Hi Guys
new to the forum, been browsing through the last week as there’s plenty of info and looks like people have had similar issues to what I have, but I haven’t come across a solution as yet.... if there is one!
Wasn’t sure to post this under Render or Damp
Just had my garden landscaped, but the builder hasn’t put any form of damp proofing on the earth side of all the retaining walls, these are now all back filled and top finished (turf, patio & decking) also no drainage fitted apart from a few weep holes. also raised flowerbeds built from block with no damp proofing
All retaining walls are constructed in standard 4" solid block and will have copping stone on the top. all the retaining walls were planned to be rendered white. using Webber Pral-M, but... without any DPC it now looks like rendering straight onto the block is a no go.
I need to come up with a solution to have the walls finished which is going to last.
I have looked at the cement weatherboards, but after speaking to manufacturer (James Hardie) they informed me these would not be suitable and would breakdown after 12 months.
Looked at meshed Tanking membrane (8mm) from Permagard & Alderburgh. spoke to their tech guys and they said they are really designed for internal use so couldn’t comment on external, but Permagard did say they have had reports of render cracking when people have used it externally. (guessing freezing water behind could expand and pop the render off)
There’s tanking slurry, but am I right in thinking this won’t allow the block to breath and allow the water to pass through, and lead to a premature breakdown of the wall over time and freezing conditions.
Pics attached
Any one a solution to this?
As it stands I’m thinking the mesh tanking membrane is probably my best bet, but not ideal.
Can you get flexible render? Which may limit the risk of cracking?
Thanks
Dave
new to the forum, been browsing through the last week as there’s plenty of info and looks like people have had similar issues to what I have, but I haven’t come across a solution as yet.... if there is one!
Wasn’t sure to post this under Render or Damp
Just had my garden landscaped, but the builder hasn’t put any form of damp proofing on the earth side of all the retaining walls, these are now all back filled and top finished (turf, patio & decking) also no drainage fitted apart from a few weep holes. also raised flowerbeds built from block with no damp proofing
All retaining walls are constructed in standard 4" solid block and will have copping stone on the top. all the retaining walls were planned to be rendered white. using Webber Pral-M, but... without any DPC it now looks like rendering straight onto the block is a no go.
I need to come up with a solution to have the walls finished which is going to last.
I have looked at the cement weatherboards, but after speaking to manufacturer (James Hardie) they informed me these would not be suitable and would breakdown after 12 months.
Looked at meshed Tanking membrane (8mm) from Permagard & Alderburgh. spoke to their tech guys and they said they are really designed for internal use so couldn’t comment on external, but Permagard did say they have had reports of render cracking when people have used it externally. (guessing freezing water behind could expand and pop the render off)
There’s tanking slurry, but am I right in thinking this won’t allow the block to breath and allow the water to pass through, and lead to a premature breakdown of the wall over time and freezing conditions.
Pics attached
Any one a solution to this?
As it stands I’m thinking the mesh tanking membrane is probably my best bet, but not ideal.
Can you get flexible render? Which may limit the risk of cracking?
Thanks
Dave
