Thanks for letting me in....drinks are on me and any suggestions on this floor?

[redrex]

Hi everyone,

delighted to have been let in I feel all grown up now!

thought i would get your thoughts on this job that I started yesterday, I think the pictures say pretty much what the problem was. No expansion joint at all between the heated screed and ply, no expansion joint around the perimiter of the room under the skirting and the plyood hasn't been staggered and no gap left between them. The boards havn't been primed on the back side either. My solution is to straighten the edge of the screed so I can have a parallel line for the expansion joint-it is running about 10mm off from left to right, re-fit ply and stagger the joints leaving a nice expansion gap around the room. The problem is that I need a couple of extra mm on the ply floor (currently 18mm ply) as at best there was only 3-4mm coverage and I want to get it to 5mm plus. I will be using either BAL fastflex or similar. Oddly the heated screed does have 5mm plus so no issues there. Question is...will it be ok to use 15mm marine ply? The floor is coming up tomorrow to have a proper look. Assuming that the floor is strenghtened with noggins etc if needed and screwed at 30 mm centres will I be ok with this? the tiles are 450x450 5mm unglazed porc. There is a small amount of deflection when I jump up and down but not much and I am quite heavy(big boned:lol I was considereing hardi backer or no more ply but there are no floor boards under the ply, the ply is attached directly to the joists.

I appreciate that everyone is probably out at work...and I am off to sort out the screed now but I look forward to your thoughts later...

Cheer everyone!:8:

Ed

 

[grumpygrouter]

Why would you ply a heated screed?

 

[redrex]

Hi Grumpy,

I don't want to.....What I am looking at is using 15mm ply instead of the 18mm that is already there to give me extra depth for retiling. Half the room-to just past where the tiles are, is heated screed-the rest is ply on a timber frame. having pulled up the ply today it does look like the original intention was to screed the whole room (the UFH cables are all nicely layed out under the ply) but for whatever reason didn't. Anyway customer doesn't want me to do that just re-fit ply and tiles.

Ed

 

[doug boardley]

a sure fire case for ditra(or other uncoupling membrane) in my opinion:smilewinkgrin:

 

[White Room]

Hi everyone,

delighted to have been let in I feel all grown up now!

thought i would get your thoughts on this job that I started yesterday, I think the pictures say pretty much what the problem was. No expansion joint at all between the heated screed and ply, no expansion joint around the perimiter of the room under the skirting and the plyood hasn't been staggered and no gap left between them. The boards havn't been primed on the back side either. My solution is to straighten the edge of the screed so I can have a parallel line for the expansion joint-it is running about 10mm off from left to right, re-fit ply and stagger the joints leaving a nice expansion gap around the room. The problem is that I need a couple of extra mm on the ply floor (currently 18mm ply) as at best there was only 3-4mm coverage and I want to get it to 5mm plus. I will be using either BAL fastflex or similar. Oddly the heated screed does have 5mm plus so no issues there. Question is...will it be ok to use 15mm marine ply? The floor is coming up tomorrow to have a proper look. Assuming that the floor is strenghtened with noggins etc if needed and screwed at 30 mm centres will I be ok with this? the tiles are 450x450 5mm unglazed porc. There is a small amount of deflection when I jump up and down but not much and I am quite heavy(big boned:lol I was considereing hardi backer or no more ply but there are no floor boards under the ply, the ply is attached directly to the joists.

I appreciate that everyone is probably out at work...and I am off to sort out the screed now but I look forward to your thoughts later...

Cheer everyone!:8:

Ed

That quite an assumption to make

 

[DHTiling]

That quite an assumption to make

WHY!!..most peeps are out working during the day...:smilewinkgrin:

 

[andy-p]

WHY!!..most peeps are out working during the day...:smilewinkgrin:

ive got the feeling whitebeam thought he said out of work...

 

[White Room]

I read it as out off work, not at work:dizzy2:

 

[redrex]

Izz all cool whitebeam, I re-read it and thought ooooops, easy misunderstanding but if any one wants a row!!!! i will give you my girlfriends number:smilewinkgrin:

anyway, been at it all day today and was knackered yesterday so didnt post back. pulled up the ply...and it is supported by joists running left to right at 2ft intervals, intern supported by brick blocks-sort of floating but not quite-no noggins or perimiter frame. tomorrow I will put in noggins and frame.

more pics to follow

ps any one have any easy way to get ply up that has been screwed down rather than unscrewing every single screw:mad2:...takes forever...worst thing was I couldnt bash it or get out the circular saw as i didnt know exactly what was underneith and the saw didnt like the residual adhesive.

Ed