To refresh this is a small cloakroom, suspended floor with granite tiles 1.5m2.
=============================================
Previous topic was on plywood vs. chipboard - plenty of advice on that; thanks - I am definitely fitting plywood! I have started this topic new as it relates to adhesive etc., but follows on from the other one.
Lots of family catastrophes means I haven't done this job yet but am about to put down this piece of very robust 25mm marine ply that I picked up as a cheap offcut from timber merchant - perfect!?
Despite having spoken to BAL tech helpline (closed today Sat 23-Mar), and Topps previously, and purchased based on their advice; I just called Topps to check and the manager now says I have the wrong adhesive, but was his suggestion in the first place.
That was when he had persuaded me to have Hardiebacker over my MR chipboard - which somebody else had persuaded me to buy. I returned the Hardiebacker as I now have 25mm ply and was told the BAL Rapidset flexible would be Ok!!
Now he is confusing me saying the ply needs priming even on the adhesive surface, the opposite to BAL and advice from here. Oh, and he says to NOT prime the under surface according to him!? He recommended the BAL acrylic primer as good as SBR but cheaper. But I have the primer so want to now use it.
>>!! Once I have learned enough from you guys, I can tell the others where to get off!! Confusing and conflicting or what?? But it's opinions - everyone's got one - some based on knowledge and experience - unfortunately too many are not!
Summary I have the following materials .....
25mm plywood, Black granite tiles, BAL Micromax grout (flexi), BAL Rapidset flexible grey 10kg, BAL primer. I prefer to use them if possible as late returns are always a battle.
I want to fix the ply down now then get on with the job.My network of joists and noggins supoports at least every 250mm apart.
My Questions – your answers please
Q1 > Do I prime the back face (the one on the joists) and edges - but not the top adh face - with BAL primer?
Q2 > Do I screw down at very close intervals 150 to 200mm intervals
Q3 > Should I also glue it down – gripfill / NoNails etc? There are a few undulations as ply has a very slight bow, but will pull down with screws?
Q4 > Should I leave the top ply surface UNTREATED - just sanded?
Q5 > Can I use the Rapidset flex adh direct on ply? - Topps manager says no, it will absorb adh too rapidly and to use the BAL primer. He also says that now I don't have Hardibacker it should be a single part flex adh? - that only comes in 20kg ££lots
Q6 > Which adhesive and do I prime ply or not?
I will have other questions I am sure, but this is ample for now.
Any confirmation of the above would be much appreciated so I can get on with it.
Many thanks.
=============================================
Previous topic was on plywood vs. chipboard - plenty of advice on that; thanks - I am definitely fitting plywood! I have started this topic new as it relates to adhesive etc., but follows on from the other one.
Lots of family catastrophes means I haven't done this job yet but am about to put down this piece of very robust 25mm marine ply that I picked up as a cheap offcut from timber merchant - perfect!?
Despite having spoken to BAL tech helpline (closed today Sat 23-Mar), and Topps previously, and purchased based on their advice; I just called Topps to check and the manager now says I have the wrong adhesive, but was his suggestion in the first place.
That was when he had persuaded me to have Hardiebacker over my MR chipboard - which somebody else had persuaded me to buy. I returned the Hardiebacker as I now have 25mm ply and was told the BAL Rapidset flexible would be Ok!!
Now he is confusing me saying the ply needs priming even on the adhesive surface, the opposite to BAL and advice from here. Oh, and he says to NOT prime the under surface according to him!? He recommended the BAL acrylic primer as good as SBR but cheaper. But I have the primer so want to now use it.
>>!! Once I have learned enough from you guys, I can tell the others where to get off!! Confusing and conflicting or what?? But it's opinions - everyone's got one - some based on knowledge and experience - unfortunately too many are not!
Summary I have the following materials .....
25mm plywood, Black granite tiles, BAL Micromax grout (flexi), BAL Rapidset flexible grey 10kg, BAL primer. I prefer to use them if possible as late returns are always a battle.
I want to fix the ply down now then get on with the job.My network of joists and noggins supoports at least every 250mm apart.
My Questions – your answers please
Q1 > Do I prime the back face (the one on the joists) and edges - but not the top adh face - with BAL primer?
Q2 > Do I screw down at very close intervals 150 to 200mm intervals
Q3 > Should I also glue it down – gripfill / NoNails etc? There are a few undulations as ply has a very slight bow, but will pull down with screws?
Q4 > Should I leave the top ply surface UNTREATED - just sanded?
Q5 > Can I use the Rapidset flex adh direct on ply? - Topps manager says no, it will absorb adh too rapidly and to use the BAL primer. He also says that now I don't have Hardibacker it should be a single part flex adh? - that only comes in 20kg ££lots
Q6 > Which adhesive and do I prime ply or not?
I will have other questions I am sure, but this is ample for now.
Any confirmation of the above would be much appreciated so I can get on with it.
Many thanks.