Radenshield™Radiant Barriers and Undertile membranes form part of the Coverland range of high quality underlays designed to increase the performance of your roof. These underlays are fixed below the roof covering and each product variant offers its own unique performance features. As with all Coverland products, the range of underlays are tested for quality and long-term durability in the Group testing facility in Germany and they are Agrément certified.

ROOF UNDERLAY PORTFOLIO

ROOFS THAT LAST

Unique Performance FeaturesCoverland Radenshield™ Radiant Barriers and Undertile Membrane are installed over the roof truss, under the roof battens and directly beneath the roofi ng tiles.

RADENSHIELD™ ALUMINIUM RADIANT BARRIER

The RadenShield™ Radiant Barriers are a range of highly refl ective (97%) aluminium roofi ng membranes that provide the added benefi t of refl ective insulation. RadenShield™ Radiant Barriers are a recommended component for compliance with the SANS 204 Energy Effi ciency in Buildings Standard.

UNDERTILE MEMBRANE

Developed as a high-end alternative to plastic underlays, the Coverland Undertile Membrane range provides superior protection against wind, water and dust penetration.

The importance of a high performance roof underlay

The most important environment factor which affects the satisfactory performance of roofs is wind gusting. Wind tunnel tests and practical evidence have shown that the satisfactory performance of a roof, particularly a tiled roof, depends on the complimentary function of the roof covering and the undertile membrane.

During short-term wind gusts, pressure differences occur between the roof space (loft) and the outside roof covering. The result is a wind force that causes the total or partial removal of the roof covering allowing further damage by natural elements. Roof pitches below 30° results in suction on both the windward and leeward sides of the roof.

If tiles are not properly fixed and there is no or a low performing underlay laid in the roof structure, it may result in damage to both the exterior and interior of the roof. The working performance of the roofing undertile membrane substantially reduces the lifting forces in the roof covering. An undertile membrane is an essential component of a pitched roof and is considered an investment and insurance for a weather-tight roof. A roof structure that is fitted with Coverland Undertile membrane or Radenshield™, and is tiled according to the required specifications, will withstand excessive wind speeds and assure additional benefits unique to the product range.

CoverlandUnderlay

Radenshield™ and Undertile Membrane offer resistance against strong wind penetration.

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BENEFITS• Higher comfort levels at a lower cost

RadenShield™ reduces indoor temperature by up to 10°C by reflecting up to 97% radiant heat and reducing the entry of external, convective heat. It does this by reducing the radiant heat transfer from the underside of the roofing system to the other surfaces in the ceiling. It will also act as a barrier to retain warmth in your home in winter, which would ordinarily escape through the roof. This reduces the use of air conditioners and/or additional cooling/warming appliances.

Undertile Membrane assures an increase in thermal insulation resulting in energy savings during winter and summer.

• Increased roof performance Reduces pressure variances, decreasing the risk of tile or roof sheeting from taking off in windy conditions.

• Increased water-tightness Reduces water suction caused by windy conditions and pressure variance.

• Enhanced protection Prevents dust, sand, pollen and insects accumulating in the roof cavity and penetrating the interior of the home.

• Easy to use Unique bonding process prevents delamination and tearing, yet is flexible enough for quick and easy installation.

• Compliance with SANS 204 Energy Efficiency in Buildings regulation Acceptable component for SANS 204 Standard. Refer to Product Guideline for Thermal Insulation pg 9.

RESIDENTIAL RADENSHIELD™High performance aluminium radiant barriers for tiled-roof buildings with timber roof construction.

24˚C 33˚C 20˚C 15˚C

Cool in Summer Cosy in Winter

24˚C 33˚C 20˚C 15˚C

Cool in Summer Cosy in Winter

PRODUCT DATACertification 2009/366Length 30 linear metresWidth 1.5 linear metresRoll Coverage 45 m²Effective Coverage 40.5 m²Weight 126 g/m²Mass 5.7 kgTensile Strength MD 180 N/50 mm (EN12311-1)

CD 180 N/50 mm (EN12311-1)Average Nail Tear Strength MD 120 N (EN12310-1)

CD 120 N (EN12310-1)Water Resistance Waterproof barrier and vapour impermeableFire Rating B/B3/3R-value 1.05 (m²K)/W

PRODUCT DATACertification 2009/387Length 33.33 linear metresWidth 1.5 linear metresRoll Coverage 50 m²Effective Coverage 45 m²Weight 220 g/m²Mass 6.35 kgTensile Strength MD 300 N/50 mm (EN12311-1)

CD 240 N/50 mm (EN12311-1)Average Nail Tear Strength MD 250 N (EN12310-1)

CD 270 N (EN12310-1)Water Resistance Waterproof barrier and vapour impermeableFire Rating B/B1/2R-value 1.57 (m²K)/W

PRODUCT DATACertification 2009/369Length 30 linear metresWidth 1.5 linear metresRoll Coverage 45 m²Effective Coverage 40.5 m²Weight 172 g/m²Mass 7.8 kgTensile Strength MD 200 N/50 mm (EN12311-1)

CD 180 N/50 mm (EN12311-1)Average Nail Tear Strength MD 150 N (EN12310-1)

CD 150 N (EN12310-1)Water Resistance Waterproof barrier and vapour impermeableFire Rating B/B1/2R-value 1.59 (m²K)/WK-value 0.0630 W/mK

PRODUCT DATACertification 2009/367Length 33.33 linear metresWidth 1.5 linear metresRoll Coverage 50 m²Effective Coverage 45 m²Weight 220 g/m²Mass 11 kgTensile Strength MD 300 N/50 mm (EN12311-1)

CD 240 N/50 mm (EN12311-1)Average Nail Tear Strength MD 250 N (EN12310-1)

CD 270 N (EN12310-1)Water Resistance Waterproof barrier and vapour impermeableFire Rating SANS 428 – B/B1/2/H&V (SP & USP)R-value 1.57 (m²K)/W

INDUSTRIAL RADENSHIELD™High performance aluminium radiant barriers for buildings with galvanised sheet cladding or tiled-roof buildings.

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1 Reflective Aluminium Foil2 Bonding Layer3 Non-woven Carrier4 Coating

PRODUCT DATACertifi cation 2012/425Length 33.33 linear metresWidth 1.5 linear metresRoll Coverage 50 m²Eff ective Coverage 45 m²Weight 182 g/m²Mass 9.1 kgTensile Strength MD 300 N/50 mm (EN12311-1)

CD 240 N/50 mm (EN12311-1)Average Nail Tear Strength MD 250 N (EN12310-1)

CD 270 N (EN12310-1)Water Resistance Waterproof barrier and vapour impermeableFire Rating SANS 428 – B/B1/2/H&V only (SP)R-value 1.05 (m²K)/W

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PRODUCT DATAMaterial 2-ply laminate of 80 g/m² white or black,

20 g/m² PolypropyleneGrammage 100 g/m²Length 30 m 45 mWidth 1.5 m 1.5 mWeight 4.5 kg per roll 4.5 kg per rollCoverage 40.5 m² with an

overlap of 150 mm60.75 m² with an

overlap of 150 mmTensile Strength 180 NewtonsAverage Nail Tear Strength 80 NewtonsCertifi cation 2011/384, NHBRC approved Water Resistance Waterproof barrier and vapour impermeable

UNDERTILE MEMBRANEMoisture, wind and dust barrier.

PRODUCT DATAMaterial 3-ply laminate of 50 g/m² blue,

20 g/m² Polypropylene, 30 g/m² BlackGrammage 100 g/m²Length 30 mWidth 1.5 mWeight 4.5 kg per rollCoverage 40.5 m² with an overlap of 150 mmTensile Strength 200 NewtonsAverage Nail Tear Strength 80 NewtonsCertifi cation 2011/384, NHBRC approvedWater Resistance Waterproof barrier and vapour impermeable

RADENSHIELD™ DOUBLE-SIDED BENEFITS Use less bulk insulation volume (75mm compared to 135mm) Material cost saving of 25% Performance of R-Value 3.96m²K/W (in conjunction with 75 mm

bulk fibre) Thermal Conductivity – K-Value = 0.0630 W/mK

135mmInsulation

Ceiling

Membrane

Roof Tiles

75mmInsulation

Radenshield™Double-sided

Ceiling

Roof Tiles

97% Reflectance

Fig. 1: Membrane used with 135 mm insulation = total R-Value of 3.87 m² K/W

Fig. 2: Radenshield™ Double-Sided Aluminium Radiant Barrier with 75 mm insulation = total R-Value of 3.96 m² K/W

Product guideline for Thermal Insulation

SANS 204 Energy efficiency in buildings

Coverland RadenShield™ Double-sided Radiant Barrier is a highly reflective insulation that comfortably achieves the required thermal resistance applicable when installed with bulk fibre (Fig. 2). It plays an integral part in keeping the building warm in winter and cool in summer. Energy consumption is then reduced with less frequent use of cooling and heating appliances.

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INSULATION LEVELS PER CLIMATIC ZONE R-Value is a measure of thermal resistance. It measures an insulation material’s ability to reduce the rate of heat flow under specified test conditions. SANS 204 ‘Deemed-to-Satisfy Provisions’ are based on six climatic zones, shown on the map. In order to achieve these results, the roof must achieve the Total R-Value specified in the chart below. The correct insulation specification creates a significant impact on achieving the appropriate R-value for each zone. When comparing traditional roof membrane application, Radenshield™ Double-sided Radiant Barrier achieves the required R-Value using less bulk insulation volume.

REQUIREMENTS FOR EACH CLIMATE ZONE

Climate zones 1 2 3 4 5 6

Climatic conditions Cold interior

Template interior Hot interior Temperate

coastalSub-tropical

coastalArid

interior

Minimum required Total R-Value (m²K/W)* for roof solar absorption of more than 0.55

3.7 3.2 2.7 3.7 2.7 3.5

Direction of heat flow Up Up Down & up Up Down Up

ILLUSTRATED SAVINGS

Roof space 0.49 0.49 0.49 0.49 0.49 0.49

100 mm insulation + membrane (0m²K/W) - - 2.5 - 2.5 -

115 mm insulation + membrane (0m²K/W) - 2.88 - - - -

135 mm insulation + membrane (0m²K/W) 3.38 - - 3.38 - 3.38

Total R-Value with Traditional insulation 3.87 3.37 2.99 3.87 2.99 3.87

Roof space 0.49 0.49 0.49 0.49 0.49 0.49

50 mm insulation + single-sided Radenshield™ - - 2.30 - 2.30 -

75 mm insulation + single-sided Radenshield™ - 2.93 - - - -

75 mm insulation + double-sided Radenshield™ 3.47 - - 3.47 - 3.47

TOTAL R-VALUE including Radenshield™ 3.96 3.42 2.79 3.96 2.79 3.96

Estimated Cost Saving 25% 15% 33% 25% 33% 25%

Total R-Values are based on the sum of all components of the building system including indoor and outdoor air films, building materials used in the system and air spaces. Assuming a 200m² home with roof pitch of 26 degrees – Ceiling: 200m² / Roof: 231m². Savings may vary based per current market values and are not guaranteed.

PROJECT SAVINGSSince less insulation is required, the project costs are reduced and output increased. The chart above illustrates the percentage saving based on material standards for each climatic zone.

Cost Reduction: Handling costs, storage, labour and transport. Ease of handling: Less bulk product to manage.

CLIMATIC ZONE MAP

Masina

Makhado

Phalaborwa

Polokwane KrugerNationalPark

NelspruitPretoriaCenturion

Mmabatho SowetoMidrand

JohannesburgVereeniging

KroonstadWelkom

Virginia

Bloemfontein

Kimberly

Upington

UlundiSt Lucia

Richards Bay

Durban

Pietermaritzburg

Drakensburg

MiddleburgUmtata

Port St Johns

East london

Port ElizabethMossel Bay

George

Cradock

Uitenhage

Sutherland

Worcester

StellenboschCape Town

Saldnha Bay

Alexander Bay

Port Nolloth

Calvinia

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5

6

Cold interior

Template interior

Hot interior

Temperate coastal

Sub-tropical coastal

Arid interior

Zone Climatic Conditions

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Installation Guide

DOMESTIC / COMMERCIAL / LIGHT INDUSTRIAL INSTALLATION

APPLICATION• Unroll underlay and install horizontally, from left to right, across the rafters and starting at the eaves. Work towards the

ridge of the roof (1a). The upper side of the underlay is marked with the Coverland logo and a dotted line indicating the minimum overlap between layers of 150mm.

• Ensure each horizontal layer is placed across the rafters in such a way as to avoid sagging, creases and/or gaps. Tack-nail into position and secure using through-nail horizontal battens. Avoid unnecessary tears/penetrations through the underlay.

• Minimum recommended width of horizontal overlap is 150mm (1b). Horizontal overlaps should be secured under a batten. Ensure vertical joints overlap by a minimum of 150mm and that they are secured to a rafter (2a). Corrosion-resistant staples or E.P. clout nails are recommended.

• The underlay between the trusses must be sufficiently taut, while allowing a shallow through to facilitate run-off beyond the wall or into the gutter, should rain water penetrate the tiles (2b).

• Layers of underlay that run over a hip should overlap by a minimum of 150mm. Each layer should overlap the layers of underlay on the adjacent elevation of the roof.

• Ensure that a layer of DPC is applied over the underlay at roof ridges, hips and at the roof’s apex.• Ensure that a layer of underlay at least 600mm wide is laid in the roof’s valleys before the final layers of underlay are laid.

Secure these strips beneath valley battens, ensuring that the final underlay layer is laid over these battens.

PLEASE NOTECoverland underlay provides adequate resistance to tearing and perforation, however it is not designed to withstand the weight of building contractors/roof erectors and tiles. Building materials and/or equipment should not be placed on the membrane. Battens must be installed as work progresses from eaves to ridges, to facilitate space for workmen to step, and to avoid unnecessary damage to the underlay.

STORAGE AND HANDLING• Coverland underlay should be stacked right side up on a level surface, preferably under cover. Avoid contact of underlay

with sharp objects.• To maintain its longevity, it is not recommended that unwrapped underlay be exposed to UV light for prolonged periods.

Reasonable precautions must be taken in handling and unwrapping the rolls of underlay to prevent tears, perforations and damage prior to installation.

• As a fundamental part of the roof structure, Coverland underlay is not designed for direct, outside exposure. Hence, it is recommended that the underlay is covered with the desired roof cover as soon as possible after installation.

REPAIRSOverlay the damaged area with an additional layer of Coverland underlay, ensuring a 150mm overlap all round. Ensure that the up-slope side overlaps the subsequent, higher horizontal layer of membrane and secure under a batten.

RAFTERS

TILING BATTEN

1a

2b

1a1

CONCRETE ROOF TILES

UNDERTILE MEMBRANES AND RADIANT BARRIER MEMBRANES

2a

1b

Fig 3: Diagram illustrating steps to laying undertile membranes and radiant barrier membranes over the roof truss under the tiles

338 338 338 7575 350 350 350 5050

apex/ridge purlin

straining wires

truss

eave purlin

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INDUSTRIAL INSTALLATION

APPLICATION• Refer to diagrams A, B, C and D. Polyvinyl chloride (PVC) coated straining wires are secured from the top apex purlin, over

intermediate purlins to the bottom eave purlin at 338mm centres (1b).• The first straining wire is secured 75mm away from the gable end. All wires are evenly tensioned ensuring that cut ends

face downwards.• Note: All other applications to comply with the National building regulations and codes of practice.• Radenshield™ is laid over the straining wires (2a) ensuring that it is squared off to the underlay and is secured to the apex

purlin using double-sided tape (2b). The underlay is evenly tensioned and secured to the eaves purlin again using double sided tape.

• All subsequent layers of Radenshield™ are to be fixed as above with a not less than 100mm overlap over the previous sheet. Straining wires must be positioned at the centre of the overlaps and not less than 50mm from the sheet edges.

PROTECTION • Store under cover and when removed from packaging, install Radenshield™ as soon as possible and cover with the tiles as

soon as practicable.• Protection is required against traffic on the ground, during storage, during the installation process and once installed.

STORAGE• On site, keep out of direct sunlight and stored right side up on a raised, flat surface free of sharp protrusions.

1a

PURLINS

PVC STRAINING WIRES

STEEL STRUCTURE

1b2b

2a

3

4

METAL ROOF COVERING

RADIANT BARRIER MEMBRANES

Min. 100mm

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Fig 5: Diagram of laying Radenshield™ on straining wires

Fig 4.1: Diagram A – 150mm sidelap jointStraining wire central to overlapping

Fig 4.2: Diagram B – 100mm sidelap jointStraining wire central to overlapping

Fig 4.4: Diagram D – Laying

Fig 4.3: Diagram C – Laying over the straining wire and fixing to the apex

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truss

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ROOFS THAT LASTwww.coverland.co.za | info.sa@monier.com

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