PU Adhesive vs Mortar for Copings

[steveoelliott]

Hi,

 

Having now opted to go with porcelain copings for my parapet walls... I have the option of either using standard mortar with SBR bridge or a PU adhesive.

https://www.castlecomposites.co.uk/product/adhesive/

 

I'm guessing in theory this should be more watertight than cement, hold better and be less prone to cracking.

 

Any thoughts???

 

[Mr Punter]

Would decent tile adhesive give a better bond?

 

When the bond fails with tiles, it tends to be on either the tile or the substrate, which is why they are often best primed / back buttered.

[Temp]

I've used PU adhesives to stick hard to glue materials like plastic trim on cars. I've also struggled to get mortar to stick some non-porus stone. Never thought to use PU on the latter.

 

I'm thinking that the PU adhesive will probably stick very well if the brick and tile is dry, but perhaps not so good if they are damp? On the other hand mortar can usually cope with a bit of damp because its water based.

[Declan52]

Pu adhesive. But make sure you dry fit everything first as when it goes off you won't be able to do any adjustments.

[nod]

1 hour ago, steveoelliott said:

Hi,

 

Having now opted to go with porcelain copings for my parapet walls... I have the option of either using standard mortar with SBR bridge or a PU adhesive.

https://www.castlecomposites.co.uk/product/adhesive/

 

I'm guessing in theory this should be more watertight than cement, hold better and be less prone to cracking.

 

Any thoughts???

 

Flexible tile adhesive will allow you to bed them and will stick like sit to a shovel 

[steveoelliott]

Thanks all for your inputs...

 

One concern I do have re the copings themselves (they are porcelain) is they are only 20mm in thickness https://www.castlecomposites.co.uk/product/porcelain-coping-stones/ Normal concrete copings are a lot thicker.

 

I am going to have a DPC under the copings as a secondary defense should water get through the joints.

Edited March 15, 2021 by steveoelliott

[SteamyTea]

PU quite often used water as part of the curing process.

[Mr Punter]

4 hours ago, steveoelliott said:

I am going to have a DPC under the copings as a secondary defense should water get through the joints.

 

I thought this may be the case.  A bit of a pain under thin tiles.  Not much sticks to DPC very well.