Ply joins showing through Karndean

Hi

What is causing the joins in the ply to show through the Karndean as shown in the pic below and how can this be fixed? The joints were feathered when they ply was put down.

 

was the ply acclimatised?

 

no idea? They just brought the ply and fitted it and feathered the joins and then laid the Karndean the next day

trying to upload a pic but the forum is not allowing it?

 

Have a look through this thread..
http://theflooringforum.com/showthread.php?12053-Karndean-problem-subfloor&highlight=joins+showing

 

What ply was it? Where was it from?

 

Oh dear so after all the advice, it's still wrong? Something sounds odd on this one, please upload pic

 

I cant upload a pic to the thread?

Yes same floor

Not sure where the ply was from or what its quality was like I had a Karndean approved installer to fit the flooring? What is the resolution to joins showing through, its only on one part of the floor

 

Could be a subfloor problem , bouncing floorboards working ply loose, poor quality ply, not feathered ply properly, ive even seen fiters use plasload nails/ staples to fix ply which is daft, any of these I suspect.

 

As the song goes .... rip it up and start again

 

Anybody knows the original thread link for this ?

 

There's a lot to say on that thread..

 

Could be using mixed ply from different suppliers that comes out slightly different in thickness

 

How old is the house?
Air bricks? as it's got floorboards

 

I said this in my first post .. I think it's a subfloor problem

 

The house is about 60 years old, suspended floors with air bricks and good air circulation below. The floor that the ply was put onto was the original canadian maple flooring.

I can't see how there would be moisture in the floor as the ply join is only showing through in one part of the floor. Could it be that the 2 pieces of ply are too tight to each other and with expansion/contraction have moved slightly?