steveoelliott Posted March 15, 2021 Share Posted March 15, 2021 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??? Link to comment Share on other sites More sharing options...
Mr Punter Posted March 15, 2021 Share Posted March 15, 2021 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. 1 Link to comment Share on other sites More sharing options...
Temp Posted March 15, 2021 Share Posted March 15, 2021 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. 1 Link to comment Share on other sites More sharing options...
Declan52 Posted March 15, 2021 Share Posted March 15, 2021 Pu adhesive. But make sure you dry fit everything first as when it goes off you won't be able to do any adjustments. 1 Link to comment Share on other sites More sharing options...
nod Posted March 15, 2021 Share Posted March 15, 2021 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 1 Link to comment Share on other sites More sharing options...
steveoelliott Posted March 15, 2021 Author Share Posted March 15, 2021 (edited) 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 Link to comment Share on other sites More sharing options...
SteamyTea Posted March 15, 2021 Share Posted March 15, 2021 PU quite often used water as part of the curing process. Link to comment Share on other sites More sharing options...
Mr Punter Posted March 15, 2021 Share Posted March 15, 2021 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. Link to comment Share on other sites More sharing options...
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