This document provides information about Ash & Lacy building systems, including their contact details and locations. It then summarizes their Ashgrid AG40 Safe-Loc spacer system, which can be used for over-roofing or over-cladding existing buildings. The system creates a cavity for insulation between the new and existing roof/cladding. It is compatible with various weather sheets and distributes loads into the existing roof structure. Proper installation following standard procedures is recommended.

1. spacer
sYstems
www.ashandlacy.co.za
proDuct information
issue no. 001 January 2016
ash & lacy building systems ltd
lonDon
gateway 3, Davis road
off cox lane, chessington
surrey Kt9 1tD
t 0208 391 9700
f 0208 391 9701
West bromWich
bromford lane
West bromwich
West midlands b70 7JJ
t 0121 525 1444
f 0121 525 3444
glasgoW
unit 4b, albion trading est
south street, Whiteinch
glasgow g14 0sY
t 0141 950 6040
f 0141 950 6080
eXeter
units 2&3 gloucester court
heathpark ind est, honiton
Devon eX14 1sJ
t 01404 549100
f 01404 549440
neath - port talbot
unit 4b, sirius Drive
rutherglen centre
baglan sa12 7br
t 01639 812569
f 01639 813133
cape toWn
29 atlantic Drive
bluewater estate
Kommetjie, cape town 7975
t +27+21+783 0114
m +27+83+215 1782

2. spacer systems
4dion.marsh@ashandlacy.com • www.ashandlacy.co.za • M +27+83+215 1782
refurbishment applications
Refurbishment
Ashgrid AG40 Safe-LocTM
is an ideal component for the
over-roofing or over-cladding of any building where the existing
roofing or cladding has become unsightly, beyond repair or an
improvement in the thermal performance is required
Ashgrid AG40 Safe-LocTM
is installed over the in-situ roofing or
cladding, providing a stable platform for the new weather
sheet. This also creates a cavity between the new and the old
where insulation can be inserted to increase the building’s
thermal performance to current building regulations and
reduce carbon emissions. This allows for a completely new
weather sheet to be installed with minimal disturbance to
operations within the building and improves the overall
aesthetic.
The Ashgrid System is compatible with all forms of pierced and
concealed fix weather sheets available in South Africa and is
specifically designed to evenly distribute the loads directly into
the existing roof structure.
Ash & Lacy would always recommend that any new system
should be fixed to structural members and not to an existing
secondary system.
Brackets should be installed as per standard procedures, at a
maximum of 1m centres and ensuring a bracket within
100mm of a spigot end. (Bracket centres may need to be
reduced in areas of high wind suction or heavy snow loading).
Comprehensive load span tables are available from Ash & Lacy
South Africa.
Dependant on the condition of the existing roofing materials a
vapour control layer and breather membrane may be required.
Care should always be taken when working with old or
deteriorated materials, existing sheeting can be brittle and all
precautions should be taken to ensure a safe working
platform.
When installing Ashgrid Safe-LocTM
spacer support system over
existing asbestos it is advisable to pre-drill a clearance hole to
prevent damage. Drilling should be carried out in conjunction
with an H-Series asbestos vacuum which is available for
purchase or daily hire from Ash & Lacy South Africa.
All works involving asbestos should be carried out in
accordance with the South African Government Gazette
Regulation No. 7276 Vol. 440 Pretoria 10 February 2002
No. 23108.
2
Refurbishment Applications 2
Asbestos 3
Over-roofing applications 4
Installation 5
Method One 5
Method Two 6
contents

3. spacer systems
6dion.marsh@ashandlacy.com • www.ashandlacy.co.za • M +27+83+215 1782Roof • Façade • Screen • Fabrication • Spacer Systems • Fixings • Steel Frame5
spacer systems
Metal sheet over steel purlin with new
pierced fix weather-sheet.
Asbestos-cement sheet over steel purlin
with new pierced fix weather-sheet.
Composite sheet over steel purlin with
new pierced fix weather-sheet.
Metal sheet over steel purlin with new
concealed fix weather-sheet.
Asbestos-cement sheet over concrete
purlin with new concealed fix weather-
sheet.
Composite sheet over steel purlin with
new concealed fix weather-sheet.
over-roofing applicationsASBESTOS
43
Asbestos
Professionals or contractors encountering asbestos roofs may feel
confusion about how to handle asbestos-containing materials.
Some may even avoid asbestos roofs altogether assuming they
will equate to expensive asbestos-removal procedures and red
tape. However, asbestos abatement (the process of removing or
minimizing asbestos health hazards from a structure) can take
many forms, including removal, enclosure or encapsulation and
doesn’t need to be as daunting as it seems.
The average asbestos cement sheet contains no more than about
10% asbestos and the fibres are deeply encapsulated within a
cement casing. The inherently strong natural bond between
cement and asbestos fibres makes emission of fibres impossible
without physical abrasive cutting, abrasive cleaning, impact
damage, severe lichen encroachment or fire damage.
The first priority when deciding best practice on how to deal with
an asbestos roof is to ascertain whether the material in its current
condition is at risk of releasing asbestos fibres. Friable asbestos-
containing-materials (ACMs)* are considered dangerous or at risk
of releasing fibres whilst Non-friable ACMs** are considered safe
and at no risk of releasing fibres.
There are further sub-categories of non-friable ACMs with
asbestos-cement corrugated roof sheets falling into the lowest risk
category. If there is still uncertainty of the materials condition an
assessment of the material can be carried out by an authorised
asbestos assessment consultant.
The vast majority of asbestos-cement roofs encountered in South
Africa are in a non-friable condition and are at no risk of releasing
asbestos fibres. Safer abatement methods such as enclosure are
recommended in these cases. Demolition and removal carries a
higher risk of releasing fibres whilst disposal has severe
environmental consequences.
The enclosure of the asbestos-cement roof sheets prevents any
further risk of weathering or deterioration rendering the material
inert and safe for the remainder of the life cycle of the building.
Asbestos-cement roofs should be considered fragile and when any
roof work is performed, suitable roof ladders, duckboards or
crawling boards should be utilised in accordance with regulation
12 of the General Safety Regulations published by Government
notice R1031 of 30 May 1986. Good practice is to install a cargo
net over the existing asbestos roof which is in turn secured around
the perimeter. This sacrificial fall arrest system remains in-situ
once the insulation and new outer roof covering has been installed.
Spacer systems are traditionally secured through the troughs of
the asbestos sheets into the underlying purlin. This drilling process
can be carried out in conjunction with an H-Series Asbestos
vacuum which captures 100% of the dust produced.
These vacuums are fitted with an Ulpa Filter for 99.999% efficiency
at 0.12 micron. They are ESD safe, meet HSG264 standards of
surveying and are fully compliant with BS EN 60335-2-69.
*Friable ACM is any material that contains more than one percent
asbestos by weight or area, depending on whether it is a bulk or
sheet material and can be crumbled, pulverized, or reduced to
powder by the pressure of an ordinary human hand.
**Non-friable ACM is any material that contains more than one
percent asbestos, but cannot be pulverized under hand pressure.
Further information is available on request from Ash & Lacy
South Africa.

4. spacer systems
8dion.marsh@ashandlacy.com • www.ashandlacy.co.za • M +27+83+215 1782Roof • Façade • Screen • Fabrication • Spacer Systems • Fixings • Steel Frame7
spacer systems
With the advent of the SANS 10400XA energy efficiency
legislation there is a requirement for deeper thermal cavities
within roof assemblies and it has become increasingly
important that careful consideration be given to the safety and
security of the installers and the spacer support system, in
particular during the construction phases.
A roofing system is at its greatest risk during the installation
stage when it is not restrained by the top sheeting and is
subjected to loading from foot traffic, temporary loading and
heavy sheet packs. This combined with drag forces from high
winds tends to compound these problems further. With
construction depths increasingly exceeding 200mm and with
the ongoing need to improve installation efficiency and system
performance, Ashgrid AG40 has been further enhanced to
satisfy these increasingly demanding requirements.
1. Lay bar on roof deck and offer the
small flange of the bracket to the small
flange of the bar.
2. Tilt and rotate bracket backwards at
desired fixing position.
3. Twist bracket and snap into position at
90° to bar.
Choice of installation methods to suit personal preference and site conditions
Method 1
installation
1. Offer the bracket to the bar at an
angle from the non-spigot end.
4. Making certain there is a bracket
within 100mm of a spigot end, install
additional brackets to match the liner
module up to 1m centres maximum.
(Bracket centres may need to be reduced
in areas of high wind suction or heavy
snow loading).
2. Slide brackets along the bar to the
desired fixing positions.
5. Engage the open end of the bar onto
the Safe-Loc™ spigot and push firmly
until the tab clicks into position. To
release, simply depress the tab with a
sharp object such as a screwdriver.
3. Snap each bracket upright to lock into
position at 90° to the bar.
6. Continue as above for quick, safe and
secure installation.
Brackets should be fixed to the substrate
using two of the appropriate Ash & Lacy
fixings for the application; also ensure the
brackets are not twisted in the bar.
Brackets may be repositioned by reversing this action and sliding along the bar as in steps 1 & 2.
Method 2
Construction depths up to and including 250mm
All spacer support systems will be exposed to in-line sway
forces during their installation. To counter this, the stability of
AG40 has been further enhanced through improvements in
bracket design and the introduction of the Safe-Loc™ spigots.
These designed-in features perform each and every time,
providing peace of mind without reliance on extra, time
consuming bar-end fixings and anti-sway brackets. For cavity
depths up to and including 250mm no additional sway control
measures need to be employed on the new Ashgrid AG40.
For exceptional site loading conditions and for heights above
250mm advice on performance should be sought from the Ash
& Lacy Technical Department.
45 6