything to bond to, being that it is a small area.

Sorry, I've confused you I meant I'd put the mortar in first.

 

[The-brickie]

Its old age, sorry

Dont think you will need too, but if you really want too then its your choice.

 

[NickStone]

Thanks, Brickie. Will take your advice.