Hardiebacker Vs No More Ply Nmp

[hmtiling]

The fact that NMP states that it only ''expands slightly'' and that ''8 screws per board is usually sufficient'' is enough to be some concern to me.
''expands slightly'' means on cupped floorboards the board is not 100% supported,
''8 screws per board is usually sufficient'' means 8 screws might be enough,it might be 10 or if your a real cheapskate you might be able to get away with 6!

I use 12 on every full board.

 

[widler]

I use both, ive used the nmp glue once, but i just spread with addy now, it does seem to solidify the floor a lot better, i like hardi much better,im same as bri i like the grid on the hardi compared to the smoothness ofthe nmp

 

[SJPurdy]

This is what their installation manual says
View attachment 77897

The mega strength adhesive is for fixing to wood floors, the SPFlex is for over-boarding concrete floors (after priming the back of the NMP boards!!) according to my instruction sheet.

The NMP screws are to hold the board down while the adhesive sets, not to hold the board in place so the number is less critical (but 8 in a board of NMP is a lot easier than 35 (which are the fixings) in the equivalent size Hardie).

Personally i'd only consider using the NMP on a flat timber floor where all the board is supported and the mega strength addy will fix it down - I don't think it is appropriate if there is any cupping of t and g boards that needs to be filled to get a solid bed (Hardie is much better, fixed over cement based addy, in this case). For me Hardie is also easier to obtain and cheaper so I hav't used NMP for a long time.

As for the comparable amounts of dust, I do not know but the warnings on the Hardie put me off using it for a while. As with any dust avoid it! Use a good dust mask, they are cheap when compared with years spluttering to a slow death!

 

[Ash-wolves]

My supplier stocks NMP, I've used it for about 6 years with no problems (always followed MI)

Cuts easy with a hand saw or by using the NMP knife, their glue is horrible if you get it on your hands ( so approach with caution!)

Although I met with the hardie rep at a dreaded TT trade show, they've a new product out soon, which fixes direct to joists so you can scrap any rotted & damaged floor boards, I'm a not in a hurry to use it tho!

 

[Dave]

My supplier stocks NMP, I've used it for about 6 years with no problems (always followed MI)

Cuts easy with a hand saw or by using the NMP knife, their glue is horrible if you get it on your hands ( so approach with caution!)

Although I met with the hardie rep at a dreaded TT trade show, they've a new product out soon, which fixes direct to joists so you can scrap any rotted & damaged floor boards, I'm a not in a hurry to use it tho!

It's been out a while , seen it on a wet ufh job about a Month back.

 

[Rosco100]

Used NMP for years and no problems, used it on 3m2 floors up to 75m2