Thermal insulation

From foundation to roof, DCTech has an insulation solution for every area of your building, all designed to help manage energy efficiency, moisture resistance and durability issues that can compromise your buildings long term performance. Below is our product guide that allows you to match the best material to suit your application. If you don’t see what you are looking for, give our office a call on 1800 051 100.

Extruded Polystyrene (XPS) Thermal Insulation 
Product GuideApplications
DCT XPS Block
  • Cold store floors
  • Cold roof
  • Cold bridge insulation
  • External render or cladding
  • Plasterboard laminate
  • Refrigerated truck panels
  • Composite building panels
DCT GA 300
Tongue & Groove
  • Exterior walls
  • Ceilings
  • Exterior foundation walls
  • Interior foundation walls
  • Under or over ground bearing concrete slabs
  • Crawl space
HD-X
Dow Styrofoam High Density
  • Cold store floors
LB
Dow Styrofoam 
  • Cold store floors
  • Cold roof
  • Cold bridge insulation
  • External render and/or cladding
  • Plasterboard laminate
  • Refrigerated truck panels
  • Composite building panels
SMTG
Dow Styrofoam Tongue & Groove 
  • Exterior walls over studs or non-insulating sheathing
  • Ceilings
  • Interior and exterior foundation walls
  • Under or over ground bearing concrete slabs
  • Crawl spaces
RTM-X
Dow Styrofoam refrigerated transport 
  • Core material in sandwich panels for the walls, floors, roofs and doors in refrigerated trucks and containers
  • High load-bearing floors such as cold stores, warehouses and parking areas
  • Under or over ground bearing concrete slabs
  • Suspended beam and block or timber floors
Roofmate-X
Dow Styrofoam
  • IRMA (upside down roof)
  • Heavyweight decks with a ballast layer of gravel or concrete slabs
  • timber decking and paving
  • roof gardens
Deckmate Strips
Dow Styrofoam
  • Metal deck roofing applications
Polyisocyanurate (PIR) Thermal Insulation
Product GuideApplications
DCT PIR White
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
DCT PIR Silver
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
DCT PIR Tissue
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
Tuff-R
Dow PIR 
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
Thermax Light Duty
Dow PIR  
  • Interior finish system for walls and ceilings in metal, wood, post frame, concrete and masonry buildings
Thermax Heavy Duty
Dow PIR 
  • High impact interior finish systems for walls in metal, wood post frame, and concrete or masonry buildings
Vacuum insulated panels thermal insulation 
va-Q-vip
VIP 
  • Thin profile for confined spaces
  • Thermal packaging (medical transport boxes, etc)
  • Appliances (Water boiler, etc)
  • Automotive (train, ships, aerospace, etc)
va-Q-vip B
VIP 
  • Interior insulation in ceilings, walls, floors, flat roofs, top floor ceilings
  • Wood frame construction
  • Exterior insulation behind panelling
va-Q-floor F
VIP 
  • Floor insulation
va-Q-vip F
VIP 
  • Facade insulation

 

Insulated Laminated Plasterboard Panels 
Product GuideApplications
Thermalcheck
DCTech XPS + Plasterboard 
  • Commercial retrofit interior wall and ceiling liner for high impact traffic areas
  • Residential retrofit interior wall and ceiling liner for high humidity areas such bathrooms
  • Effective vapour barrier
Thermalcheck Super
DCTech PIR + Plasterboard 
  • Commercial retrofit interior wall and ceiling liner for moderate impact traffic areas

Styrofoam™ has been manufactured by Dow for more than 50 years. The process of extruding foamed polystyrene results in a rigid material with uniformly small, sealed cells, a fashioned ‘skin’ and a unrivalled set of insulation properties which makes Dow Styrofoam™ the choice of thermal insulation for specifiers in a wide range of demanding residential, commercial and transport applications.

Extruded Polystyrene (XPS) Thermal Insulation 
Product GuideApplications
DCT XPS Block
  • Cold store floors
  • Cold roof
  • Cold bridge insulation
  • External render or cladding
  • Plasterboard laminate
  • Refrigerated truck panels
  • Composite building panels
DCT GA 300
Tongue & Groove
  • Exterior walls
  • Ceilings
  • Exterior foundation walls
  • Interior foundation walls
  • Under or over ground bearing concrete slabs
  • Crawl space
DCT GA 400
Tongue and groove
  • Exterior walls
  • Ceilings
  • Exterior foundation walls
  • Interior foundation walls
  • Crawl space
HD-X
Dow Styrofoam High Density
  • Cold store floors
LB
Dow Styrofoam 
  • Cold store floors
  • Cold roof
  • Cold bridge insulation
  • External render and/or cladding
  • Plasterboard laminate
  • Refrigerated truck panels
  • Composite building panels
SMTG
Dow Styrofoam Tongue & Groove 
  • Exterior walls over studs or non-insulating sheathing
  • Ceilings
  • Interior and exterior foundation walls
  • Under or over ground bearing concrete slabs
  • Crawl spaces
RTM-X
Dow Styrofoam refrigerated transport 
  • Core material in sandwich panels for the walls, floors, roofs and doors in refrigerated trucks and containers
  • High load-bearing floors such as cold stores, warehouses and parking areas
  • Under or over ground bearing concrete slabs
  • Suspended beam and block or timber floors
Floormate-X
Dow Styrofoam 
  • Under concrete slab, slab on ground
  • Hydronic floor heating
  • Geo-engineering backfill to protect civil engineering projects from freezing
Roofmate-X
Dow Styrofoam
  • IRMA (upside down roof)
  • Heavyweight decks with a ballast layer of gravel or concrete slabs
  • timber decking and paving
  • roof gardens
DCT XPS Thermal Break Strips
  • Metal deck roofing applications
SP-X
Dow Styrofoam 
  • Non-porous, closed cell
  • High performance extruded polystyrene, general application.
  • Floor, wall and roof applications

EPS vs XPS insulation

Based on a Canadian study that looked at the long-term performance of EPS in ground contact, the manufacturers of EPS in North America and Canada started claiming that it was just as suitable for ground use as XPS. Later industry-sponsored research went further and, based on evidence of in-service failures with roof decks, claimed that XPS did not perform in practice the same as it did in laboratory tests and therefore EPS was in fact superior. The XPS industry has countered that with research of their own. It is interesting to note that the emphasis from the XPS industry has shifted from low moisture uptake, as happens with the laboratory immersion and moist air testing regimes, to the moisture vapour diffusion properties of XPS.

The examples of XPS failure appear to be mostly related to complicated roof deck situations and use in conjunction with less than perfect waterproof membranes. The weight of evidence is in favour of XPS being significantly more resistant to moisture uptake in ground contact when there is no deliberate provision for drainage around and under the insulation.

The traditional method of installing EPS perimeter insulation was in conjunction with drainage material backfill, polyethylene to protect the foam and a drain below the insulation. With XPS, only the polyethylene membrane is used. 

Both EPS and XPS have evolved with time. Blowing agents have changed and in the case of EPS the blowing agents are in the process of changing again. XPS in North America and Canada is now made without ozone-depleting blowing agents but this is not the case elsewhere. Some of the XPS products being imported into New Zealand appear to be made from slicing down of bulk stock rather than extruding at thickness with skins. The skins on XPS sheets slow down the ageing and are a major contributor to moisture properties. BRANZ has tested an XPS product with a thermal conductivity of 0.036 W/mK. In contrast, the carbon-infused EPS can have a conductivity significantly lower than that value. Much of the EPS manufactured in New Zealand include recycled content and the texture can sometimes be more porous.

It is important to allow moisture to diffuse out of the foam, so is not a good idea to try to fully encapsulate it in a waterproof protection. It is better to allow moisture diffusion out into the soil. During winter any moisture in the wall footing will be driven outward into the perimeter insulation so is best to use a vapour-permeable protection for the outside of the insulation. If that is not possible then the foam should extend below ground, only leaving the above-ground component with the moisture-impermeable protection layer. In general, the footing should not have a very high moisture content so the main risk is in the retrofit situation if water is transported up between the insulation and the concrete by the capillary. A capillary break such as a butyl strip may be needed at the bottom edge of the insulation.

EPS vs XPS Styrofoam

EPS vs XPS Styrofoam

 

Unique, tight closed cell structure of Styrofoam insulation leaves no voids between the cells.  The result: high compressive strength and unequalled resistance to water penetration.Cellular structure differences between extruded and expanded polystyrene (XPS and EPS) foam insulations.

PIR Insulation

Dow polyisocyanurate (PIR) thermal insulation features the highest insulation value of any foam sheathing currently available. Air cannot penetrate the facers, which also minimises water and water vapour intrusion into the foam insulation core, which allows the foam R-Value to stabilise at a higher value.

Product GuideApplications
DCT PIR White
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
 
DCT PIR Silver
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
DCT PIR Tissue
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
 
Dow Tuff-R
Dow PIR Insulation  
  • Car park soffits, concrete roofs
  • Double brick wall, cavity wall, double cavity precast wall, masonry wall external
  • Underside of slab
Thermax Light Duty
Dow PIR Insulation
  • Interior finish system for walls and ceilings in
    metal, wood, post frame, concrete and masonry buildings
Thermax Heavy Duty
Dow PIR Insulation
  • High impact interior finish systems for walls in metal, wood post frame, and concrete or masonry buildings

DCT Vento R – Non Combustible Insulation

Details

  • DCT Vento R is a non combustible mineral fibre insulation.
  • DCT Vento R is high density coated with the black glass voil facing.
  • DCT Vento R has good tensile strength, outer coating sheds water and is classified as a non combustible product, in core and composition.

Suggested Applications

  • Thermal and acoustic insulation of ventilated facades.
  • Acoustical absorption and insulation for perforated ceilings.
 SPECIFICATIONS           Test Method                  Units  
Thermal conductivity EN 13162 W/mk 0.038
 Fire Classification EUROCLASS A2 s1 d0
Short term water absorption Kg/m2 < 1
 Thickness Length (m)           Width R-Value Pack size coil m2
40mm 13.5600mm 1.116.20
50mm10.8m600mm1.312.96
60mm10.8m600mm1.612.96
80mm8.1m600mm2.19.72
100mm5.4m600mm2.66.48

Vacuum insulated panels

va-Q-vip is an evacuated micro porous thermal insulating panel with excellent insulating properties developed specifically for insulation applications where not much space is available but a high thermal resistance is necessary.

Vacuum insulated panels thermal insulation 
va-Q-vip
VIP 
  • Thin profile for confined spaces
  • Thermal packaging (medical transport boxes, etc)
  • Appliances (Water boiler, etc)
  • Automotive (train, ships, aerospace, etc)
va-Q-vip B
VIP 
  • Interior insulation in ceilings, walls, floors, flat roofs, top floor ceilings
  • Wood frame construction
  • Exterior insulation behind panelling
va-Q-floor F
VIP 
  • Floor insulation
va-Q-vip F
VIP 
  • Facade insulation

 

2-in-1 wall and ceiling lining system
Rigid insulation + plasterboard ideal for high humidity areas and areas with limited space.
Insulated Laminated Plasterboard Panels 
Product GuideApplications
Thermalcheck
DCTech XPS + Plasterboard 
  • Commercial retrofit interior wall and ceiling liner for high impact traffic areas
  • Residential retrofit interior wall and ceiling liner for high humidity areas such bathrooms
  • Effective vapour barrier
Thermalcheck Super
DCTech PIR + Plasterboard 
  • Commercial retrofit interior wall and ceiling liner for moderate impact traffic areas

Lightweight Structural Void Fill

STYROFOAM SOLUTIONS

Insulation of ground and installation works

INTRODUCTION

This brochure describes the frost insulation of ground and civil engineering works using STYROFOAM* extruded polystyrene insulation from Dow. It covers the principles, design considerations and installation methods for frost and permafrost insulation.

The recommendations contained in this brochure should always be considered in conjunction with guidance from the relevant authorities and any local regulations.

 

INSULATING GROUND WORKS

Sweden is a country with great climatic variations and temperature differences. The whole country is subject to ground frost, which in the North can reach depths of 2m. In some types of soil ground frost can produce frost heave – frost induced soil movement and expansion – which can damage roads, railways, service pipes and building foundations.

An effective method of protecting these structures is to insulate them with STYROFOAM, which reduces the risk of frost damage and cuts the associated repair and maintenance costs. This method of protection is often simpler and more cost effective than the alternative of forming deep gravel filled foundations.

STYROFOAM boards are available in several types and sizes, enabling designers to match the properties of the insulation to the intended use and the environmental conditions.

FROST INDEX

The severity of winter conditions is measured by the frost index, the total of daily average temperatures below freezing (number of days x temperature below zero, expressed in negative degree days). The map shows the climatic zones of Sweden based on the mean frost index.