Liquid Damp proofing Old Floor

[Drifterjoe]

Hi Guys,
Ripped up some tiles on an old floor today. Some of the tiles were came up very easily and there was a very slight damp feel.

It's obviously very minor rising damp as the tiles have been down 30 odd years.

I've looked at the mapei epoxy dpm but it's pricy and only need a very small amount as the affected area is small and the damp isn't that bad.

Any advice on a cheaper alternative that I can tile over? Whatever I use I'm going to SLC over the whole floor afterwards.

Cheers

 

[Qwerty]

@ISOMAT technical support @ISOMAT UK should see you alright

@Glynn is a Tilemaster guru..... they also do a suitable product

 

[Drifterjoe]

Hi thanks for that.

Anyone know if this would be suitable?

Sika Waterproof Coating Grey 5kg - https://www.NoLinksToThis/p/sika-waterproof-coating-grey-5kg/83502?tc=HB9&ds_rl=1249484&ds_rl=1245250&gclid=CjwKCAiAmb7RBRATEiwA7kS8VEBJTzh0Vy4XhQLyltXAifY9B7hrn512VjPP0kf7kwGhcsZCbBsIXRoCSi4QAvD_BwE&gclsrc=aw.ds&dclid=CIGW1KmWhNgCFSki0wodbhMIRA

Sika waterproof coating. It's cement based so if I Primed it then SLC over the top would it be ok? I only need to treat about 1m2 of the floor.

 

[Dumbo]

Hi thanks for that.

Anyone know if this would be suitable?

Sika Waterproof Coating Grey 5kg - https://www.NoLinksToThis/p/sika-waterproof-coating-grey-5kg/83502?tc=HB9&ds_rl=1249484&ds_rl=1245250&gclid=CjwKCAiAmb7RBRATEiwA7kS8VEBJTzh0Vy4XhQLyltXAifY9B7hrn512VjPP0kf7kwGhcsZCbBsIXRoCSi4QAvD_BwE&gclsrc=aw.ds&dclid=CIGW1KmWhNgCFSki0wodbhMIRA

Sika waterproof coating. It's cement based so if I Primed it then SLC over the top would it be ok? I only need to treat about 1m2 of the floor.

Phone sika technical then when they tell you it's alright ( if they do ) get them to email you a method statement .

 

[ISOMAT UK]

This is the data sheet for our internal liquid membrane. https://www.isomat.gr/wp-content/uploads/2017/07/e-ISOMAT-SL-17.pdfhttps://www.isomat.gr/wp-content/uploads/2017/07/e-ISOMAT-SL-17.pdf

 

[Flintstone]

I’ve used the Tilemaster dpm and it sets like rock. It’s not cheap tho, but do it once and do it right.

 

[Bond]

Cement based tanking systems such as sika , can be used in this situation. However if you are confident that rising damp is minor and won’t transfer or increase any, you could prime concrete with a couple of coats of SBR (moisture and salt resistant)
Coupled with a quality Slc, and tile adhesive - in such a small area, it should be fine.

 

[Dumbo]

If you do as above your levelling comp should be moisture tolerant . Something like arditex na or ultra level it 2. Some levellers will expand with moisture contact and fail .

 

[Slippery]

Sorry, can someone tell me what SBR is??

 

[Old Mod]

Sorry, can someone tell me what SBR is??

SBR StyreneButadiene Rubber
It can be used as an additive, or as a primer.
Generally needs to be diluted first.

 

[Bond]

You can also use the SBR as an additive to slc and tile adhesive, this will improve moisture resistance increase durability and flexibility of cement based products.

 

[Glynn]

I am not sure adding SBR to anyone's levellers is a good idea, we would not recommend it with any of our levellers. If you need a leveller, use a moisture tolerant one that is designed specifically to work with moisture as jcrtiling has said. You could tile direct to the concrete with the correct adhesive as some tile adhesives are moisture tolerant and will allow the moisture to pass through them but themselves are impervious to the moisture and the moisture will then migrate through the grout joints.

 

[Flintstone]

Does ultimate offer that @Glynn ?

 

[Bond]

SBR can be used in any cement based product which will improve durability water resistance, strength and flexiability, l use it extensively for over 20 years in all situations , with only positive results. Please tell how you consider it not to be a good idea, interesting to see how you justify your claims?.

 

[Glynn]

Does ultimate offer that @Glynn ?

Ultimate is not the one I was thinking of and has I am company support I am not suposed to advertise our products on the forum, but if you wish to contact me through our technical department I will go through it with you.

 

[Glynn]

SBR can be used in any cement based product which will improve durability water resistance, strength and flexiability, l use it extensively for over 20 years in all situations , with only positive results. Please tell how you consider it not to be a good idea, interesting to see how you justify your claims?.

The reason I have said "I am not sure adding SBR to anyone's levellers is a good idea" is because these products are developed by chemist over a long period of time by mixing up to sixteen different ingredients together testing them, adding ingredients, taking ingredients out, finding out that this ingredient does not work with that ingredient and changing ingredients again until after many many monthes of testing and field trials the cement based product has the correct balance and ratio of ingredients that all work together, so the produt will work and do has it was intended to. One of our products has 50 grams per 1,000kg batch, so upsetting the balance would not be to difficult. By adding SBR you also run the risk of altering the rheology of the product, which in a leveller can affect the flow rate and suface finish and with an adhesive will make it thicker and in some cases harder to serrate out. Adding SBR, or any other polymer or chemical without first checking the suitability with the manufacturer could easily upset the delicate balance of the ingredient and in the extreme, could cause an adverse reaction and a product failure. If you feel the need to add anything to a product to "improve it", would it not be better to choose a higher specification of product in the first place? If you are thinking of adding anything to cement base products it would be wise to check with the manufacturer first.

 

[Bond]

Thank you for your full and thourer explination.
I have been using SBR as a bonding agent and additive since 1989. Lots of manufacturers of cement based product promote its use. To the OP , l suggested it’s use as a primer , as it is salt and moisture torrerant, with the addition of same to the slc and adhesive. As it’s addition throuout the system - as the active molecules form chain like structures creating a superior bond throughout whilst adding additional water resistance and flexibility to the system. l will personally continue to use it in this way. It’s not always possibly to obtain as you say superior products,not in the highlands anyway ,so we tend to make do and modify, more than our southern friends. Cheers the noo.