Concrete wall waterproofing ?

rwaldron21

Hi all,

Does anyone know the best product to use to waterproof the top side of my shed wall. ( see attached pic for wall and slope).
Is there something I can paint on that will prevent water coming through ?

xabi

I cant see how water will come through.

rwaldron21

The garden wall and the shed wall have a 1 inch gap. the gap was covered years ago with a concrete slope to help the rain run off.
the inside of the shed wall is ALWAYS damp...so looking to waterproof the exposed side of the shed wall and slope.

SC024

Fix a lead flashing onto the shed wall & turn down over the garden wall & then render the wall of the shed down onto a stop bead fixed over the lead flashing.

rwaldron21 wrote: »

The garden wall and the shed wall have a 1 inch gap. the gap was covered years ago with a concrete slope to help the rain run off.
the inside of the shed wall is ALWAYS damp...so looking to waterproof the exposed side of the shed wall and slope.

Calahonda52

long run/not much access there so I would use the torch on felt, in strips, starting at the bottom

listermint

Calahonda52 wrote: »

long run/not much access there so I would use the torch on felt, in strips, starting at the bottom

Ya I'd just do that. Keep it simple.

rwaldron21

Thx for the replies,

aside from flashing or felt is there any solvent based sealant that I could just brush on instead ?

This below seems too good to be true ?

https://www.screwfix.com/p/no-nonsense-water-repellent-seal-clear-5ltr/57474?_requestid=144349

Calahonda52

rwaldron21 wrote: »

Thx for the replies,

aside from flashing or felt is there any solvent based sealant that I could just brush on instead ?

This below seems too good to be true ?

https://www.screwfix.com/p/no-nonsense-water-repellent-seal-clear-5ltr/57474?_requestid=144349

that stuff only works on smooth surfaces such as plastered walls, the blockwork is far too porous for it.
it only lasts about a year anyway.
How much access do you have to it?

rwaldron21

Access to the back of the shed ?

full access, the shed backs onto an open green area.

Is there any product I could brush onto the blockwork ?

There's plenty of products claiming to be able to waterproof the concrete but I need someone that knows a product that defo works.

If flashing of felting is the answer then I would need to get someone else to that, but I could brush a product on myself .

Thx for your help

Calahonda52

what length is it?

maybe this as a diy job
https://www.selcobw.com/bostik-flashband-original-grey-10m-x-600mm

not cheap but is a diy job, just look up the videos

SC024

I think the only way to do it right is as I said, torch on etc is just taking the lazy option imho. it would never look right. Same for any of the paint on liquids. only a temporary measure I don't see them lasting.

mikeymouse

Tanking slurry might do the job?

builditright

rwaldron21 wrote: »

Hi all,

Does anyone know the best product to use to waterproof the top side of my shed wall. ( see attached pic for wall and slope).
Is there something I can paint on that will prevent water coming through ?

Hi this product will work can be brushed on .