Twiga Glasswool Insulation


Twiga Insul is a lightweight, compressible insulation material, consisting of fine, long, inorganic glass fibers bonded together by a high temperature binder. The product is light gold in colour and its superior tensile strength, handleability and resilience offer significant advantages during transport and installation. These unique characteristics of glass wool, combined with its fire safe properties, make it especially suitable for a wide variety of thermal and acoustic insulation applications, ranging from duct and metal roof insulation to applications in solar collectors and generator acoustic enclosures.

Twiga Insul is available in rolls, slabs and boards - in various densities and thicknesses and with a wide range of factory applied facings. The product is recommended for use in both hot and cold applications ranging in temperature from minus 195° to plus 450℃.Factory applied facings include reinforced aluminium foil, fiberglass tissue, black glass tissue and a wide range of imported premium facings, which are widely used in metal building applications. Our technical sales staff will be pleased to recommend the appropriate density, thickness and facing combination for your specific application.

Twiga Glasswool Insulation

Applications

Twiga Insul is manufactured in various densities and thicknesses for different applications. Recommended product specifications for selected market and applications are as follows:

Segment Applications Recommended Products Benefits
HVAC Duct Thermal
  • 16 kg/m3 to 32 kg/m3 Rolls
  • 48 kg/m3 Boards
  • Facing: FSK, Black FSK
  • Double sided FSK
  • Temerature control
  • Fire safety
  • Energy conservation
Duct Acoustic
  • 48 kg/m3 Boards
  • 32 kg/m3 Rolls
  • Facing: BGT, FGT
  • Sound absorption
AHU Room
  • 32 kg/m3 Rolls
  • Facing: FGT, BGT
  • Sound absorption
  • Temerature control
Textile Duct Thermal
  • 16 kg/m3 to 24 kg/m3 Rolls
  • Facing: FSK
  • Temerature control
  • Prevents condensation
  • Fire Safety
Over False Ceiling
  • 16 kg/m3 to 24 kg/m3 Rolls
  • Temerature control
  • Reduces heat load
  • Energy conservation
  • Easy to apply
Metal Roof Insulation As per pre-engineered metal buildings As per pre-engineered metal buildings
Pre Engineered Metal Buildings Metal Roof Insulation
  • 12 kg/m3 to 24 kg/m3 Rolls
  • Facing: FSK, WMP-VR, HSMAF
  • Temerature comfort
  • Sound absorption (eg: rain noise)
  • Eliminates requirement for 2nd skin
  • lowest cost insulated solution
  • Fire safety
  • Easy to install
  • Non corrosive to metal
  • Aesthetically appealing
Wall Cladding
  • 16 kg/m3 to 24 kg/m3 Rolls
  • Facing: FSK, WMP-VR
  • Temerature comfort
  • Sound absorption
Multiplex, Theatre, Studio and Other Sound Spaces Acoustic
  • 16 kg/m3 to 32 kg/m3 Rolls
  • 40 kg/m3 to 64 kg/m3 Boards
  • Facing: BGT, FGT, Black
  • Glass Cloth
  • Ceiling Tiles - 100 kg/m3
  • Boards / Tiles
  • Improves acoustics
  • Fire safety
  • Easy to handle and install
Commercial and Public Buildings Underdeck
  • 24 kg/m3 to 32 kg/m3 Rolls / Slabs
  • Facing: FSK
  • Energy conservation
  • Reduces heating / Cooling load
  • Fire safety
Partitions
  • 16 kg/m3 to 32 kg/m3 Rolls
  • Facing: BGT / FGT
  • Noise control
Cavity Wall
  • 32 kg/m3 Rolls
  • 48 kg/m3 Boards
  • Energy conservation
  • Reduces heating / Cooling load
  • Noise control
Transport AC Buses, Railway Coaches (Walls & Ceilings)
  • 16 kg/m3 to 24 kg/m3 Rolls
  • Facing: FSK
  • Dimentional stability
  • Resists jolting and vibrations
  • Noice control
  • Fire safety
  • Thermal comfort
Spandrel / Structural Glazing Walls
  • 24 kg/m3 to 64 kg/m3 Boards
  • Facing: BGT
  • Easy to apply
  • Non-corrosive
  • Fire safety
Cold storage Walls & Ceiling
  • 22 kg/m3 to 27 kg/m3 Slabs
  • Energy conservation
  • Reduces heat load
  • Fire safety
Acoustic Enclosures Gensets
  • 24 kg/m3 to 32 kg/m3 Rolls
  • Facing: BGT
  • Sound absorption
  • Fire safety
  • Non-corrosive
  • Resists vibration and jolting
  • Durable / Long life
Solar Collectors Collector plate
  • 16 kg/m3 to 20 kg/m3 Rolls
  • Minimizes heat loss
  • Non corrosive
Thermal Power Stations ESP
  • 24 kg/m3 to 32 kg/m3 Rolls
  • Heat conservation
  • Noice control
  • Non corrosive
  • Durable / Long life
  • Resists vibration
Chimney (Single Flue & Multi Flue)
  • 32 kg/m3 Rolls
  • 48 kg/m3 & 64 kg/m3 Boards
  • Keeps gases hot
  • Minimizes heat loss
  • Non corrosive
  • Durable / Long life
Pipes and Vessels
  • 24 kg/m3 to 32 kg/m3 Rolls
  • 52 kg/m3 to 64 kg/m3 Boards
  • Temperature control for process control
  • Energy conservation
  • Personnel protection
  • Non corrosive
Refineries, Petro Chemical Units & Process industries Pipes and Vessels
  • 24 kg/m3 to 32 kg/m3 Rolls
  • 52 kg/m3 to 64 kg/m3 Boards
  • Temperature control for process control
  • Energy conservation
  • Personnel protection
  • Non corrosive
  • Durable / Long life
LNG Storage Tanks Suspended Deck
  • 12 kg/m3 to 20 kg/m3 Rolls
  • Easy to apply
  • Eneergy conservation
  • Temperature maintenence
  • Excellent resilience
  • Withstands expansion and contraction
FSK = Foil Scrim Kraft; FGT = Fiberglass Tissue; BGT = Black Glass Tissue; WMP-VR = Premium White Facing; HSMAF = High Strength Meshless Aluminium Foil

Twiga Insul Characteristics

Temperature Range Twiga Insul is suitable for applications ranging from minus 195℃ to 230℃. For special applications upto 450℃, high temperature binder is available. Aluminium foil facing is suitable upto 120℃.
Chemical Stability Twiga Insul is chemically inert. Application does not cause accelerate corrosion. Twiga insul is rot proof and odourless.
Fire Safety Twiga lnsul is non-combustible in accordance with BS 476 Part 4, ISO 1182, IS 3808 and IMO (FTP).
  • conforms to Class '0' as per BS 476 Part 6 & 7
  • conforms to Class 1 as per BS 476 Part 7
  • non emission of dense smoke and toxic gases (Toxicity index 0.65 as per BS 6853)
  • non depletion of oxygen (high oxygen index of 70)
Biological Twiga lnsul is inorganic. Does not encourage growth of fungiand vermin.
Dimensional Twiga lnsul is stable under varying conditions of temperature and humidity when applied correctly. Excellent tear strength and not prone to sagging or settling. Rigid slabs have inherently high compression resistance.
Vibration and Jolting Resistance Conforms to IS 31441BS 2972.
Moisture Content Lessthan2%inaccordancewith1S3144 I BS2972.
Water Absorption Less than 2% in accordance with IS 31441BS 2972.
Shot Content Nil,exceeding requirements of IS 31441BS 2972.
Odourless Conforms to IS 3144.
No Mould Growth Conforms to IS 3144.
Recovery After Compression More than 95% in accordance with IS 8183I BS 3958 Part 5.

Density ranges from 10 kg/m3 to 130 kg/m3

Thickness ranges from 12mm to 100 mm.

Other densities and thicknesses available upon request.

ThermalConductivity (K-values) & ThermalResistance (R-values) of Twiga lnsul

Thermal Conductivity in W/MK

Mean Temp. in Deg C Density in kg/m3
12 16 24 32 48
10 0.038 0.035 0.031 0.030 0.027
25 0.041 0.039 0.033 0.032 0.030
50 0.048 0.043 0.039 0.035 0.033
100 0.065 0.057 0.047 0.043 0.040

Tolerance : +/-5%


Thermal Resistance in sq.m.K/W, Thickness 25 mm

Mean Temp. in Deg C Density in kg/m3
12 16 24 32 48
10 0.66 0.71 0.81 0.83 0.93
25 0.61 0.64 0.76 0.78 0.83
50 0.52 0.58 0.64 0.71 0.76
100 0.38 0.44 0.53 0.58 0.63

Tolerance : +/-5%


Thermal Resistance in sq.m.K/W, Thickness 50 mm

Mean Temp. in Deg C Density in kg/m3
12 16 24 32 48
10 1.32 1.43 1.61 1.67 1.85
25 1.22 1.28 1.52 1.56 1.67
50 1.04 1.16 1.28 1.43 1.52
100 0.77 0.88 1.06 1.16 1.25

Tolerance : +/-5%


Acoustic Insulation Values

Specification (Density x Thickness) Average NRC Frequency Range 100Hz-8000Hz
16 kg/m3 x 50 mm 0.92
24 kg/m3 x 50 mm 1.00
32 kg/m3 x 50 mm 1.05
48 kg/m3 x 50 mm 1.20

Tolerance : +/-5%


Aluminum Foil

SISILATION- with a product history of over 20 years SISALATION is the brand leader in Sri Lanka for Roof Insulation and has gained recognition for its lasting quality and performance in the Roof insulation Industry. This is one of the key strengths that this division has. SISALATION Heat Reflective Roofing Foil is of superior quality and comes highly recommended by Consultant Architects and leading Contractors. In keeping with strategy of offering a complete solution the services rendered by this division include analyzing the type of insulation required and advise the customer on all areas that are related to reducing temperature in a building and conserve energy. They also offer services related to installation and/or supervise and guide if the client decides to do the installation by themselves.



SLJ Sisilation - 100 | SLJ Sisilation - 735

SLJ Sisilation -100

Double Sided Reflective Aluminum Foil Insulation

Description & Application

A light duty, utility grade D/S Foil Insulation. It is made from 2 outer layers of pure aluminum foil and 1 layer natural Kraft paper. These layers are bonded together with polyethylene and reinforced with 3-way fiberglass scrim. It is ideally used as sarking and insulation under roofs, in walls behind cladding or under timber floors, for residential and commercial building. Combining with glasswool / rockwool / mineral wool / foam insulation, it is excellent as a vapor barrier for air-conditioning ducts, pipes and vessels.

Product Construction

COMPOSITION DESCRIPTION VALUE (ENGLISH) VALUE (METRIC)
Foil Aluminum 0.28 mil 7 micron
Reinforcing - MD Fiberglass 2 / inch 8 / 100mm
Reinforcing - XD Fiberglass 3 / inch 12 / 100mm
Adhesive Polyethylene ------ ------
Kraft Natural 36.6 lbs / 3000 ft2 60gsm
Adhesive Polyethylene ------ ------
Foil Aluminum 0.28 mil 7 micron

Typical Physical Properties

PHYSICAL PROPERTIES DESCRIPTION VALUE (ENGLISH) VALUE (METRIC)
Basis Weight Aluminum 0.28 mil 7 micron
Permeance (WVTR) Fiberglass 2 / inch 8 / 100mm
Tensile Strength - MD Fiberglass 3 / inch 12 / 100mm
Tensile Strength - XD Polyethylene ------ ------
Burst Strength Natural 36.6 lbs / 3000 ft2 60gsm
Low Temperature Resistance ion Polyethylene ------ ------
High Temperature Resistance Aluminum 0.28 mil 7 micron
Emissivity ASTM E408 0.03 0.03

AVAILABLE ROLL WIDTH: 1.25M, 1.35M

REMARKS

  1. The data above are typical results and subject to change without notice.
  2. Tolerance: Weight and Thickness: 10%; Width: 3mm; Length: 0.5%.
  3. The products should be stored at room temperature, kept from wet and kept away heat source.
  4. The users should take test and do trial-application on the above products before coming into application so as to witness and ensure suitability for their special purpose and technique.

SLJ SISILATION - 735

Foil-Scrim-Kraft Facing & Vapor Barrier

Product Application

A utility grade Foil-Scrim-Kraft Facing with 3-way scrim and 50gsm Kraft, mainly used as a facing & vapor barrier of glasswool / rockwool / mineral wool / foam duct wrap insulation, also suitable for other insulation applications where a general use vapor retarder is needed. It is also a good choice for radiant barrier applications because of its low emissivity.

Facing Composition

COMPOSITION DESCRIPTION VALUE (ENGLISH) VALUE (METRIC)
Foil Aluminum 0.28 mil 7 micron
Reinforcing - MD Fiberglass 2 / inch 8 / 100mm
Reinforcing - XD Fiberglass 3 / inch 12 / 100mm
Adhesive Polyethylene ------ ------
Kraft Natural 30 lbs / 3000 ft2 50gsm

Typical Physical Properties

PHYSICAL PROPERTIES TEST METHOD VALUE (ENGLISH) VALUE (METRIC)
Basis Weight Scale 17.4 lbs / 1000 ft2 85 gsm
Permeance (WVTR) ASTM E96, Procedure A 0.1 perm 5.75 ng/N.s
Tensile Strength - MD ASTM D828 26 lbs/In 115 N/25mm
Tensile Strength - XD ASTM D828 11.5 lbs/In 50 N/25mm
Burst Strength ASTM D774 43.5 psi 30 N/cm2
Low Temperature Resistance ion cASTM D1790 4 hrs @-40 F (- 40 C) Remains Flexible No Delamination Remains Flexible No Delamination
High Temperature Resistance ASTM D1790 4 hrs @ +240 F (+116 C) Remains Flexible No Delamination Remains Flexible No Delamination
Dimensional Stability ASTM D1204 @ 150F (65C) Less than 0.5% Less than 0.5%
Emissivity ASTM E408 0.03 0.03

AVAILABLE ROLL WIDTH: 1.25M, 1.35M

REMARKS

  1. The data above are typical results and subject to change without notice.
  2. Tolerance: Weight and Thickness: 10%; Width: 3mm; Length: 0.5%.
  3. The products should be stored at room temperature, kept from wet and kept away heat source.
  4. The users should take test and do trial-application on the above products before coming into application so as to witness and ensure suitability for their special purpose and technique.

Aluminum Tape and Roofing Mesh


BRC WELDED ROOFING MESH - We use in fixing of reinforcement solutions to the construction industry. This reinforcing Mesh has a wide variety of uses ranging from the ordinary house hold to heavy Industry.


ALUMINIUM TAPES - Aluminium Tape are available in two types as Reinforced and Non reinforced with different size

Extruded Polystyrene Boards


THE NEED FOR THERMAL INSULATION

In extremely hot climates, the high energy demand for condition is constantly increasing, One of the best ways to conserve energy is to provide high class insulation for buildings.

PRODUCT DESCRIPTION

isopfoam's extryuded polystyrene, panel has sealed cells, linked to one another and is produced by a continuous, fully automated extrusion process in accordance with international specifications and standards. This particular technology makes it possible to guarantee exceptional mechanical properties. resistance to the diffusion of water vapour, resistance to water absorption, uniform density distribution. dimensional stability, very high compressive strenght, aging resistance and also immunity against insects. pests, bacteria, rodent attacks, and micro organisms as it does not provide them with nutrients.

PRODUCT DESCRIPTION MAJOR APPLICATION BOARD COVERING DIMENSIONS (MM)
ISOFOAM - ND 32-35kg/Ixe Extruded polystyrene rigid foam with skin. Available With and without Shiplap edges. Thcral Insulation Boards for
  • - Roofs
  • - Floors
  • - Walls
  • - Perimeter Insulation
for underground construe tree and cellar outer walls.
Width 600
Length 1251f
Thickness 50.60 65, 75 80, 100 : 25, 30. 40
available in straight only
SPECIFICATIONS

Extruded polystyrene rigid foam, coloured blue throughout with skin on top and bottom sides. as manuttiv-lured by INCIP0,41111. Material dimensions and thickness shall be according to the drawings, specifications and applicable codes ol practice for the use of insulation and the material shall have the following properties:-

  • 1. During the process of five years aging thermal conductivity lies within the range of 0.027 - 0.031 Whnk (0.19 - 0.21 BTU in/sq. ft. h℉) when tested at 24℃ (75 ) in accordance with DIN. 52612 ASTM C-518.
  • 2. Compressive strength of 280 KPA (40 psi) average when tested according to DIN. 53421 or ASTM 0-1621 (Strength according to thickness).
  • 3. Water absorption of 1% average when tested in accordance with ASTM 0-2842.
  • 4. Water vapour permeability within a range of 0.4-0.6 perm inch when tested in accordance with ASTM C-355-64.
THE INVERTED ROOF CONCEPT

The Inverted Roof Concept, which is also known as protected membrane or upside down roofing, succeeds in insulating both the weather-proofing membrane and the R.C. slab front extreme thermal stresses. This is achieved by inserting the arrangement of the thermal insulation and the water proofing membrane and by placing ISOFOAM extruded polystyrene thermal insulation board above, instead of below, the water-proofing membrane.

This concept is very simple to apply with minimum labor requirements and is very effective in protecting the waterproofing membrane.

ISOFOAM incorporates the following properties to withstand extreme temperature, thermal cycling meeha-nical stresses due to live loads and site traffic, and high relative fetidity.

  • - Closed-cell with homogeneous structure and uniform density distribution.
  • - Very low moisture absorption.
  • - Long term high insulation efficiency.
  • - Good compressive strength.
  • - Resistance to aging.
  • - Resistance to rotting
IN-SITU CONCRETE LAYER
ADVANTAGES OF THE INVERTED ROOF CONCEPT

The simplicity of the application of this concept and its efficiency has been proven in Kuwait, the Middle East. LISA and Europe. The waterproofing covering does not suffer thermal shocks, and maintains an optimum and constant temperature. ISOFOAM protects the water proofing membrane frond ultraviolet degradation and from weathering (ram, wind etc.) thus delaying the aging effect. When the waterproofing is of the bituminous type, it is recommended to insert a protective layer of polythene film between the ISOFOAM and the waterproof covering.

This protection will give a longer life to the water-proofing membrane which will function as a vapour barrier and prevent interstitial condensation. The cost of the vapour barrier required in conventional roofing systems is therefore saved. ISOFOAM when laid loose on the waterproofing membrane and loaded with paving slabs or gravel. will not only protect the membrane during construction and during maintenance of plant and equipment situated at roof level, but also the boards can be re-used when extending the building at a latter stage.

Pre insulated Ducts


Introduction

Fiberglass duct board is a rigid board of insulation material manufactured from resin bonded inorganic glass fibers. The exterior surface of the board is a factory-applied reinforced aluminium foil-air barrier and water vapour retarder. The edges of the board are formed by machine to create a ship lapped edge or grooves, to allow the grooves to be joined to build straight ducts of any size or length. Duct system components such as tees, offsets, elbows and transitions may be fabricated from flat duct board. Fibrous glass duct boards are fabricated into ducts to make a fibrous glass duct system.

Features & Benefits
  • Fire Safe - Made from rigid glasswool boards which provides thermal and acoustic insulation
  • Faster installation - Easy to install and light weight
  • Lower installed cost - Minimal material waste, higher productivity
  • Flexibility of site fabrication and assembly-Adaptable to job site changes
  • Precision of factory made ducts and Low leakage rates
  • Improved performance and energy savings
  • Excellent aesthetics - Cleaner look
  • Outer facing provides resistance, stiffness and a vapor barrier and inner facing provides a smooth and cleanable surface
Specification
Glass wool duct for thermal application

Pre-insulated duct board shall be made of high density of rigid resin bonded fire safe glass wool with both side factory laminated aluminum foil, outer facing foil is having - Reinforced aluminum + Kraft+ glass veil and inner facing - Black glass textile.

Density of glass wool duct board shall be 75-80Kg/m3 and at the edge of panels shall have density of 150Kg/m3 .Size of panels for duct construction as below.

Thickness (mm) Length (m) Width (m) 25 3 1.19

The thermal conductivity of duct board shall not be exceeding 0.033 W/m K at 10 deg C means temperature and thermal resistance should be more than 0.6 m2.K/W.

Glass wool duct panels shall be tested as per EN 13403 Vapour permeance of duct panels should be approximate value: 0.013 g/m2. day mm Hg (outer facing)

Mechanical stiffness: R5 rigidity, according to EN 13403 (European Standard for non metallic ducts) this rigidity is the maximum level of the ones established by this standard.

Duct board should withstand pressure under 800 Pa with no evidence of fissures or swelling (test according to EN 13403)

Fire test: Panels shall be tested as Euroclass: Euro class C-s1, d0

  • s1: null smoke emission
  • d0: non flaming droplets / particles.

Joint System: Duct boards should have exclusive design with male / female edges, in order to provide greater strength for joints, easy installation and shall reduce the number of cutting operation & exceptional inside finish.

Tools and Accessories for Installation of Duct Boards shall be followed as per recommendation of manufacturer's manual.

Duct Support: Duct board shall be installed, using support as described in installation manual of manufacturers. Maximum distance between hangers / support shall not exceed for horizontal ducts as

  • 900 mm inner dimension maximum distance of hanger 2.4 m
  • 900-1500 mm inner dimension maximum distance of hanger 1.8mm
  • Above 1500 mm inner dimension maximum distance of hanger 1.2 m
Inspection and Testing

Duct dimensions shall be checked based on the duct dimension / layout drawings duly approved by the Architects/ Consultants.

The ducts, branches elbows etc. shall be inspected and the joints and connection shall be checked properly before these are assembled in position. After assembly the system shall be checked for tightness of male/ female joints to avoid the leakage

Climaver Al. tape of 75mm thickness shall be applied on each male / female joint to avoid the leakage of air

Full sized standard dimension sheet as specified are to be used and any patched or made-up pieces of duct work are liable to be rejected. Joints between male/ female connections shall be fitted properly and Al. tape of 75 mm thickness shall be applied on joints.

Test points shall be provide at the discharge of each air handling unit and at each individual zone of the duct work system. Test points shall consist of 25mm diameter sockets fitted with sealing plugs which can be removed for the fitting of measuring devices. Test points shall be insulated as for the duct work and shall be provided with identification labels.

Rectangular risers should be free supported by angles or channels secured to the sides of the duct flanges with bolts or sheet metal screws or blind rivets. The supporting angle or channel should be freely resting over the slab cut-out. Riser support intervals should be limited to one storey height.

To ensure the air tightness, all ducts shall be checked with Leak Test after completion of duct fabrication but before installation of duct system.

Twiga Flexible Ducts


Twiga Flexible Duct designed for HVAC systems is light weight, strong, fully flexible and compressible yet dimensionally stable.

Twiga Flexible Duct is made of double lamination of films permanently bonded to a coated spring tough steel wire helix. Thermal efficiency is provided by wrapping the exterior with a blanket of fiberglass wool insulation in various densities & thicknesses for required thermal resistance. The outer jacket is made of double laminated film with fiberglass yarn reinforcement, which acts as a vapour barrier surface as well.

Twiga Flexible Duct can widely be used in all Air Conditioning / Ventilating Systems including commercial & office buildings, hotels, hospitals and many other industrial and residential applications.

Twiga Flexible Ducts come in a variety of styles and constructions and provide the most economical solution to your air handling needs.

Twiga Flexible Ducts
Features & Benefits
  • Air tight, No air leakage, No fiber erosion
  • Insulation "Twiga Insul" Class O rated Glasswool
  • Core material, Low friction loss, strong and flame resistant
  • Vapour barrier-Reinforced for maximum toughness and tear resistance
  • Wire, Strong and non corrosive
  • Modular and economical air distribution system with maintenance free life - high degree of flexibility which allows it to be connected to any desired position
  • A quick and economical means of correcting misalignment between system components.
  • Available as bare and preinsulated
  • Reduces total installed cost, Fast and easy to install
  • Allows ducting around obstacles where fabricated and fitted ducts would be difficult and costly to install.
Properties

Insulated Flexible Ducts

Standard Length :25 ft. / 7.5 M Diameter Range :100 mm to 500 mm (4" to 20") Maximum Rated Velocity : 4000 ft /min Temperature Range : 0-90℃ Maximum Rated Positive Pressure : 10 inch Water Maximum Rated Negative Pressure : 1 inch Water Standard Insulation density :16 Kg/m3 Standard Insulation Thickness : 25mm Insulation R Value : 0.64 Sq.mK/W Fire Rating : certified as per BS 476 Part 5, 6 & 7

Note: Alternate insulation densities and thicknesses are available upon request.

Standard Length : 25 ft. / 7.5 M Diameter Range : 100 mm to 500 mm (4" to 20") Maximum Rated Velocity : 4000 ft /min Temperature Range : 0-90℃ Maximum Rated Positive Pressure : 10 inch Water Maximum Rated Negative Pressure : 1 inch Water

Installation

All the flexible duct shall be installed in a fully extruded position and bends made with adequate radius.

The maximum allowable sag, between any two adjacent suspension points, should not exceed 50 mm per meter.

The distance between any two adjacent suspension points may vary from 1.50 to 3.00 meter, depending upon the type of flexible duct in use.

Flexible ducts mounted above suspended ceiling should always be independently supported.

All bends should be made as large as possible and should have a radius of not less than the diameter of the duct in use. Double bends should be avoided, however if un-avoidable, ensure that each radius is not less than R = 2 x D.

Ideally the hanging straps should supports the flexible duct with a minimum of half the circumference surface in contact, and without reducing the effective inside diameter of the duct. It is also recommended that the minimum width of material to be used for the hanging straps should be at least 25 mm.

Extra care should be taken when making connection to fixed conventional ducts, etc., and ensure that they do not become too stressed. An additional support is recommended to overcome the potential problem.

Light railing is a good alternative hanging support when using long length of flexible duct.

Specification

Uninsulated flexible duct shall be made of double lamination of metalised polyester film permanently bonded to a coated spring steel wire helix. Duct shall be in tear and puncture resistant construction.

Insulated flexible duct - Inner core should be made of double lamination of polyester film permanently bonded to a coated spring steel wire helix. Blanket of fibreglass insulation of R 4.2 (RSI - 0.76 m2K/W) having density of 24 kg/cu.meter and thickness of 25 mm shall be wrapped over the inner core & covered with tear and abuse resistant outer jacket cum vapour barrier made of fibre glass reinforced double layer of metalized polyester film laminate.

Twiga Insul Duct Wrap


TWIGA Insul Duct Wrap Ductwrap, a light weight thermal insulation blanket having long product life is specifically designed to wrap around air conditioning ducts. Manufactured from fine, stable and uniformly textured non combustible inorganic glass fibers bonded together by a non water soluble and fire retardant binder.

Twiga Insul Preformed Pipe Sections
Features & Benefits
Higher thermal resistance (R Value)

Minimising the loss of heat from the working fluid to the surrounding space will save energy and cost - provide uniform temperature of the supply air. It is noticeable that the efficiency of an insulation material directly depends on the thermal resistance(R - Value).

More thermal resistance less heat loss & gain inside the duct. To achieve higher thermal resistance (R-Value) is required more thickness of insulation material, if thermal conductivity of the insulation material is approximate same in same unit and mean temperature.

Thermal Resistance "R" Value
  • R = L K
  • Where 'L' = Thickness of Insulation material (m)
  • 'K' = Thermal Conductivity (W/m ℃)
  • R = m2 ℃/W or hr.ft2. ℉ /Btu
  • R-Value is a measure of the resistance to heat flow of a material of any given thickness
Non Combustible

Prevent fire risks from the content of the services and protecting HVAC equipment from external fire damage.

High noise attenuation properties

Offers exceptional acoustic properties and enhances indoor environmental quality by absorption of mechanical noise generated by air conditioning equipment.

Condensation control

appropriate thickness of Insulation as per ambient temperature & relative humidity is used. The moisture carrying capacity of the air is related to its temperature.

When moist warm air comes into contact with cold surfaces eg. Pipe and ducts, the air is cooled and will produce precipitation on the cold surface.

Health issues/quality of indoor air

Fiberglass wool has no health hazard in any normal conditions. International Agency for Research on Cancer (IARC) monographs /WHO report (2002) explicitly states that glass wool is not carcinogenic to humans.

Facings

TWIGA Insul Duct wrap is available with a wide range of factory applied facings, FSK, Tough Guard, and Black Woven Glass Cloth & FGT.

Thermal Properties

Significantly reduces heat gain & losses.

Fire Properties

Non Combustible tested as per BS 476 part 4 and ISO 1182, IS 3808 & IMO (FTP)

Durability
  • Odorless, inert and fully compatible with all standard building material components
  • Does not encourage growth of fungi & vermin.
  • Non Hygroscopic
Tools needed for Installation

Tape Measure, sharp knife/blade, straight edge & strapping equipment

Installation Guidelines

The duct should be covered with two coats of cold applied bitumen/CPRX or any other equivalent approved product after cleaning the surface & sealing all joints against leakages.

The insulation of specific R-value and thickness should then be cut to appropriate length and stuck to the duct while the adhesive is still wet.

All longitudinal joints and circular overlaps should be sealed with aluminium foil tape (50mm width) to make the installation leak proof. For large ducts, where adhesive pins have been used, speed washers/clips should be covered completely with Aluminium foil- tape to have an air-tight finish.

The insulation should then be secured over the duct using mechanically fastened nylon/steel straps (12mm/50mm) at appropriate intervals (max 1.2m).

For ducts having width greater than 0.6m, heavy duty self- pins are to be applied to the duct at appropriate intervals (max 300mm)

Handling & Storage

Store product undercover and in dry conditions. Store flat. Handle with care, especially on the edges and corners, which can be damaged if subject to sharp or heavy impact.

Architectural Specification

Insulation material for Duct Wrap shall be lightweight blanket of non combustible Bonded Fiber Glass Wool Insulation - Supply Duct- having thermal resistance R 1.4 (24KG/m3-50 mm), Return Duct - R 0.6 (24kg/m3-25mm) suitably factory laminated with appropriate vapour barriers as per the ECBC/ASHRAE standards.

Insulation Pins


Perforated Base Insulation Pin with a Self-Locking Washer are used to support either batt insulation or rigid board insulation on walls, ceilings or roof applications. The insulation pin has a 25mm x 25mm perforated base comes in 38mm and 65mm lengths. Self-locking washer is placed at the end of the nail to insure that the batt or board stays in place. When using adhesive to secure the anchors, the adhesive should be maintained at room temperature. The spindle pin installation should be completed and the glue should be given about 24 hours before the batts or boards are impaled.

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