EsiBloc

EsiBloc
™
MORTARLESS MASONRY
CBI 3321/3323
November 2009
INTRODUCTION
THE EsiBloc™ ADVANTAGE
Firth EsiBloc™ Mortarless Masonry has been
specifically developed for commercial and industrial
applications to enable faster, simpler and more
cost-effective construction. EsiBloc™ delivers these
advantages without compromising any of the benefits
of conventional masonry construction: thermal mass,
excellent aesthetics, low maintenance, strength,
durability, noise reduction, fire resistance and
earthquake resistance.
masonry is factory calibrated to fine tolerances in
height, only minimal wedging is needed to maintain
correct levels. In conjunction with best practice end
propping, specially formulated moisture cure glue is
used between courses at wall ends, corners and Tjunctions to prevent blowouts caused by hydrostatic
pressure during grouting.
With EsiBloc™ there are no fiddly, expensive plastic
bridges. There are no delays due to the weather.
More speed and greater efficiencies revolutionise the
economics of masonry construction, delivering lower
costs and creating a competitive advantage for firms
building with EsiBloc™.
EsiBloc™ will help achieve shorter critical paths, more
completed projects and more satisfied customers,
without the need for additional people or resources.
EsiBloc™ can be rapidly dry stacked and grouted
with EsiBloc Fill™, without delay on the same day,
whatever the weather. It is a very simple construction
process. The blocks are laid course after course,
without needing any mortar. Because EsiBloc™
EsiBloc™ is a unique Firth proprietary masonry
product protected by copyright and New Zealand
Design Registration Number 406471.
Firth EsiBloc™ MORTARLESS MASONRY
The EsiBloc™ Mortarless Masonry family is comprised of just seven masonry units.
Open End
EB 20.03
0
Left-hand Corner
EB 20.15L
199
0
20
20
20
190
398
190
Bond Beam
Depressed Web
EB 20.16
398
200
0
Knock-in Half Bond
Beam Depressed Web
EB 20.14
0
0
20
398
398
200
Knock-in Half
Bond Beam
EB 20.44
20
190
Right-hand Corner
EB 20.15R
0
0
20
20
190
stacked quickly and accurately. Apart from laying the
Firth EsiBloc™ means quick and easy construction.
You will achieve shorter project completion times than
you would using conventional mortared masonry. Get
the EsiBloc™ advantage of faster construction, lower
total costs, and fewer penalties due to hold-ups.
first course of EsiBloc™ with mortar, to establish a
Speed and Efficiency
Mortarless masonry is widely used and is a recognised
construction technique in Europe and North America.
Firth has developed EsiBloc™ Mortarless Masonry
especially for New Zealand conditions. EsiBloc™ has
been tested extensively and proven to meet the exacting
standards required for construction in New Zealand.
Half
EB 20.02
Cost Effective
199
190
398
level starting point, the rest of the wall is constructed
without mortar.
Keeping each course of EsiBloc™ level and laid to a line
is essential. Firth provides simple wedges to adjust the
level where required, though the need for wedging is
EsiBloc™ is fast. Only the first course of EsiBloc™ is
mortared. The rest of the wall can be dry stacked,
reinforced, propped and grouted with EsiBloc Fill™, all
in one day. There is no need to clean out excess mortar
and there is less waste to remove from site.
minimal as each EsiBloc™ is precisely calibrated to a
EsiBloc™ achieves more with the same resources.
Use EsiBloc™ for faster, more cost-effective masonry
construction and a competitive advantage.
can keep on laying EsiBloc™ even when it rains. Less
Simplicity Itself
Masonry Construction
The EsiBloc™ masonry range comprises seven
standard blocks for construction of virtually any wall.
EsiBloc™ projects are easy to plan, easy to price,
and easy to construct. EsiBloc™ can be mixed and
matched, if necessary, with mortared blocks from the
Firth 20-Series masonry range.
EsiBloc™ combines the advantages of mortarless
Accurate
summer. Masonry buildings have excellent aesthetics;
EsiBloc™ Mortarless Masonry is factory calibrated
to exacting height tolerances so walls can be dry
windows and doors with deep reveals provide a strong
consistent height.
No Weather Delays
There should be no stoppages due to weather. You
dependence on the weather means more reliable
outcomes for you and your clients.
construction with all the benefits expected of
conventional masonry: noise reduction, fire resistance,
earthquake resistance, low maintenance, strength and
durability. The high thermal mass of masonry buildings
makes them easy to keep warm in winter and cool in
and permanent appearance.
DESIGN, SPECIFICATION AND INSTALLATION CONSIDERATIONS
COMPLIANCE WITH THE NEW ZEALAND BUILDING CODE
Specific design is required for buildings constructed
with EsiBloc™ Mortarless Masonry. The performance
and specific design methods for EsiBloc™ are the same
as for conventional mortared masonry construction.
Reference should be made to NZS4230 Design for
Masonry Structures.
Buildings constructed with EsiBloc™ Mortarless
Masonry, like all buildings constructed with masonry,
must meet the requirements of several clauses within
the New Zealand Building Code.
Construction with EsiBloc™ complies with existing
masonry Standards without alteration. EsiBloc™
can be used wherever conventional Firth 20-Series
masonry would be used. EsiBloc™ Mortarless Masonry
is always solid filled with EsiBloc Fill™. Construction
shall comply with NZS4210 Masonry Construction:
Materials and Workmanship.
• A
pplied weatherproofing membranes. These
systems typically include high build acrylics, bitumen
emulsions (if compatible with subsequent coatings),
or paint on cementitious coatings. As these systems
have limited rendering ability, a proprietary plaster
should be applied to fill the unmortared joints and
plaster the wall. Weatherproofing membranes are
normally applied in three coats or in accordance with
the manufacturer's specification.
• Cement plaster complying with NZS 4251:98 and
weatherproof coatings.
• EIFS systems, comprising of exterior insulation
(typically polystyrene) coated with a modified plaster
and weatherproof coating.
Noise Reduction
Strength
B2 Durability
Walls built with EsiBloc™ provide excellent sound
insulation, with a sound attenuation of STC55* (i.e.
a reduction in sound by 55dB) meeting the Standard
required for inter-tenancy walls.
EsiBloc™ is manufactured to a compressive strength
in accordance with NZS4210.
Because concrete masonry forms the structure of
the building it must be durable for a minimum of 50
years.
*Based on testing of Firth 20-Series masonry blocks at the
University of Auckland
Fire Resistance
EsiBloc™ performs in the same manner as conventional
masonry and provides a fire rating of 240/240/240*
(4 hours) when used in a wall.
*Based on New Zealand Concrete and Masonry Association
published performance for 20-Series block
Holmes Solutions Limited, a subsidiary of Holmes
Group Limited, confirms that tests show the overall
structural performance of an EsiBloc™ Mortarless
Masonry wall is similar to that expected for conventional
masonry walls.
19th September 2006
Firth Industries
Earthquake Resistance
Newmarket
Walls constructed with EsiBloc™ will perform to the
same level of earthquake resistance as those built
with conventional masonry. When designed to the
appropriate Standards, EsiBloc™ construction exceeds
New Zealand earthquake performance requirements.
To whom it may concern,
Care should be taken to select an appropriate
plastering system. Refer to the plaster manufacturer
for recommendations.
Weatherproofing
EsiBloc™ Mortarless Masonry should be coated to
ensure weatherproofing. The designer will typically
determine the appropriate solution based on
consideration of aesthetics, insulation, maintenance,
and consequences of minor breach of the system.
Some of the options for external weatherproofing
systems include:
All buildings constructed with EsiBloc™ should be
designed in accordance with NZS4230 (parts 1 & 2),
Design for Masonry Structures.
Timber and other methods of construction used in
conjunction with EsiBloc™ should comply with the
relevant Acceptable Solutions or Verification Methods.
Structural Performance
Private Bag 99904
Plastering
B1 Structure
AUCKLAND
STRUCTURAL PERFORMANCE OF WALLS UTILISING FIRTH MORTARLESS MASONRY
Holmes Solutions is a subsidiary of Holmes Group Limited, specializing in product development
and testing. Other subsidiaries of Holmes Group include Holmes Consulting Group and Holmes
Fire and Safety Ltd
We were asked to review a series of structural wall tests that were completed by UniServices
intended to determine the feasibility of mortarless construction using Firth EsiBloc Mortarless
Masonry, and to investigate the suitability for use in the construction industry in New Zealand.
There is a common perception that mortarless masonry walls behave differently under applied
loading than conventional masonry walls due to the removal of the mortar from between the blocks
introducing points of high stress into the face shells of the blocks hence resulting in the early
cracking and failure of the wall. The Firth EsiBlocs are honed and height calibrated to mitigate this
problem.
The testing completed by UniServices showed the mortarless construction resulted in relatively
even loading on the individual masonry units. In addition, very little evidence of grout leakage was
present indicating that the junctions between the blocks were relatively smooth and flat with few
voids.
The mortarless masonry walls continued to show a high degree of resistance even after the peak
load had been achieved. The overall performance was similar to that expected for conventional
masonry walls.
It is our opinion that the results obtained from this testing can be used as an indicator of the
expected wall performance, and that Firth EsiBloc Mortarless Masonry construction can be used as
a structural wall if designed to the performance provisions of the current New Zealand Standards.
Chris Allington, B.E (Hons), PhD (Civil)
MANAGING DIRECTOR
HOLMES SOLUTIONS LIMITED
Clause 2.1.1 of NZS4210, Masonry Construction:
Materials and Workmanship, states that a concrete
masonry building will fulfill the requirements of B1 if it
complies with Appendix 2.E (of NZS4210). Refer to the
table in this appendix for the durability requirements
applicable for different New Zealand locations.
E2 External Moisture
Concrete masonry must meet the objective, functional
and performance requirements of E2 External
Moisture:
• W
alls and structural elements prevent the
penetration of moisture.
• Ground moisture is not transmitted to the building
elements.
• Sub-floor spaces, concealed spaces and cavities to
be protected from moisture.
• Construction moisture to be dissipated.
The provisions of E2 can be met by following guidance
provided in publications such as The NZ Concrete
Masonry Association's publication "Concrete Masonry
- a guide to weathertight construction" or the BRANZ
Publication "Weathertight Solutions" Volume 4 Masonry. These publications provide a variety of "good
practice" details.
H1 Energy Efficiency
Acceptable Solution H1/AS1 states that construction
in accordance with NZS4243, Energy Efficiency – Large
Buildings, satisfies the requirement of NZBC H1.3.1 (a)
for the thermal resistance of the building envelope for
non-residential buildings of more than 300m2.
Construction in accordance with NZS4218, Energy
Efficiency – Housing and Small Building Envelopes,
satisfies NZBC H1.3.1 (a) for all buildings with a floor
area of less than 300m2.
Table 2(b) H.1 permits buildings of solid construction
to have lower R-values than those of non-solid
construction.
Maintenance
Normal maintenance is the work generally recognised
as necessary to achieve the expected durability and
weathertightness for a given building element. In
the case of concrete masonry that is 50 years. It
is the responsibility of the person specifying the
building to determine the normal maintenance
requirements. Where a proprietary membrane coating
is specified, refer to the manufacturer’s maintenance
recommendations for the project.
Scheduled maintenance comprises the inspection,
maintenance and reporting procedures for building
elements required to have a compliance schedule.
Details of the requirements for a Compliance Schedule
are included in Sections 100 to 107 of the Building Act
2004.
Cutting EsiBloc™
CONSTRUCTION AND INSTALLATION DETAILS
Standard Foundations
Dry Stack the Wall
Foundations for EsiBloc™ are to be prepared as for
a conventional masonry wall. Before commencing
construction ensure the position of the wall is correct
and in accordance with the plans.
Now erect the wall by simply dry stacking EsiBloc™ in
a running bond pattern. See Figure 3. See also corner
and T-junction details in Figures 7 and 8b.
Starter Bar Layout
Figure 3
It may be necessary to cut an individual EsiBloc™ to
length so that a specific wall dimension is achieved.
The cut block should not be placed at the end of the
wall. See Figure 5. Optionally the edge of the cut end
can be ground to form a matching chamfer.
Figure 6
Figure 5
Correct placement of starter bars is critical since
reinforcing set-out differs from that for conventional
masonry construction. The first starter bar is placed
100mm in from the ends and corners. The second
starter bar is 300mm from the first bar. Other starter
bars are spaced at 400mm or 200mm as required by
the engineer design. See Figure 1.
100
300
200 or 400 as per engineer
300
100
100
Figure 7
300
Figure 1
200 or 400
300
100
Starter bar spacing from ends
and corners
Mortar the First Course
The first course of EsiBloc™ must be laid with mortar
to overcome any variances in the foundations and
to ensure that the base of the wall provides a level
starting point. Dricon Trade Mortar is recommended.
It is worth investing the extra time to ensure the base
is level because any inaccuracies will be reflected and
multiplied as the height of the wall increases. See
Figure 2.
Figure 2
Adjust with Wedges where Necessary to
Maintain Levels
EsiBloc™ is factory calibrated to fine height tolerances
to minimise the need to make adjustments. However,
it is essential that levels are maintained to a line and
EsiBloc™ wedges are to be used where required to
achieve this. See Figure 4. Every 3 courses check that
the wall is plumb and straight. If an individual EsiBloc™
is out of plumb it can be lightly tapped into place.
Figure 4
Gluing to Avoid Blowouts when Grouting
During grouting, there is the possibility of blowouts
caused by hydrostatic pressure at the end of the walls,
corners and at T-junctions.
To eliminate this potential for blowouts, the last metre
of blocks at the end of each course, at corners and
at T-junctions, must be glued horizontally using a
construction adhesive suitable for use on masonry.
Wherever used, cover the full width of the shell face
edge of the blocks with the construction adhesive. Best
practice end propping of the wall is also required. See
Figure 10.
The construction adhesive should be gap filling,
moisture cure polyurethane glue which develops
rapid early strength and is specially formulated to be
unaffected by wet construction site conditions.
Corners
Right hand corners and left hand corners are achieved
using EsiBloc™ as shown in Figure 7.
T-Junctions
T-Junctions are achieved by butting EsiBloc™ units at
right angles as shown in Figure 8a below. Cut with a
hand grinder as necessary to allow reinforcing steel to
pass through the T-Junction as in Figure 8b.
Figure 8a
Figure 8b
Horizontal Steel Placement
Figure 11 Control Joint
Horizontal steel as specified in the design is to be
placed in the same manner as for standard Firth
20-Series masonry blocks.
Propping
Vertical Steel Placement
Vertical steel reinforcement is to be placed as per the
specific design after the blocks have been stacked. As
for mortared masonry, vertical steel is to be tied to the
vertical starter bars with access via “cutouts”. Care
must be taken to ensure cutouts are cut in the first
course of laid blocks at the required intervals adjacent
to the starter bars. See Figures 9a and 9b below.
The need for temporary propping or bracing of masonry
walls during construction is often overlooked. An
unfilled wall is very susceptible to failure from strong
winds. Typically walls over 1m in height are at significant
risk. It is important to take some measures to brace
the wall in order to prevent its premature failure.
Typically bracing at 3m centres is recommended in line
on both sides of the wall. See Figure 10.
Figure 10
R16 Lapping bars 800mm long
debonded one side with
grease or plastic tape
Horizontal
reinforcing
Sealant
Concrete
masonry
Vertical reinforcing
Backing rod
NB: External and internal finishing systems
omitted for clarity.
Figure 9a
Control joints are also recommended wherever:
• Wall height changes
• Wall thickness changes
• Main walls intersect other walls
• There are control joints in the floors
• Major services penetrate the walls
If the wall is subsequently plastered, the control joint
should be expressed in the plaster and the joint in the
plaster should extend the full height of the wall to the
top of the bond beam.
Figure 9b
Control Joints
Pre-Grouting Checklist
EsiBloc™ Mortarless Masonry requires specific design.
The design engineer will determine if control joints are
required. The circumstances in which control joints are
needed are the same as for solid filled conventional
masonry.
Prior to commencing grouting, ensure:
• The wall is plumb and straight. If an individual
EsiBloc™ is out of plane it can be lightly tapped into
place, this should be done within 3 courses of the
laying height.
• The face, ends and corners of the wall have been
propped.
• All vertical reinforcement steel is in place and tied
to the starter bars.
• Where services are to run through the wall, that
all conduits are correctly installed and will not
interfere with the flow of the grout around vertical
and horizontal steel.
• The structural engineer has inspected and approved
the wall.
Vertical shrinkage control joints to minimise cracking
should be introduced at the lesser of 5 metre centres or
twice the height of the wall. Designers should refer to
NZS4230, Design for Masonry Structures and NZS4210,
Masonry Construction: Materials and Workmanship.
See Figure 11 below.
Grouting
EsiBloc™ walls should be always solid filled with
EsiBloc Fill™. Dampen the block cavities prior to
pouring the wall to assist the flow and compaction.
EsiBloc Fill™ should be compacted by rodding until
settlement stops. Placement can be done using a grout
pump, but care should be taken to avoid displacement
of masonry units or creep in the wall.
Any of the grouting methods specified in NZS4210 may
be followed. The low lift grouting method, the high lift
grouting method with expansive admixture, or the high
lift grouting method without expansive admixture are
all acceptable options for use with EsiBloc™.
Remove Plastic Wedges
Once the grout has cured any protruding plastic
wedges can be removed or clipped off with a trowel.
FINISHING AND WEATHERPROOFING
Openings
Figure 13 Weatherproofing Parapets
Exteriors
Interiors
Lay EsiBloc™ in a stretcher bond pattern. The
chamfered edges of EsiBloc™ are designed to match
the aesthetics of conventional mortared masonry.
The exterior wall must be sealed using a proprietary
membrane coating system. Refer to Figure 12 for
details on weatherproofing walls and foundations and
Figure 13 for weatherproofing parapets.
The interiors can be left raw or finished in a variety
of ways, such as: solid plaster, strapping and lining
with GIB® Standard plasterboard or direct fixing GIB®
Standard plasterboard to EsiBloc™. Consideration
shall be given to the insulation requirements of H1.
Metal flashing side fixing only
- joints as per E2/AS1-70 mm
cover to waterproof finishes
on both sides
Waterproof membrane
returning over parapet
beneath parapet capping
5º slope down
towards roof
5º
70mm
Selected membrane
roofing
Top plate
DPC
Bond beam in accordance
with engineered design
Triangle fillet
Concrete masonry in
accordance with
engineered design
Figure 12 Weatherproofing Walls and Foundations
DPC
Roofing substrate
External waterproofing
system
Roof framing
Ceiling insulation
Ceiling lining
External waterproofing
system
Internal wall lining
Figure 14 gives details of
weatherproofing around windows
where the interior is optionally
strapped and lined with GIB®
plasterboard.
Concrete masonry
reinforced in accordance
with engineered
design
Waterproof membrane
200mm min. below FFL
Figure 14 Weatherproofing Window
- Head and Sill Detail with Optional Strap and Gib® Lined
100mm reinforced
concrete floor slab
Mortared rebate half
50mm
Refer to engineer for
ground clearances
D.P.M
Sand blinding on
compacted hardfill
Reinforced foundation
wall as per
engineered design
Openings will require the use of
standard Firth 20-Series masonry
units, which are to be mortared.
Weatherproofing systems used
around openings must be durable.
It is important that water does
not intrude into the joint between
joinery and the rebate at the
head and jambs of the opening.
Provision should be made against
the possibility of moisture getting
into this joint. Moisture is to be
allowed to drain away without
seeping into the walls or the
interior of the building. Provision
also must be made for drainage,
weatherproofing and pressure
equalization at the base of any
external joinery.
Reinforced concrete
footing as per
engineered design
Mortared Sill block
Weatherproofing details for
around hinged doors are shown
in Figure 15 while the details
required for a sliding door are
shown in Figure 16.
It is also recommended that
reference be made to BRANZ
pulbication "Weathertightness
Solutions" Vol 4 - Masonry, and
NZCMA publication "Concrete
Masonry - a guide to weathertight
construction".
Figure 15 Weatherproofing
Hinged Door
- Head and Sill Detail
Mortared rebate half
FREQUENTLY ASKED QUESTIONS
engineered design
Who can build with EsiBloc™?
Only registered block layers who have been trained by
Firth using EsiBloc™ Mortarless Masonry.
How does EsiBloc™ enable faster masonry
construction?
It can be rapidly dry stacked and grouted the same
day, whatever the weather and with only minimal
wedging.
Why is mortar needed to lay the first course
of EsiBloc™?
Mortar is essential to overcome any variances in the
foundations and to provide a level base for the rest of
the wall.
How does EsiBloc™ Mortarless Masonry
perform compared with mortared masonry?
Walls constructed with EsiBloc™ perform the same
as those built with conventional mortared masonry
in terms of: thermal efficiency, aesthetics, low
maintenance, structural performance, durability, noise
reduction, fire resistance and earthquake resistance.
How is the wall kept straight and plumb
without mortar?
Firth provides EsiBloc™ wedges to be used where
necessary as each course is laid. However, during
manufacture each EsiBloc™ is finely calibrated to a
height tolerance so there is minimal need for wedging
to keep the wall plumb.
Are EsiBloc™ Mortarless Masonry walls
partial or solid filled?
EsiBloc™ masonry walls are always solid filled with
EsiBloc Fill™.
How many different types of blocks are there
in the EsiBloc™ range of masonry?
There are seven different blocks in the EsiBloc™
range. See page 2 for details.
Leave a vertical and in plane
4-5mm gap between
Figure 16 Weatherproofing
Sliding Door
- Head and Sill Detail
Mortared rebate half
engineered design
Leave a vertical and in plane
4-5mm gap between
FREQUENTLY ASKED QUESTIONS
IMPORTANT NOTICE
How high can an EsiBloc™ wall be dry
stacked before it needs to be grouted?
As with mortared masonry, it is recommended that
EsiBloc™ masonry walls are built no higher than 3
metres prior to grouting with EsiBloc Fill™. Walls
shall always be propped.
What prevents wall end blowouts due to
hydrostatic pressure during grouting?
The potential for blowouts during grouting will be
eliminated by using Sika Boom G Foam to horizontally
glue the last metre of each course of EsiBloc™ at
the end of walls, at corners and at T-Junctions. Best
practice end propping is also required.
When building with EsiBloc™ can standard
mortared masonry ever be used in the same
structure?
Yes. While it is recommended that EsiBloc™ be used
wherever possible, Firth 20-Series masonry and
Dricon Trade Mortar can be incorporated if required.
Are control joints required?
Yes. Although subject to specific design, control joints
generally are required where walls change in height
or thickness, where main walls intersect other walls,
where there are control joints in the floor or where
walls are penetrated by major services.
Building with mortared masonry is tried and
true, so how reliable is the new EsiBloc™
technology?
Firth has developed the manufacturing and honing
technology used to make EsiBloc™ specifically
for New Zealand conditions. While mortarless
construction may be new to New Zealand it has been
widely accepted in Europe and North America for
many years.
This Manual has been prepared by Fletcher Concrete and Infrastructure Limited trading as Firth as part of its Firth
Industries Division ("Firth"), solely to provide general information on construction with EsiBloc™ and not as specific advice
to any particular recipient or person. Notwithstanding the contents of this Manual, construction with EsiBloc™ should be
undertaken in accordance with the New Zealand Building Code, all relevant statutory and regulatory requirements and
all relevant New Zealand Standards. Any person contemplating construction with EsiBloc™ should carry out their own
investigations and inquiries as to their specific requirements.
The information contained in this Manual is believed to be correct at the time it was prepared but no representation or
warranty, express or implied (other than as may be implied by law) is made by Firth, its officers, employees or agents as
to its accuracy, reliability or completeness.
To the fullest extent permitted by law, Firth excludes all liability for:
• any negligent misstatement, error or omission in relation to the information and/or recommendations contained in
this Manual; and
• any damages, losses, costs or expenses including, without limitation, direct, indirect, special or consequential damages
(including but not limited to damages arising from negligence) arising from or in connection with any access to, use of or
reliance on the contents of this Manual.
Further, successful construction with EsiBloc™ is dependent on numerous factors outside Firth's control - for example,
quality of workmanship, particular design requirements and non-Firth products. Firth will not be liable in relation to any
of these factors.
Firth is not under any obligation to update any information and/or recommendations contained in this Manual or to
notify any person should any such information and/or recommendations cease to be correct after the date this Manual
is published.
If you are using this Manual for business purposes, you agree that the provisions of the Consumer Guarantees Act 1993
will not apply, to the extent that contracting out is permitted by that Act.
EsiBloc™ is a trademark of Fletcher Building Ltd
®
SUSTAINABILITY: THE FIRTH CONCRETE & CONCRETE MASONRY SUSTAINABILITY LIFECYCLE
4 Environmentally compliant manufacturing plants
n
4 Surplus water and some aggregates recycled
n
4 Low transport impacts
n
4 Leftover concrete returned from construction sites
n
4 Passive solar heated thermal mass makes completed buildings
n
more energy-efficient
4
n
4
n
4
n
4
n
4
n
4
n
Most wash water returned from construction sites
For
Highly durable, low maintenance buildings and no rot
contribution to building a
High degree of noise control
sustainable tomorrow today,
Inherent fire resistance
visit www.firth.co.nz or call
Overall longer effective building life
us on 0800 800 576
Demolished concrete can be recycled as hard fill or aggregate
for our free brochure.
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