How to add a concrete layer before tiling?

[Markcub]

Hi,

I want to pour a thin layer of concrete over existing concrete to raise it up prior to tiling it. How do i go about this.?

[Markcub]

Thanks, could i also use the below primer / sealer as i have some left from a previous job a few years ago or does it go off after a while.

[JacobZ]

Hi @Markcub,

Unfortunately, LANKO 124 Ultraprime has a shelf life of 12 months, so you wouldn't be able to use the leftover.

It would definitely be worth using, but you would need to grab some fresh stuff.

Let me know if you have any further questions.

Jacob

[Markcub]

No worries, ill buy fresh. Just one other thing, i will need to seal between the coping tiles and the pool. Do you have anything you can suggest doing that or can i use any silicone.?

[JacobZ]

Hi @Markcub,

There are silicones specifically designed for use in pools, such as SikaSil Premium Pool Silicone, Maxisil Pool Silicone or Selleys Marine Flex Sealant.

Any of these options will work, it is just down to selecting the one that suits your colour palette best.

Let me know if you have any further questions.

Jacob

[Markcub]

Hi Guys,

After i have primed i need to raise the level up a little behind where the tiles currently are. The new tiles will go back further and there is a little drop off. Will sand and cement mix adhere to the existing concrete or am i better using the leveller.?

[MitchellMc]

How high is the little drop off @Markcub? If it's within the max application depth limits of the self-leveller you're using, then I'd suggest you level the area all in one go with it. Alternatively, you could use sand and cement to fill that area first, though it doesn't have any self-levelling properties, so you would need to ensure you level that area manually.

Mitchell

[Markcub]

Hi Mitch,

The drop varies between 20 and 30mm.

[JacobZ]

Hi @Markcub,

The Lanko 20kg 173 Floor Leveller has a maximum application thickness of 25mm, so you might have to top up any of the lower spots with a repair mortar such as Dunlop Ardit Rapidset Repair Mortar, allow it to dry, paint it with your primer, then pour the self-levelling compound over the top.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob

[Markcub]

Do bunnings do tile spacers/leveling for 20mm porcelain tiles.?

[Markcub]

Thanks Jacob,

So the repair mortar will stick to the existing concrete bed.?