Was round a friends house earlier and he had a flooring company round to price up for karndean ( as always good to know what others near by are charging ) and the bloke was saying his wood blocks all have to come up and be bulk filled back to original level as plywood over wood blocks will cause dry rot within 6 months and the floor will need replacing, is this true why have I never heard this before as the old company I worked for always got us to ply over wood blocks if a vinyl of some type was going down
he's right. I wouldnt put ply over wood blocks, too many things 'could' go wrong Best just to rip up and start from scratch
Thanks got job I've looked at 240 sq of polysafe to go down but wood blocks down and they have had new stud walls built 2 new kitchens put in and male and female toilets built on top of wood blocks in a school and they were moaning about price already so there's no way they would pay for bulk filling with chipping, do people really pay to have all that work done ? Having just learnt this that is what I'll be pricing for from now on, thanks learn something new every day
Also mate, there properly won't be a dpm under the woodblocks. So in that case a good way to go is take up then asphalt. That way it building the height back up and it's a dpm.
True the blocks will rot away and like Daz said there will be no dpm. Heres one though which has really got my goat up, doing a grade 2 listed barn at the moment which is going to be a vets. Had a major discusion with the guy from the herritage whos is point blank refusing to allow me to install 6mm ply for the karndean and says 4mm is all they will allow, I've tried till I'm blue in the face telling him its not what karndean recomend even showing him their installation guidlines and he still ain't havin it grrrrrrrrrrr.
Jay Organise a site visit from your karndean rep.. Let him explain to them the reason why 6mm is what they advise and the reason to maintain the warranty :thumbs
Already tried they ain't interested, I had a battle just to get 4mm in there. Its grade 2 listed so they make the rules and they ain't budging. So had my sister whos a solicitor draft me up an official document for everyone to sign off on, so they all understand and theres no coming back on me.
How big is the area mate? If it was a decent size id be telling the rep he could lose the order unless he got his arse up here and backed me up
Cool its 200m2 of Davinci 16 x 16 tiles, and the rep did come out to the meeting and felt he was just banging his head against a brick wall. Its rediculous mate its their way or no way at all, they won't even let the client have feature strips or borders which is a bit of a god send makes my job easier. I mean don't get me wrong but I'll fit 4mm ply everyday of the week, but I know this is wrong should be 6mm. WHY IS IT WE ALWAYS SEEM TO TAKE IT IN THE ARSE FROM THE POWERS TO BE.
Thats what the rep said and they don't seem to care even though the client does hence why I've made everyone including the jobs worth from the herritage sign my document if goes south then it ain't landing back in my lap.
There is nothing wrong with 4mm plywood providing the subfloor is suitable for it. Infact the subfloor for 4 and 6mm need to be at the same standard. If its not good enough for 4mm its not good enough for 6 mm either. The product on top is irrelevant .
Nope. Karndean have no responsibility with warranty towards subfloor defects. They can also not blame a subfloor that is not as recommend for a failer of there product if it is actually not to blame.
:lol: 4mm is not liked as it actually follows the contours of the subfloor. If the subfloor is already flat but your installing due to floorboard joints etc then there is no problems. As for 6mm, it will hide cupped boards etc better but will still follow the floor if bad and is actually more prone to pop the pins out with movement. Problem with 4mm - 6mm plywood is that installers use it to mask poor subloors. The subfloors should be sanded first or you simply jump upto 12mm plywood but then you have height issues.
So many installers have had probs with the basic ply ie not enough surface area to anchor it down.I have the new theory that we should be using 9mm instead of 6mm for the extra few quid needed to justify the rolls royce of a better installation just walk on it to enhance acoustics etc(for me anyway).
