Waterproof cement

[rhino666]

I have a newly built underground space that seeps damp with heavy rain.
There are a couple of area where something with more filling capacity/body than tanking is required.
How do I make a good waterproof cement mixture?

 

[kazuya]

you can buy waterproofing to add to your mix


http://www.wickes.co.uk/Wickes-Liquid-Waterproofer-5L/p/243001

 

[rhino666]

you can buy waterproofing to add to your mix


http://www.wickes.co.uk/Wickes-Liquid-Waterproofer-5L/p/243001

Thanks for this - wasn't sure if this sort of additive really did the job. I have 5 litres of Everbuild, Evermix 3 in 1 waterproofer, plasticiser and retarder. Would this do the job?

 

[theprinceofdarkness]

I think that product is only for damp proofing, If you read the instructions on a SBR additives, they quote resistance against water pressure to 10m, i.e. they are good for making a dam! Downside is they are a lot more expensive. i.e. http://www.bostik.co.uk/diy/product/cementone/SBR/212
Frank

 

[kazuya]

maybe wrong but way I read it, the cements just for filling in deep areas prior to tanking, so it doesn't need to be spending a lot, that's why I linked the cheapo stuff

 

[rhino666]

Thanks for the replies.........and for getting rid of the Indian spam - long way to come to sort out my underground storage

Very hard to find out proper information on these products. All I want is an additive to mix with cement to make it waterproof.

 

[freddiemercurystwin]

Waterproof cement for tanking FFS! If you want it to be dry then tank it properly, no cheapo bodgit fix will be effective.

 

[rhino666]

Waterproof cement for tanking FFS! If you want it to be dry then tank it properly, no cheapo bodgit fix will be effective.

FFS read the thread, this stuff looks as expensive as tanking anyways!

Tanking doesn't fill holes. I will be tanking after the holes have been filled. These are where water is seeping in around the floor membrane and where a plastic pipe exits at floor level. Because the tanking will be on or around floor levelling compound I don't want to bodge the hole filling bit just in case the tanking doesn't key properly.

Got summit useful to add freddymercurystwin from my neck of the woods please feel free.

 

[freddiemercurystwin]

Ahh yea OK my bad, Newlath is your friend, have a look at some of the numerous threads posted on on the forum for some guidance //search.diynot.com/forum_sear...reddymercurystwin&search=Search+Forum&stype=0

//www.diynot.com/forums/viewtopic.php?p=1201435#1201435

 

[rhino666]

Please see images for clarity.........

Untitled

• rhino666
• 12 Feb 2015
• 1

Untitled

• rhino666
• 12 Feb 2015
• 1

Untitled

• rhino666
• 12 Feb 2015
• 1

The floor has been levelled with FEB and the walls have been tanked with KA tanking. I applied the tanking myself - not that easy and had to add more water than recommended to make it brushable.

Heavy rain raises the water table and puts more hydraulic? pressure on the areas where waterproofing has not worked. It mainly comes in around the plastic pipe shown in pics 1 and 2 but also in some areas where the floor membrane finishes about 6 inches out from the wall.

I want to make up a waterproof cement mix using an additive to fill out the join between wall and floor and flow to beyond the floor membrane margin. Will then tank everything.

Perhaps the way forward is a cement mix using SBR instead of or together with water as a best effort at waterproof cement?

 

[freddiemercurystwin]

What are those plastic pipes?

 

[rhino666]

What are those plastic pipes?

There is only the one in the far corner. Builder built it in to drain water out but it is currently blocked with foam as drainage pipe not installed yet to join onto it. Waterproof cement will be needed externally and internally near this pipe installation as main area where water is getting in