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Frequently asked questions

Can I use HardieBacker® cement backerboard outside?

No. HardieBacker® cement backerboard is not suitable for external use.

How much HardiePlank® cladding will I need and how can I do a rough estimate?

There are approximately two planks to the square metre. Measure the width and height, in metres, of each wall to be clad. Multiply the two dimensions together to give you the area in square metres of each wall and then multiply this total by two to give you the total number of planks for each wall. Add all your walls up and this will be a reasonable guide to how many planks you need to order.

Do I need to treat HardieBacker® cement backerboard before tiling onto it?

No, HardieBacker® cement backerboard is ready to tile once installed – just wipe the boards down with a damp cloth to remove any dust prior to tiling.

What is the correct fixing pattern for installing HardieBacker® 12mm cement backerboard?

Fix HardieBacker® cement backerboard sheets on walls with HardieBacker screws for wood or for metal (as the substrate dictates) on all supporting studs at 200mm vertical centres. Keep fixings 15mm from vertical edges and 50 mm up/down from horizontal edges.

How do I cut HardiePlank® cladding and how can I control the dust?

We sell a range of specialist tools designed to cut our products quickly, effectively and with a minimum of dust. The best are hand tools like the HardieGuillotine™ which is available from your distributor. Always use approved safety glasses and appropriate EN approved respiratory protection (PPE #2 or #3) for particulate hazards when working with HardiePlank® cladding and HardieTrim® NT3™.

What types of trim can be used with HardiePlank® cladding?

HardieTrim® NT3™ is the preferred trim material for use with HardiePlank cladding. HardieTrim® NT3™ has the durability and paint holding characteristics to match the proven performance of HardiePlank cladding. Other trim materials may be used; however some of these may need a more intensive maintenance program.

Why is HardieFloor® and HardieFloor dB® made in a sheet size of 500mm?

HardieFloor® and HardieFloor dB® has a size of 500mm to cut down on weight, making it easier to carry. The critical dimension of the board is the length of 2400mm.

What types of trim can be used with HardieLinea® cladding?

HardieLinea Accent Trim is the preferred trim material for use with HardieLinea cladding. HardieLinea Accent Trim has the durability and paint holding characteristics to match the proven performance of HardieLinea cladding. James Hardie also produce range of metal profiles – see our catalogue for the complete range.

In which sizes is the James Hardie saw blade available?

James Hardie saw blade is available in 160, 190, 254 and 305 mm.

The 160 blades have 20 mm bore with a reducer taking it to 16 mm.
The 190 blades have 30 mm bore with a reducer taking it to 20 mm.
On the 254 and 305 mm blades they have a 30 mm bore and no reducer.

Can I paint HardieBacker® cement backerboard?

Yes, HardieBacker® cement backerboard is suitable for a wide range of paint coatings. We do however recommend that you plaster the board first, to ensure the best possible finish.

Where can I get a HardieBacker® score and snap knife?

Your local HardieBacker® cement backerboard stockist can provide you with a HardieBacker® score and snap knife. Please check the find your supplier tool on our website to find the supplier nearest to you.

What is HardieBacker® cement backerboard made of?

It is made of 90 % Portland cement and ground sand, 10% cellulose and selective additives. It contains no asbestos, formaldehyde, gypsum or glass fibre.

Do I need to pre-drill HardiePanel® cladding before fixing?

No. Most nails or JH colour matched screws can be used without pre-drilling.

How do I cut HardieBacker® cement backerboard?

HardieBacker® cement backerboard should be cut using HardieBacker® score and snap knife, available from your HardieBacker® cement backerboard stockist.

How do I clean my HardiePlank® facade?

HardiePlank cladding can be cleaned with cold or lukewarm water, if necessary with the addition of a mild household cleaning agent not containing solvents. Always start from the top with well-defined areas. Rinse with plenty of clean water until the facade is perfectly clean. Before cleaning full scale, it is recommended to test the chosen cleaning method on a smaller area to make sure it is likely to be successful. The cladding should be cleaned a minimum of once a year.

Can HardieBacker® EZ Grid™ 6mm be used in a shower wall application?

Yes. HardieBacker 6mm can be used on masonry or stud walls. If used on a stud wall, the perimeters of all boards must be fully supported, this may require the installation of additional horizontal noggins.

How do I install vinyl tiles on the grid side of HardieBacker® board?

Use a compatible self-leveling compound, something like Ardex – Arditex NA.
Apply a primer coat first of Ardex P51 diluted 1:3 with water. Then an approx. 3 mm coat of the Arditex NA.
Please always refer to the suppliers installation guides and best practice.

Can I install HardieBacker® EZ Grid™ 6mm on the wall?

Yes. However If you are installing HardieBacker® EZ Grid™ 6mm on the wall, you must ensure that all the edges of all boards are fully supported on battens, studwork or cross noggins. This will increase the supporting structure significantly, but is necessary if the product is to perform correctly.

Which should I use, HardieBacker® EZ Grid™ 6mm cement backerboard or HardieBacker® 12mm cement backerboard?

HardieBacker 6mm is used on floors as it decreases the transition to other surfaces. It can also be used on masonry walls, or on a stud wall. When placed on a stud wall, an extra noggin is required. HardieBacker 12mm cement backerboard is ideal for using on stud walls and provides enhanced impact resistance. It can also be used on the floor if addition height build up is required. Both products hold up to 100kg m/2 of tile, so either or is appropriate for heavy tile.

Can HardieBacker® cement backerboard be used in wet areas?

Yes, HardieBacker® cement backerboard is the ideal product to install in wet areas as it is water and mould resistant. The boards won’t rot, expand or contract like plywood and plasterboard.

Can I install HardieBacker® cement backerboard over linoleum or vinyl composite tile?

Yes, while it is better to remove all existing floor coverings and fix the HardieBacker® board direct to the substrate, HardieBacker® cement backerboard can be installed over linoleum or vinyl composite tile. James Hardie does not recommend you install HardieBacker® cement backerboard over cushioned vinyl but the boards may be installed over vinyl composite tile. Follow HardieBacker® cement backerboard floor installation instructions for complete details.

Where can I buy HardieBacker® cement backerboard?

HardieBacker® cement backerboard is available from most leading builders merchants and tile shops. Please check the ‘Dealer Locator‘ tool to find the supplier nearest to you. If you have any difficulties obtaining the product please contact our UK Customer Service department on 0800 068 3103.

Can I use HardieBacker® cement backerboard to build up the level of a concrete floor?

No. The primary function of HardieBacker® cement board is to provide a water resistant flat surface to tile on, it is not designed for use over concrete.

Do I need to protect the floor from the weather during the build?

No, the HardieFloor range is weather resistant and can be left exposed to the elements for up to 90 days.

Can I install electric floor heating mats onto HardieFloor®?

Yes, you can in accordance with the heating manufacturers installation instructions.

Is HardieFloor® suitable for use with wet under floor heating?

Yes, due to its unique properties, HardieFloor® will not swell or buckle due to the temperature changes occurring when the under floor heating is in operation. Its thermal conductance properties mean your heating system will react faster and conduct more heat to warming the room.

Can I use HardieBacker® cement backerboard in conjunction with under floor heating?

Yes, HardieBacker® cement backerboard is suitable for under floor heating. It should always be placed between the structural timber floor and the heating element. Never place heating under HardieBacker cement backerboard as there is a risk of damaging the system when fixing down the backerboard.

Is HardieFloor® structural flooring compatible with under floor heating?

Yes, HardieFloor® boards can be used in conjunction with both wet and electric systems.

How do I join HardieFloor® to tongue and groove jointed wood based floor sheets at the boundary to the wet area?

In accordance with the wood sheet manufacturers installation instructions, in most cases this will involve gluing the joints with the manufacturers recommended adhesive.

Is HardieFloor® compatible with engineered timber flooring?

Yes. In general engineered flooring can be bonded to the HardieFloor boards and although we haven’t officially tested at our end Wakol/Lecol adhesive has been used on numerous projects with great success. Please check together with the manufaturer of the timber flooring, what would be the most suitable adhesive and best practise.

How do I cut HardiePanel® cladding?

Straight cuts: we recommend using a James Hardie saw blade for use with circular saws. Curved cuts or pipe cut outs: a Jig Saw fitted with a TC (tungsten carbide) tipped blade. Typical reference numbers for these are Bosch T141 and Hitachi JA10. It is possible to cut the board with hard point hand saws but they will become blunt very quickly. Under no circumstances should the product be cut with high speed continuous tools like hand grinders or disc cutters. In all cases cut the panels with the face side up.

Can HardiePlank® cladding be installed vertically?

Yes, you can install the HardiePlank® planks in two manners.

1. Hit & Miss cladding: Overlap the planks by at least 30 mm.
2. Open butt jointed: Please cover all battens with EPDM.

How much do I need to overlap HardiePlank® cladding?

Planks should be overlapped 30mm leaving a visible margin of 150mm.

Do I still need to tank a wetroom using HardieFloor® flooring?

Yes, the floor should be waterproofed using a suitable waterproofing system up to 1 metre from the shower former.

How much do I need to overlap HardieLinea® cladding?

Planks should be overlapped 30mm leaving a visible margin of 180mm.

How close to the ground can I install HardiePlank®, HardieLinea® cladding and HardiePanel® panel?

A clearance of 150 mm should be maintained between the bottom edge of the lowest layer of HardiePlank®, HardieLinea® cladding and HardiePanel® panel and any unpaved ground. This will allow for clearance when soil is back-filled against the foundations and footings and prevent the bottom plank being damaged by contact with soil and rainwater splashing up the wall.

Do I have to butt the joints of HardiePlank® cladding? Will water get through the gap? Do I have to seal with mastic?

Planks should be butt jointed over a batten. Do not joint planks between battens as this could lead to failure of the product. Some rainwater may penetrate the butt joint, and whilst this is not a problem in itself as the system operates as an unsealed rain screen, it is good building practice to provide protection to the batten reducing the risk of the batten rotting over time. This can be easily achieved by fixing a small piece of EPDM tape on the batten at the point where the boards will but each other (see installation guide for details). Alternatively a small bead of transparent general mastic placed at the line of the joint will perform a similar function. Any excess should be wiped off the face of the plank immediately.

What nailing techniques can be used to install HardiePlank® cladding?

You can use impulse or pneumatic nail guns as well as nailing by hand. Nails should be placed 20-25mm down from the top edge of each plank and driven into the batten with the heads flush with the surface of the plank.

What nailing techniques can be used to install HardieLinea® cladding?

You can use impulse or pneumatic nail guns as well as nailing by hand. Nails should be placed on the nailing line embossed on each plank and driven into the batten with the heads flush with the surface of the plank.

How can I repaint HardiePlank® planks and HardieTrim® NT3™ profiles?

Specification for repainting HardiePlank® planks and HardieTrim® NT3™ profiles:

1. Abrade entire area with a Scotch Brite pad or similar (not sandpaper) to flat off the shine on the existing planks and trims. It is not necessary to abrade off the existing paint, just the shine to provide a key.
2. Wash down the elevations using a garden hose from top to bottom to remove all traces of atmospheric dirt, loose paint and dust. Do not use a pressure washer as this may damage the ColorPlus® coating
3. Allow to dry thoroughly. This will depend upon the weather conditions, but often a minimum of 24 hours.
4. Apply one coat of paint with a brush along the long face of the product taking care to brush the paint well into the surface. Do not overload the brush or allow the paint to run. Do not try to cover the existing color in one coat. Paint must be applied when the weather is dry and the air temperature is above 5°C and will remain so for the rest of the day. Paint coverage is approx. 10m²/litre per coat.
5. Allow the first coat to dry for 2-3 hours (2 hours min; 4 hours max).
6. Apply second coat of paint as above before the first coat is fully cured. Note: This point is very important as the paint performance is dependent upon film weight. The two coats have to bond to each other and so the first coat must not be fully cured when the second coat is applied. It is better to do one area at a time completely rather than the whole thing one day and the second coat the next.
Any self-applied coating is not covered by our warranty.

Can I use James Hardie® Edge Coating to repaint my HardiePlank® and HardieLinea® facade?

You can use James Hardie® Edge Coating to repaint your facade only, if you apply it according to our repainting instructions.

What type of paint can I use to paint HardiePlank®, HardieLinea® and HardiePanel® planks and panels?

You can use any good quality external grade acrylic paint (water based) to paint HardiePlank® , HardieLinea® and HardiePanel® planks and panels. Please refer to our painting instructions and to the specific instructions given by the paint manufacturer.

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Documents

Documents (146)

HardieBacker Installation Guide

Last updated: 25 April 2017

HardieFloor Brochure

Last updated: 25 April 2017

HardiePanel Brochure

Last updated: 25 April 2017

HardiePlank Brochure

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HardiePlank Installation Guide

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HardieBacker Specification Brochure

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HardieBacker and HardieFloor Warranty

Last updated: 25 April 2017

HardieFloor Acoustic Products Info

Last updated: 25 April 2017

HardieFloor dB Installation Guide

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HardieFloor Installation Guide

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HardieLinea Brochure

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HardieLinea Installation Guide

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HardieLinea on Masonry 90 Deg External Corner HardieLinea Accent Trim

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HardieLinea on Masonry 90 Deg External Corner Metal Trim

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HardieLinea on Masonry 90 Deg Internal Corner HardieLinea Accent Trim

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HardieLinea on Masonry 90 Deg Internal Corner Metal Trim

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HardieLinea on Masonry Abutment to Brick

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HardieLinea on Masonry Eaves

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HardieLinea on Masonry Expansion Gap

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HardieLinea on Masonry Gable v1

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HardieLinea on Masonry Gable v2

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HardieLinea on Masonry Ground Level

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HardieLinea on Masonry Parapet

Last updated: 25 April 2017

HardieLinea on Masonry Vertical Joint Plan View

Last updated: 25 April 2017

HardieLinea on Masonry Window Cill with HardieLinea Accent Trim

Last updated: 25 April 2017

HardieLinea on Masonry Window Cill without HardieLinea Accent Trim

Last updated: 25 April 2017

HardieLinea on Masonry Window Head without HardieLinea Accent Trim

Last updated: 25 April 2017

HardieLinea on Masonry Window Reveal with HardieLinea Accent Trim

Last updated: 25 April 2017

HardieLinea on Masonry Window Reveal without HardieLinea Accent Trim

Last updated: 25 April 2017

HardiePanel Installation Guide

Last updated: 25 April 2017

HardiePanel on Masonry 90 Deg External Corner with Metal Trim

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HardiePanel on Masonry 90 Deg External Corner

Last updated: 25 April 2017

HardiePanel on Masonry 90 Deg Internal Corner

Last updated: 25 April 2017

HardiePanel on Masonry Expansion Joint v1

Last updated: 25 April 2017

HardiePanel on Masonry Expansion Joint v2

Last updated: 25 April 2017

HardiePanel on Masonry General Arrangement

Last updated: 25 April 2017

HardiePanel on Masonry Ground Level

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HardiePanel on Masonry Horizontal Joint with Zed Profile

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HardiePanel on Masonry Nvelope NV1 System 90 Deg External Corner with Metal Trim

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV1 System 90 Deg External Corner

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV1 System General Arrangement

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV1 System Intermediate fixing

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV1 System Joint fixing

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HardiePanel on Masonry Nvelope NV1 System Soffit and Fascia

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV6 System 90 Deg External Corner with Metal Trim

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV6 System 90 Deg External Corner

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV6 System General Arrangement

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV6 System Intermediate fixing

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV6 System Joint fixing

Last updated: 25 April 2017

HardiePanel on Masonry Nvelope NV6 System Soffit and Fascia

Last updated: 25 April 2017

HardiePanel on Masonry Parapet

Last updated: 25 April 2017

HardiePanel on Masonry Soffit and Fascia

Last updated: 25 April 2017

HardiePanel on Masonry Vertical Joint

Last updated: 25 April 2017

HardiePanel on Masonry Window Cill

Last updated: 25 April 2017

HardiePanel on Masonry Window Head

Last updated: 25 April 2017

HardiePanel on Masonry Window Reveal

Last updated: 25 April 2017

HardiePlank on Masonry 135 Deg Ext Mitre HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry 135 Deg Int Mitre HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry 90 Deg External Corner HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry 90 Deg External Corner Metal Trim

Last updated: 25 April 2017

HardiePlank on Masonry 90 Deg Internal Corner HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry 90 Deg Internal Corner Metal Trim

Last updated: 25 April 2017

HardiePlank on Masonry Abutment Internal

Last updated: 25 April 2017

HardiePlank on Masonry Abutment to Facing Brick HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry Abutment to Render Options

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HardiePlank on Masonry Below Render

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HardiePlank on Masonry Brick Dado

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HardiePlank on Masonry Cladding Gable v1

Last updated: 25 April 2017

HardiePlank on Masonry Cladding Gable v2

Last updated: 25 April 2017

HardiePlank on Masonry Eaves

Last updated: 25 April 2017

HardiePlank on Masonry Expansion Gap v1

Last updated: 25 April 2017

HardiePlank on Masonry Expansion Gap v2

Last updated: 25 April 2017

HardiePlank on Masonry Ground Level

Last updated: 25 April 2017

HardiePlank on Masonry Using HardieClip

Last updated: 25 April 2017

HardiePlank on Masonry Vertical Cladding Base Ventilation-2

Last updated: 25 April 2017

HardiePlank on Masonry Vertical Cladding Base Ventilation

Last updated: 25 April 2017

HardiePlank on Masonry Vertical Cladding External Corner HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry Vertical Cladding External Corner MetalTrim

Last updated: 25 April 2017

HardiePlank on Masonry Vertical Cladding Open Butt Jointed

Last updated: 25 April 2017

HardiePlank on Masonry Vertical Cladding Overlapped

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HardiePlank on Masonry Vertical Cladding Top Ventilation

Last updated: 25 April 2017

HardiePlank on Masonry Window Cill with HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry Window Cill without HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry Window Head with HardiePlank

Last updated: 25 April 2017

HardiePlank on Masonry Window Head with HardieTrim NT3

Last updated: 25 April 2017

HardiePlank on Masonry Window Reveal HardiePlank on Edge

Last updated: 25 April 2017

HardiePlank on Masonry Window Reveal HardieTrim NT3 and HardiePlank

Last updated: 25 April 2017

HardiePlank on Masonry Window Reveal HardieTrim NT3 on Edge

Last updated: 25 April 2017

HardiePlank on Masonry Window Reveal HardieTrim NT3 only

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HardiePlank on Masonry Window Reveal Metal Trim

Last updated: 25 April 2017

HardiePlank on Masonry Window Reveal no Trim

Last updated: 25 April 2017

HardiePlank on Masonry Window Revel HardieTrim NT3 on Face

Last updated: 25 April 2017

HardiePlank Product Guide

Last updated: 25 April 2017

HardiePlank Vertical on Masonry - Expansion Joint

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Cladding products with ColorPlus Technology warranty information

Last updated: 25 April 2017

PrimePlus cladding products warranty information

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Best practice manual - working safely

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HardieFloor Wet Floor Areas and Underfloor Heating Overview

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MSDS HardieFloor

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MSDS JamesHardie

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HardieFloor Direct to Timber Floor Joist Overview

Last updated: 25 April 2017

HardieFloor General Installation Details Overview

Last updated: 25 April 2017

HardieFloor Direct to Timber Floor Joist

Last updated: 25 April 2017

HardieFloor Double Brick Wall and Timber Floor I-Joist

Last updated: 25 April 2017

HardieFloor Double Brick Wall and Solid Timber Floor Joist

Last updated: 25 April 2017

HardieFloor Direct to Timber Floor Joist Overview

Last updated: 25 April 2017

HardieFloor Double Brick Wall and Timber Floor I-Joist

Last updated: 25 April 2017

HardieFloor Timber Framed Wall and Timber Floor I-Joist

Last updated: 25 April 2017

HardieFloor Timber Framed Wall and Solid Timber Floor Joist

Last updated: 25 April 2017

HardieFloor Direct to Timber Floor Joist Overview

Last updated: 25 April 2017

HardieFloor Double Brick Wall and Timber Floor I-Joist

Last updated: 25 April 2017

HardieFloor Timber Framed Wall and Solid Timber Floor Joist

Last updated: 25 April 2017

Testimonial Norstone - HardieBacker

Last updated: 25 April 2017

Testimonial Shifnal Golf Club - HardieBacker

Last updated: 25 April 2017

Testimonial Owlswood - HardieLinea

Last updated: 25 April 2017

Testimonial Buda Developments - HardiePlank

Last updated: 25 April 2017

Testimonial - Bury St Edmonds - HardiePlank

Last updated: 25 April 2017

Testimonial Chessington - HardiePlank

Last updated: 25 April 2017

Testimonial Rollercoaster House - HardiePlank

Last updated: 25 April 2017

Testimonial The Echoes - HardiePlank

Last updated: 25 April 2017

Testimonial Walton on the Naze - HardiePlank

Last updated: 25 April 2017

UK HardieBacker BBA Certificate 04-4100 130916

Last updated: 25 April 2017

UK HardieFloor BBA Certificate 13-5057 031013

Last updated: 25 April 2017

UK HardieLinea BBA Certificate 13-4981 160413

Last updated: 25 April 2017

UK HardiePanel BBA Certificate 05-4248 290515

Last updated: 25 April 2017

UK HardiePanel Soffit BBA Certificate 05-4248 290515

Last updated: 25 April 2017

UK HardiePlank BBA Certificate 04-4147 030615

Last updated: 25 April 2017

HardieFloor Double Brick Wall and Solid Timber Floor Joist 

Last updated: 25 April 2017

HardieFloor Timber Framed Wall and Timber Floor I-Joist 

Last updated: 25 April 2017

HardieFloor Direct over Concrete Floor Slab Overview

Last updated: 25 April 2017

HardieFloor Timber Framed Wall and Solid Timber Floor Joist

Last updated: 25 April 2017

HardieFloor Over Concrete Floor Slab

Last updated: 25 April 2017

HardieFloor Double Brick Wall and Solid Timber Floor Joist

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HardieFloor Timber Framed Wall and Timber Floor I-Joist

Last updated: 25 April 2017

EU ISO 14001 Certificate Peru 2015

Last updated: 25 April 2017

EU ISO 14001 Certificate Pulaski 2015

Last updated: 25 April 2017

EU ISO 14001 Certificate Reno 2015

Last updated: 25 April 2017

EU Declaration of Performance HardieBacker 12mm 2016

Last updated: 25 April 2017

EU Declaration of Performance HardieBacker 6mm 2016

Last updated: 25 April 2017

EU Declaration of Performance HardieFloor 19mm 2016

Last updated: 25 April 2017

EU Declaration of Performance HardieFloor 22mm 2016

Last updated: 25 April 2017

EU Declaration of Performance HardieLinea 2016

Last updated: 25 April 2017

EU Declaration of Performance HardieLinea Accent Trim 2016

Last updated: 25 April 2017

EU Declaration of Performance HardiePanel 2016

Last updated: 25 April 2017

EU Declaration of Performance HardiePlank 2016

Last updated: 25 April 2017

EU Declaration of Performance HardieTrim NT3 2016

Last updated: 25 April 2017