hi my 1st post , im doing a 100%refit on my bathroom

all plaster is off ,all lath and plaster is off,its all being re tiled ok

a shower bath is going in ,this is where the bare brickwork is ,250 hardiebacker is going direct to wall /adhesive and screwed


the remaining walls all studwork i intend to use the 12mm moisture resistant plasterboards

the floorboards are up ,18mm ply going down 250 hardiebacker on top of this ,ahdesive and screwed

does this sound ok ??

im not doing the tiling !!!
horses for courses ,me thinks

Sounds good to me Biffo

Originally Posted by biffo17

hi my 1st post , im doing a 100%refit on my bathroom

all plaster is off ,all lath and plaster is off,its all being re tiled ok

a shower bath is going in ,this is where the bare brickwork is ,250 hardiebacker is going direct to wall /adhesive and screwed


the remaining walls all studwork i intend to use the 12mm moisture resistant plasterboards

the floorboards are up ,18mm ply going down 250 hardiebacker on top of this ,ahdesive and screwed

does this sound ok ??

im not doing the tiling !!!
horses for courses ,me thinks

I'd use the 500, (12.5 mm as opposed to 6mm) or even 12.5 mm plasterboard (dot and dabbed) with a tanking membrane.

Doug, you beat me to it. I must get quicker on my keyboard

so h/b 500 0n the walls , why tanking ?? better option ??

i was gong to use 500 on the floor but it would raise the threshold too much

thanks for quick replies

As per Doug and Ken, Hardie 250 is not specified for use on walls.

ok mate thanks 250 ok on the floor ??

Originally Posted by biffo17

so h/b 500 0n the walls , why tanking ?? better option ??

i was gong to use 500 on the floor but it would raise the threshold too much

thanks for quick replies

water will pass through hd, but will not affect it. If it's tanked water won't even get to your substrate

Could have sworn 250 was 12.5mm I just always say 6 or 12.5mm when ordering

so i could just dab 12mm p/b ( forget backer board)and tank it . better job costs about the same

Originally Posted by biffo17

so i could just dab 12mm p/b ( forget backer board)and tank it . better job costs about the same

yes, altho' plasterboard won't hold as much weight as hardie/cement based boards

the area is approx 2000mm x 2000mm

origionally i had 2 mirrors 2000mmx2000mm /1000mm x 2000 sat in a frame silcone jointed

all was bone dry when i removed them !!

it's the tile weight I ws referring to biffo, do you know the weight, (per m2) of your tiles?

not yet doug er indoors not decided YET !!!!

ill know tomorrow thanks again

Originally Posted by biffo17

not yet doug er indoors not decided YET !!!!

ill know tomorrow thanks again

here's the weight bearing guide for you biffo (courtesy of Oli's bible)


Substrate weight ratings

A common question, how much weight can my wall support, here are the reccommended max weight ratings in KG / m2

Plaster Skim on Plaster Board........20KG
Skim and Set Plaster...................28KG
Plaster Board.............................32KG
Sand and Cement.......................40KG
Cement Backer Board..................55KG
Hardibacker Board.......................45KG
Lightweight Tile Backer Board........40KG
Glass Reinforced Cement Sheet.....50KG
Gypsum Fibre Board.....................40KG

Remeber to factor in the weight of the tile / m2 AND adhesive and grout

Grout.........2KG / m2
Adhesive....4KG / m2

ok thanks for that

was told friday 4/6 weeks for delivery of bath suite just had call to say its coming on friday !!!!!!!

the house is full !! already with gear

better get cracking then to make room

Originally Posted by Captain Slow

As per Doug and Ken, Hardie 250 is not specified for use on walls.

Yes it is.. but only fixed with adhesive to a flat wall.. not stud work etc.

hi , ive had to stud the wall out ,it was too rough to adhere the board ,

as i cannot find the true height of the new bath,ive left the bottom stud 10mm off the old bath should be ok

plumbers let me down suprise suprise !!!!

what screws for the hb floor ??

Originally Posted by Dave

Yes it is.. but only fixed with adhesive to a flat wall.. not stud work etc.

Just in case anybody does read this and require info on hardi 250 installation to brick walls etc, then here is the installation instructions..


HardieBacker EN installation 200810 masonry walls.pdf

Originally Posted by biffo17

what screws for the hb floor ??

hb supply screws I think, but my local supplier don't stock them, so I normally use 25mm spax screws

ok shower area almos done ,electrics 1st fix tomorrow

im going to use the shluler ditra on the floor on top of 20mm ply anyone know of a supplier in the midlands area ?? birmingham prefably ??? thanks

Sir Ramic would be the man to name a supplier for you biffo.

ok ordered the ditra £32 for 4 M2 what adhesive to put it down with ??

also if anyone can help ive a semi pedistal basin in 2 parts 4 holes 4 ragbolts ( masonry fixings )supplied .
im going onto a stud wall ,not boarded yet so i can stud it out . coachbolts ??? pre drilled ???

Use the masonry fixings without the plugs and pilot the holes into the timber. Most fishcer fisings are 8 or 10mm so i pilot around 5 to 7mm.

Make sure the timber behind them goes above and below the level of the basin to stop it pulling downand flexing the wall.

ill be putting full height hardwood studs ,ill struggle to get fishers in its tight up there

coachbolts and a socket ill see how it goes

Ask for basin fixing bolts at your merchants.They are usually fishers and have a coarse thread fro the wall and a 12m thread for the basin nuts and a nylon cammed washer.

Like these: Fischer WD 8x100 Wall Mounted Basin Fixing Kit - Screwfix.com, Where the Trade Buys