20mm brick slips on 12mm ply

[Jamorgan90]

hi all,

Looking for some advice. Tiling 20mm thick brick slips onto 12mm ply wood on the walls. It is fixed very well. I am just wondering what prep people would do and what adhesive you would use. Changing the ply for plasterboard or hardi is not a option.

 

[Qwerty]

Why is another substrate not an option?

 

[Rookery]

Inside, outside??

 

[One Day]

Ply is not suitable these days. Everywhere I look I see failures involving ply.
Save yourself the risk and overboard it with 6mm wedi board or similar. (even dare I say it - 6mm hardibacker)

 

[Bond]

If your sticking with the ply, a flexiable cement based adhesive, prime well and apply slurry or burn a tight coat of flexi adhesive on to ply . Before applying slips.

 

[Bond]

Should have said above, use SBR in the slurry or burn coat.

 

[Qwerty]

But you will still have the issue's with expansion and contraction, swelling etc

 

[LM]

Why do something that is more than likely to fail?
Either replace or over board the ply.

 

[Bond]

If you use SBR and water at 50/50 there should be no issues with flexiable cement based adhesive over ply. Most failures occur due to inadequate preparation. Remember the ‘p, prior planning and preparation prevents **** poor performance.

 

[Perry]

Dont do it. I do it for a living.

 

[Bond]

I would be confident enough to do it,( no problem) it’s up to the OP.
He said changing or over boarding is not an option.

 

[Perry]

I have seen the aftereffects many times. People injured court cases.

 

[Bond]

If done correctly, there should not be any problems.
In March of this year, done a job with random stone slips ( up to 30 mm thick) on a feature, behind a free standing log burning stove. Was a bit apprehensive initially, however it worked , a that was with open joints ( without grout or pointing).

 

[Jamorgan90]

Inside, outside??

Inside

 

[Jamorgan90]

Dont do it. I do it for a living.

What makes you think i do not? Because I am asking a question and don't act like I know everything?

 

[Jamorgan90]

If you use SBR and water at 50/50 there should be no issues with flexiable cement based adhesive over ply. Most failures occur due to inadequate preparation. Remember the ‘p, prior planning and preparation prevents **** poor performance.

Would you recommend using tile masters prime grip first then ?

 

[Perry]

You fix brick slips for a living? I have seen jobs that have been there for 20 years and no problems on ply. I have also seen jobs done by the same builders after a day on ply and the slips are on the floor. if its in your house and they are not likely to hurt anyone if they fall off. It may be worth the risk 90% if the ply has been fixed correct you will get away with it. I fix them in shops etc so if they fell on someone I would be sued for alot of money. Also I find it hard to see that the ply couldn't be removed. look at this link.
river-island | - https://www.brickit.biz/projects/river-island-2/

 

[Bond]

Would you recommend using tile masters prime grip first then ?

Sorry don’t have any experience of that product.you could check with there tech people. Also give the ply a good key, l used 40 grit sandpaper, and a rub over with damp sponge, before applying the SBR.

 

[Jamorgan90]

You fix brick slips for a living? I have seen jobs that have been there for 20 years and no problems on ply. I have also seen jobs done by the same builders after a day on ply and the slips are on the floor. if its in your house and they are not likely to hurt anyone if they fall off. It may be worth the risk 90% if the ply has been fixed correct you will get away with it. I fix them in shops etc so if they fell on someone I would be sued for alot of money. Also I find it hard to see that the ply couldn't be removed. look at this link.
river-island | - https://www.brickit.biz/projects/river-island-2/

I have fitted thousand of m2 of brickslips for many shops. Pret , body shop and miller & carter. Mostly onto plywood and haven't had a problem but I am always looking for new and better ways

 

[One Day]

The issue is the ply these days is rubbish and seems contaminated with oil, wax or something which prevents cement keying like it used to. There are flooring grade plys now, but they are rare and expensive.

Seems like a good idea to sand,wipe and prime but really isn't it faster and safer to just overboard with 6mm of something more suitable?

Ply just isn't what is used to be...

 

[Perry]

So why are you asking silly questions if you know what you are doing?

 

[One Day]

no such thing as a silly question on a forum surely?

...plenty of silly replies though!
(especially in recent days)

 

[Perry]

Or are you James morgan of Reclaimed brick slips?

 

[Deleted member 49260]

Or are you James morgan of Reclaimed brick slips?

I thought I knew the name, mosaics on steroids brick style

 

[Perry]

Impish
Not strange.
String.

is it a wind up?

 

[Bond]

External grade plywood with hardwood veneer most hardwoods will contain natural oils, which can make it difficult to bond to - hence the reason to key and prime well.