Many installers have issues with all plywoods mate. Going thicker is not the answer for failed floors tho. If plywood fails due to it moving there is a reason why its moving. Its a natural product and is moving because you have changed the environment its used to and it is adjusting to suit that environment. Basically if its moving then the installer has done something wrong or not installed in a area suitable for the product or not taken in to consideration what the product is going to do hence allowing for its movement on install. Install it correctly then you will not have any issues.
I have only used 9mm in the last 6 months and think it's spot on. I do sand / plane any bad floorboards 1st still but finding it's better quality ply so been happy with it.
It just feels better to walk on more secure along with better to secure down.As against the grain 4mm is a no no for me anyway especially on full stick.I feel that it is a better floor.
too much flex in a 4mm ply, also i thought building regs stated that 4mm ply when used in conjunction with any fully stuck flooring isn't up to code? as the flooring becomes part of the building.
When you say too much flex in 4mm how do you mean? which building regs is that regarding also. Do you have more info so i can look into it.
We can argue all day Matt about this.Maybe we should ask everyone what they think of 4mm and the situations where it is suitable to use.
not argue mate, just after your points of why you think its not suitable. There are a lot of products that people believe are not suitable due to they have had issues but normally its down to the method of how its been used or what is expected of the product. If you believe there is issues with the product then i will look into your issues. Like i have said before, i can test any product and i can also make any condition for a product to see if it does what it says on the tin. If you can point out a issue with the product then obviously i need to know and so does everyone else so we can stop using it. :thumbs
I would only of used 4mm on very good chipboard, but stopped years ago. I think it's too thin to lay over floorboards and your better off using 9mm. Most of the builder work I do I use 6mm as they won't pay out for 9mm. it was hardboard for years which showed all the cupped floorboards. No one was bothered.
Daz, i need to know why you dont use 4mm so i can advice what is going wrong for you or if there is a issue with 4mm so i can look into it and change the recommendations round using the stuff if there is issues. If we dont know about the issues then there is no reason for us look into it and work with you all .
Its the fixing down thats the problem.If you look at how the "thin ply" has deteriorated over the years it really is worth upgrading to a better quality.I know that you lads run courses but not to offend anyone this is my personal opinion.
i can't remember what reg it is but it's to do with the stress the building puts onto the ply as far as i can remember 9mm is what they recommend to allow for contortion.
