Caltech
Cold-applied Liquid Membranes
A versatile range of cold‑applied, liquid
roofing membranes that offer a fully adhered,
durable yet flexible monolithic waterproofing
solution with excellent resistance to puncture,
abrasion and chemical agents.
Caltech systems can be applied to flat roofs,
communal walkways and balconies, and
existing profiled sheet roofs.
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+44 (0) 1744 648400
Contents
Introduction
58
System benefits, warranties and
approvals
59
System selector
60
Caltech Roofing System
61
Caltech Walkway System
62
Acrytite pitched roof coating
63
Application details
64
Product data
67
www.alumascroofing.co.uk
57
Caltech
Cold‑applied Liquid Membranes
Caltech waterproofing systems offer specifiers
and installers a versatile range of cold‑applied
waterproofing solutions for flat roofs, walkways
and existing low‑pitched sheet roofs.
Suited to both refurbishment and new build
applications, Caltech flame‑free solutions ensure
the integrity of the waterproofing is maintained
whilst opening up opportunities for time and cost
efficiencies.
The Caltech range offers a choice of application
methods and UV stable finishes, including anti‑slip
surfacing, that suit all project and site safety
requirements.
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Caltech Roofing System – a cold‑applied,
flame‑free polyurethane flat roof waterproofing
solution with an optional anti‑slip finish.
Caltech Walkway System – a fast‑curing,
cold‑applied, hard‑wearing resin based
waterproofing system for use on communal
walkways and balconies.
Acrytite – a cold‑applied, joint‑free alkyd/acrylic
waterproofing protection for the overcoating of
existing structurally sound low‑pitched roofs.
+44 (0) 1744 648400
Cold-applied Liquid Membranes
Caltech
System Benefits
Alumasc Warranty
Durable, Flexible Systems
Caltech systems are designed for simple,
flame‑free installation and are fully adaptable to
both new build and refurbishment applications.
With high elasticity and pliability, the membranes
perform in the harshest conditions, with excellent
resistance to puncture, UV degradation and
chemical agents.
Caltech systems carry a range of warranties,
covering design, product and installation.
Fire Performance
The Caltech Roofing system is tested to BS 476:
Part 3 and is unrestricted in use under the current
Building Regulations.
Flame-free Installation
Caltech systems are particularly suitable for
sensitive detailing and high risk environments. They
offer consistent technical performance across a
variety of installation methods to best suit project
requirements. All Caltech systems are flame‑free
and provide long‑term hard‑wearing waterproofing
solutions for flat or low pitched roofs, and communal
walkways and balconies.
Caltech Registered Installers
The Caltech range is only supplied to registered
contractors, whose contracts managers and
operatives must undergo a stringent Alumasc
training programme prior to obtaining registered
status. Quality of workmanship is monitored on
site on an ongoing basis to ensure compliance
with the warranty.
www.alumascroofing.co.uk
Alumasc warranties are supported by public and
product liability insurances with a total indemnity
limit of £50 million. Third party insurance backing
giving cover against latent product defects is
available via Prudential Regulation Authority (PRA)
regulated insurance brokers subject to independent
final inspection, documented compliance with an
agreed maintenance schedule and pre‑payment of
the relevant premium.
Approvals
British Board of Agrément Approved
Caltech Roofing – BBA certificate 13/5038.
Quality
Independently assessed to the ISO 9001: 2008
Quality Management Standard.
Caltech scores highly in BREEAM ratings (notably
in Section MAT5 for responsible sourcing of
materials) and contributes to a very good generic
rating in the BRE’s Green Guide to Specification,
capable of an ‘A+’ rating when installed on timber
or metal decks.
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Caltech Roofing System Selector
Caltech 30 or 50 Mesh
Minerals (for optional
anti-slip finish)
Caltech Top Coat
(light or dark grey)
Reinforcement
Caltech Base Coat (red)
Fibreforce Base Coat with
integral chopped fibre
Primers
(substrate dependent)
Substrate condition
Caltech
15 Year Warranty System
Caltech
20 Year Warranty System
Caltech
25 Year Warranty System
0.33* kg/m2 of mineral,
plus 0.25 l/m2 of top coat
0.33* kg/m2 of mineral,
plus 0.25 l/m2 of top coat
0.33* kg/m2 of mineral,
plus 0.25 l/m2 of top coat
(*up to 1kg/m2 for
maintenance areas)
(*up to 1kg/m2 for
maintenance areas)
(*up to 1kg/m2 for
maintenance areas)
1 coat @ 0.75 l/m2
1 coat @ 1.0 l/m2
2 coats @ 0.63 l/m2
(1 in dark grey, 1 in light grey)
RF100
glass fibre reinforcement
RF100
glass fibre reinforcement
RF100
glass fibre reinforcement
1.25‑1.6 l/m2
1.0 l/m2
1.0 l/m2
1.25‑1.6 l/m2
1.0 l/m2
1.25‑1.6 l/m2
1.0 l/m2 to protrusions
and joints only
1.0 l/m2 to protrusions
and joints only
1.0 l/m2 to all upstands
and details
Caltech Porous Primer,
Caltech Metal Primer
or Caltech Epoxy primer
Caltech Porous Primer,
Caltech Metal Primer
or Caltech Epoxy primer
Caltech Porous Primer,
Caltech Metal Primer
or Caltech Epoxy primer
Smooth
Rough
Smooth
Rough
Smooth
Rough
Note: See Caltech Product Data section for insulation and vapour control layer options.
Caltech Walkway System Selector
Caltech HD
15 Year Warranty System
Caltech Standard
10 Year Warranty System
Caltech UV Sealer
4‑5 l/m2
4‑5 l/m2
Caltech Walkway Minerals
(30 Mesh)
1.0 kg/m2
1.0 kg/m2
Caltech Aggregate Binder
0.5 l/m2
n/a
100 g/m2
n/a
1.0 l/m2
1.0 l/m2
0.1‑0.125 l/m2
0.1‑0.125 l/m2
Caltech RF100
Reinforcement
Caltech Walkway Base Coat
Caltech Walkway Primer
Note: See Caltech Product Data table for insulation and vapour control layer options, and separate
Product Data Sheets for full product descriptions.
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+44 (0) 1744 648400
Cold-applied Liquid Membranes
Caltech
Caltech Roofing System
The Caltech cold‑applied liquid waterproofing system provides a seamless elastomeric membrane
over rigid flat or tapered insulation. It ensures long‑term waterproof integrity and thermal values in
accordance with current regulations.
Caltech has a smooth light or dark grey mid‑sheen finish. Aluminium oxide grit granules can be
incorporated within an additional layer of Caltech top coat to form an anti‑slip surface where required,
and systems can be tailored to suit specific guarantee and surface finish requirements. Existing roofs can
be refurbished using directly applied Caltech, incorporating additional insulation where required.
Caltech Top Coat
Optional anti‑slip oxide grit
RF100 Reinforcement
Glass fibre fabric
Caltech Base Coat
Caltech Preparation layer
Self‑adhesive underlay
Alumasc PIR Insulation
Foil faced rigid urethane
Euroroof Vapour Control Layer
Torch‑applied, thermo‑adhesive or self‑adhesive
Alumasc Bitumen Primer
Other options available
Key Features
Warranty
The typical warranty period for the Caltech
Roofing System is 25 years.
Lifespan
Caltech is a high performance membrane which
is BBA certified – Cert No. 13/5038. According
to the BBA, ‘under normal service conditions the
membrane will provide a durable roof waterproofing
with a service life of up to 25 years’.
Durability
Caltech is reinforced with a chopped strand
emulsion‑bound fibreglass fabric to ensure
excellent mechanical properties and dimensional
stability, maximising durability.
www.alumascroofing.co.uk
Performance
Caltech is a cold‑applied liquid polyurethane, with
a high solids content, providing a seamless durable
waterproof membrane over rigid PIR thermal
insulation (tapered to falls or uniform thickness)
to achieve thermal values and drainage falls in
accordance with current Building Regulations and
Codes of Practice.
Fire Rating
Caltech carries an EXT.F.AA rating to BS 476: Part 3,
and the use of the system is unrestricted under the
current Building Regulations.
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Key Features
Caltech Walkway System
The Caltech Walkway System is a seamless
waterproofing membrane comprising a two part
primer and top coat, finished with aluminium oxide
grit, bound in a UV stable sealer coat. Standard
and heavy duty (HD) versions are available, which
are typically used on existing asphalt surfaces or
new (fully cured) concrete.
The Caltech Walkway System has a high‑gloss,
slip‑resistant, low‑textured finish and is available
in a standard black, with other colours available
to order.
The system is specifically intended for use
on medium to high wear areas on communal
walkways and balconies, access and escape routes
in social housing blocks, hotels and hospitals,
access areas in car parks etc.
Warranty
The typical warranty period for the Caltech
HD Walkway System is 15 years. The Caltech
Standard Walkway System is the subject of
a 10 year warranty.
Durability
The Caltech Walkway System offers a long‑term
waterproofing solution. Medium to high trafficked
areas are well protected from future damage and
potential costly repairs.
Performance
The Caltech Walkway System is fast‑curing and
walkable after 3‑4 hours, and therefore suitable
for application in areas where access cannot be
restricted for more than a few hours, especially
advantageous on occupied residential projects.
Caltech Walkway UV Sealer
UV stable sealer coat
Caltech Walkway Minerals
30 mesh aluminium oxide mineral
Caltech Aggregate Binder
(HD system only)
RF100 Reinforcement
Glass fibre fabric (HD system only)
Caltech Walkway Base Coat
Caltech Walkway Primer
Concrete Deck
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+44 (0) 1744 648400
Cold-applied Liquid Membranes
Caltech
Acrytite Pitched Roof Coating
Acrytite is an alkyd/acrylic roller‑applied seamless waterproofing coating. It comprises a single part
primer, base coat and top coat, available in a range of UV stable colours.
Acrytite is formulated to act as a flexible, joint‑free waterproof coating for the refurbishment of existing
structurally sound low‑pitched sheet roofs.
Acrytite has a plain colour, low sheen finish.
Key Features
Lifespan
Application of Acrytite will typically provide
up to 10 years’ waterproofing integrity to
existing roofs.
Performance
The system is simple to install and quickly
resistant to rainfall.
Application Areas
Suitable for the refurbishment of asbestos and
fibre cement sheeting, profiled metal sheets, PVC
and PVF2 coated metal etc., subject to a site
survey to establish compatibility and preparation
requirements.
www.alumascroofing.co.uk
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Application Details
1
Upstand with Coping
1
2
Concrete coping and cavity closer
2 Cavity tray
3 Derbitech HD sealant
3
4
4 Alumasc Termination Bar
5
6
7
8
5 Caltech Top Coat
6 Caltech RF100 reinforcement
9
7 Caltech Base Coat
8 Caltech Preparation Layer
10
11
9 Alumasc PIR insulation
10 Euroroof vapour control layer
11 Primed substrate
Upstand with GRP Trim
and Check Curb
2
3
4
5
6
1
1
Alumasc GRP trim
2 Treated timber packer
7
3 Caltech Top Coat
4 Caltech RF100 reinforcement
8
9
5 Caltech Base Coat
6 Caltech Preparation Layer
7 Alumasc PIR insulation
8 Euroroof vapour control layer
9 Primed substrate
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+44 (0) 1744 648400
Cold-applied Liquid Membranes
Caltech
1
Refurbishment Outlet
3
5
6
1
7
ProLINER refurbishment outlet
2 ProLINER sealant
8
9
10
3 Treated timber packer
4 Existing roof outlet
5 Caltech Top Coat
6 Caltech RF100 reinforcement
4
7 Caltech Base Coat
2
8 Existing roofing
9 Existing insulation
10 Existing structural deck
Modular Rooflight Curb
1
1
Alumasc modular rooflight
2 Caltech Top Coat
2
3
4
3 Caltech RF100 reinforcement
5
4 Caltech Base Coat
5 Caltech Preparation Layer
6
6 Alumasc PIR insulation
7
8
www.alumascroofing.co.uk
7 Euroroof vapour control layer
8 Primed substrate
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Application Details
2
Upstand with Aluminium Coping
1
1
3
4
5
Alumasc Skyline aluminium coping
6
2 Cavity closer
3 Caltech Top Coat
7
4 Caltech RF100 reinforcement
5 Caltech Base Coat
8
9
6 Caltech Preparation Layer
7 Alumasc PIR insulation
8 Euroroof vapour control layer
9 Primed substrate
Cold Pipe Penetration
1
1
2
3
4
5
6
7
Cold pipe
2 Weathering cowl
3 Retaining clip
8
9
10
4 Caltech Top Coat
5 Caltech RF100 reinforcement
6 Caltech Base Coat
7 Caltech Preparation Layer
8 Alumasc PIR insulation
9 Euroroof vapour control layer
10 Primed substrate
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+44 (0) 1744 648400
Cold-applied Liquid Membranes
Caltech
Product Data – Caltech Roofing System
Product
Characteristic
Description
Application Method
Size
Thickness or Coverage
Caltech Minerals
30 or 50 mesh
aluminium oxide grit
Optional anti‑slip surface
Evenly broadcast into
additional top coat
(0.25l/m2)
25 kg
0.33 kg/m2
Caltech Top Coat
Elastomeric
polyurethane
Light or dark grey top coat
Brush or roller
12.5 litre
Membrane reinforcement
Loose laid into base coat
1 .0 x 100m
Red base coat
Brush or roller
12.5 litre
1.0‑1.6 l/m2
For details and protrusions
Brush or roller
12.5 litre
1.0‑1.25 l/m2
Aluminium faced
membrane
Self‑adhesive underlay
Self‑adhesive
40 x 1.08m
0.6mm
Foil faced
For self‑adhesive underlays
PU or thermo‑adhered
1200 x
2400mm
Various
Aluminium/glass
reinforced
vapour barrier
Aluminium/glass
reinforced
vapour barrier
Aluminium/Woven
glass reinforced
vapour barrier
Flame‑free vapour barrier,
to receive insulation in
PU adhesive
Self‑adhesive
15.0 x 1.1m
2mm
Surface heated vapour barrier
to receive insulation
Heat activation by gas
torch
10 x 1.0m
2mm
Torch‑applied vapour barrier
to receive insulation in
PU adhesive
Torch‑applied
10 x 1.0m
3mm
Brush or roller
5 litre
approx 25‑50m2
Brush or roller
5 litre
approx 70m2
Brush or roller
4 litre
approx 20m2
Brush or roller
25 litre
150‑250m2
Brush or roller
25 kg
125‑250m2
Membrane
Caltech
Reinforcement Layer
Caltech Base Coat
Caltech Fibreforce
Preparation Layer
Caltech
Preparation Layer
Emulsion‑bound
glass fibre
Elastomeric
polyurethane
Pre‑reinforced
elastomeric
polyurethane
1 5 yr: 1 x 0.75 l/m2
20 yr: 1 x 1.0 l/m2
25 yr: 2 x 0.63 l/m2
RF100 ‑ 100 g/m2
RF225 ‑ 225 g/m2
Insulation
Alumasc PIR FF
Vapour Control Layers
Euroroof
Self‑Adhesive
Euroroof
Thermo‑Adhesive
Euroroof Torchtite
Primers
Caltech
Porous Primer
Polyurethane resin
Caltech
Metal Primer
Metallic based
Caltech
Epoxy Primer
Epoxy based
Alumasc
Bitumen Primer
Euroroof
ZK Primer
Bitumen based
Solvent based
For concrete, bituminous and
timber to receive Caltech
For weathered, non‑rusted
metal, & 'live' bituminous
surfaces to receive Caltech
Prime corroded, hand
prepared metal to
receive Caltech
Primer for vapour
control layer
Primer for vapour
control layer
Note: Coverage rates are variable depending on prevailing conditions.
Product Data – Caltech Walkway System
Product
Characteristic
Description
Application Method
Size
Thickness or Coverage
Caltech
Walkway UV Sealer
Clear or solid colour
two part polyurea
UV stable sealer
Brush or roller
2 litre
0.2‑0.25 l/m2
Caltech
Walkway Minerals
30 mesh aluminium
oxide grit
Anti‑slip surfacing
Evenly broadcast into
aggregate binder
(HD system) or base coat
(Standard system)
25 kg
1.0 kg/m2
Caltech
Aggregate Binder
Caltech RF100
Reinforcement Layer
Two part
polyurethane
Emulsion‑bound
glass fibre
Brush or roller
5 litre
0.5 l/m2
Loose laid into base coat
1.0 x 100m
100 g/m2
Caltech
Walkway Base Coat
Two part
polyurethane
Brush or roller
4.5 litre
1.0 l/m2
Caltech
Walkway Primer
Polyurethane
Brush or roller
5 litre
0.1‑0.125 l/m2
Binder for walkway minerals
(HD system only)
Membrane reinforcement
(HD system only)
Embedment coat to receive
reinforcement (HD system)
or walkway minerals
(Standard system)
Substrate primer
Note: Coverage rates are variable depending on prevailing conditions.
www.alumascroofing.co.uk
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