HardieBacker...

Good evening all. A little bit of info on HardieBacker board, I got a new key board today and wanted to try it out so if there any any spelling mistakes that will be why. Anyway hope this is helpful to a few people.



How to install HardieBacker 250 cement board

Foundation
Ensure floor satisfies requirements of local building regs and does not deflect more than 3mm over 400mm. Excessive flex may cause tiled floor to crack.

Preparing the substrate
Check tha the floor is suitable for use. Repair or replace any loose, warped or damaged parts of the sub-floor. Clean the floor with a brush to remove any site dust to promote adhesion of the tile adhesive bed.

Step 1. Preparing the bed for the HardieBacker
HardieBacker 250 cement board is bedded into a tile adhesive compound. The tile adhesive levels out any minor deviations to allow for a well supported even tile backer substrate. Spread the tile adhesive across the floor with a 6mm notched trowel. Make sure that only enough tile adhesive is spread out for a sheet at a time. Applying too much adhesive may result in the adhesive drying to fast.

Step 2. Installing the first sheet
Sheets must be laid with a 3mm gap from all walls, vanities, baths ect. Sheets are then pressed into the bed of tile adhesive. Install with EZ-grid face up. Note: The adhesive is used as a gap filler only and is not required to attach HardieBacker to the sub-base - this is carried out by the application of the mechanical fixings.

Step 3. Fixing sheets
Sheets are nailed through the body of the board (there are marker guides on the EZ grid to help you) and around the perimeter at 200mm centres. Fixing 15mm from the edges and 50mm from corners of sheets. Fixings can be either 30mm galvanised roof nails or HardieBacker screws.

Step 4. Subsequent sheets
Subsequent sheets are fixed in the same method. Remember to lay the sheets brocken bond or brick patters.

Step 5. Preparing the joint sheets
Wipe down boards with a damp sponge to remove site dust.

Step 6. Sheet jointing and taping
The joints are then reinforced to provide a more consistant substrate. Aplly the tile adhesive to joints of HardiBacker with a spatula then enbed 50mm alkaline resistant tape into the tile adhesive.

Step 7. Finishing joint
Apply a final layer of tile adhesive feathering joint out to a width of approximately 150mm. Ensure there is no obvious ridge of adhesive as this may affect the final tile finish.

Step 8. Ready for tiling
Install tiles

How to install HardieBacker 500 cement board

Foundation
Ensure wall framing is straight. HardieBacker will not correct un-even stud walls. James Hardie recommends a maximum of 3mm to 4mm deviation. Framing should be at no more than 400mm centers.

Step 1 Fixing sheets
Sheets are nailed to each stud at 200mm centers. Fixings are 15mm from edges and 50mm from the corner of sheets. Fixings for timber studs can be either Hardi screws or 30mm galvanised roofing nails. Install smooth side up.

Step 2 Subsequent sheets - layout
A quick tip may be to use the off cut from the last board on a wall to begin the next sheeting of boards.

Step 3. Preparing to joint sheets
Wipe down boards with a damp sponge to remove site dust.

Step 4 Sheet jointing and taping
The joints are then jointed and reiforced to provide a more consistant substrate. Apply tile adhesive to joints with a spatula then embed 50mm alkaline resistant FibaTape into tile adhesive.

Step 5 Finishing joint
Apply a final layer of tile adhesive feathering joint out to a width of approximately 150mm. Ensure there is no obvious ridge of adhesive as this may affect the final tile finish.

Step 6. Finishing wall and floor details
Fill joints between floors and walls with a hight quality wet area silicone sealant.

Step 7. Ready for tiling
Install tiles.


Floors and adjoining walls
Sheets should be 6mm above the finished floor surface to allow for any setting of the frame or movement. Sheets should also have a 6mm gap from sheet face to adjacent walls and from floor level to allow for movement.

Araes exposed to water
When HardieBacker boards are installed behind showers you will need to install a PE membrane sheet to assist in the prevention of water ingress. Corners of walls should also be flashed wil a PE flashing or similar.

Cutting the sheets - score and snap
Sheets are easily cut using a score and snap knife. HarieBacker 250 boards are are scored about 3 times to create a groove of 1.5-2mm, the board is then pressed upwards snapping the board at the score and snap line. HardieBacker 500 boards are scored about 6 times to create a groove of 3-4mm, the board is then snapped up wards at the score and snap line.

another great post

Great post mate

1. OVERVIEW
This document is an addition to the James Hardie®
HardieBacker250® Fixing Guide. The recommendation
contained in this document addresses the fixing
recommendations of HardieBacker250® cement board to
masonry walls. HardieBacker250® cement board is simply
adhered to the masonry walls using tile adhesive with masonry
anchors. This recommendation is intended for use in
residential and light commercial buildings. Maximum load
carrying weight is 45 kg / m2.
2. COMPOSITION
HardieBacker250® cement board is made from Portland
cement, ground sand, cellulose, water and selected additives.
The boards contain no asbestos, formaldehyde, gypsum or
glass fibre.
3. ASSOCIATED PRODUCTS
1. MASONRY ANCHORS
Use Ř 6mm x 50 mm masonry anchors with self embedding
head. Do not overdrive head of anchor, it must be flush with
face of HardieBacker250® cement board. The screw should
have adequate provision for corrosion resistance.
Figure 1.
2. TILE ADHESIVE
Use tile adhesive that complies with BS EN 13888:2002 or
preferably BS 5980:1980, type 1, 2 or 3. Adhesives for use
with ceramic tiles and mosaics. Contact tile adhesive
manufacturer for suitability and any preparation required by
manufacturer.
At minimum; the rear of HardieBacker250® cement board and
the masonry wall must be wiped down to remove all dust.
4. INSTALLATION ON MASONRY WALLS
Ensure wall is sound, clean and ready to receive
HardieBacker250® cement board.
Adhere HardieBacker250® cement board to the masonry
walling using tile adhesive. Apply tile adhesive to masonry
walls using a 6mm notched trowel. The tile adhesive must fully
support HardieBacker250® cement board and the
HardieBacker250® cement board is firmly pressed into the tile
adhesive. The masonry anchors are immediately fixed through
the board into the masonry walls holding the sheeting in place.
Refer figure 1 for details.
Note: Do not dot and dab tile adhesive.

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5. INSTALLATION AND DRY LINING
Where it is practical, all existing old dry lining should be
removed as it has potential to fail further. Where it’s not
feasible, you can install HardieBacker250® cement board on
existing gypsum boards. Follow the standard Fixing Guide, but
use countersunk stainless steel/brass screws 50 mm long and
8-10 mm diameter head to attach HardieBacker® cement
boards directly through the plasterboard to the wooden studs
behind. The fixings should be as per the normal
HardieBacker® 500 centres, in other words 400mm across
and 200mm up. Please note: The use of adhesive to fix
HardieBacker® cement board to plasterboard on its own
without mechanical fixings is not recommended or warranted.
6. FURTHER INFORMATION

For further information please contact James Hardie at
info.europe@jameshardie.com , or refer to current James
Hardie® Fixing Guide for complete installations on installing
HardieBacker® Cement Board.

Cutting instructions.

Outdoors
1. Position cutting station so that wind will blow dust away from user or
others in working area.
2. Use one of the following methods based on the required cutting rate:
Best
Score and Snap
Shears (Pneumatic or Handheld)
Better
Dust reducing circular saw equipped with HardieBlade® saw blade and
HEPA vacuum extraction
Good
Dust reducing circular saw with HardieBlade® saw blade


Indoors
• Cut only using score and snap, or shears (manual,
electronic or pneumatic).
• Position cutting station in a well ventilated are

Ta Dave