Rendering etc. with waterproof membrane… what to do

[centralLondonJOHN]

My immediate neighbour has had their coal cellar (those were the days) ‘tanked’. This all done many years ago, the co. now not trading. So I would like the terms by which this can be described; is it tanking w/ a water barrier , rendering with an admixture, gunerable cement that I can see that it is brushed with a coir brush but has no membrane since it is a little bit spoilt with water ingress.

So, all my searches have come to nil. Other than Newton CDM which I have used more than 20 years ago.

 

The work, 20 odd bricks to be added to the reveals, a thin 40mm concrete load bearing lintel, say 1000mm x 150mm x 40mm. The waterproofer, render and an oak frame door set or better.

Where can I order such a lintel?

Thank you in advance,

John 

[Mr Punter]

I am not sure I got what you were asking but the thinnest concrete lintel off the shelf is 65mm.  You could cast one yourself if it needs to be 40mm.

[centralLondonJOHN]

Is it possible to buy thin reinforcement bar? Less than the 12mm?

[Mr Punter]

5 minutes ago, centralLondonJOHN said:

Is it possible to buy thin reinforcement bar? Less than the 12mm?

 

 

Yes.  8mm is commonplace.

[centralLondonJOHN]

Ok, one down ...

I am very keen to understand the render?, is it two coat/ one coat, gunned on render. Some guidance here would be very useful.

[Russell griffiths]

Tanking slurry, you can buy it mixed in a big bucket, look at your local builders merchants 

lintel, you can get an internal steel lintel that is a galvanised steel in a wavy shape to add strength approx 30mm high. Again local builders merchants. 

 

[centralLondonJOHN]

Bags to go on with RG. Probably what I was after, thank you.

[saveasteading]

[centralLondonJOHN]

This Catnic product certainly  adds to the mix. Thank you

[centralLondonJOHN]

So I have now moved onto our own cc and a photo shows what I am up against. Not enough yellow stocks from the 1820's. But I can get over that with reds and render. I'm cleaning the bricks in two parts they are so friable and breaking into two. CP1 clear as made some hidden repairs.

Initial cleaning, then lime bedding the bricks and then a final cleaning in the summer.  Final joint work soon. No new painting!,

 

I am asking for advice as to where to place the first horizontal DPC band. Would it be between the 1st course and the pre-stressed lintel, or underneath the lintel where I will be putting the 2 vertical DPC bands for the timber frame and door. 

 

The detailing is tight. Behind the frame former the ghosted arch of the vault can be seen in the Left Hand corner. This shows that little or no continuity of the DPC further back to the 2nd course of brickwork.

 

Thanks in anticipation, John