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Product Information

Kingspan TR21, from the Thermaroof Range ...

Kingspan Thermaroof TR21 insulation boards for use beneath partially bonded built-up felt and mastic asphalt

High performance rigid urethane insulation with a thermal conductivity of between 0.025-0.027 W/mK

Kingspan Thermaroof™TR21is designed for use with most bitumen based waterproofing systems, including high performance types which incorporate a Type 3G perforated base layer to BS 747: 2000 (Reinforced bitumen sheets for roofing ... Specification). The 3G felt layer is laid dry and loose,mineral face down with a fully bonded perimeter zone.

The roof waterproofing should be applied as soon as possible after the laying of the boards. The built–up roof specification should be laid where applicable in accordance with BS 8217: 2005 (Reinforced bitumen membranes for roofing ... Code of practice).

It is also suited to mastic asphalt waterproofing systems. The mastic asphalt roof specification should be laid where applicable in accordance with BS 8218: 1998 (Code of practice for mastic asphalt roofing).

Mastic asphalt should always be laid over an isolating layer of Type 4A sheathing felt to BS 747: 2000.

Benefits

High performance rigid urethane insulation – thermal conductivity0.025–0.027 W/m²

Fully compatible with most bitumen based and mastic asphalt waterproofing systems

Can accommodate partially bonded roofs up to a 10°pitch

Unaffected by temperatures associated with mastic asphalt(up to 240°C)

No need for a fibreboard overlay– asphalt with sheathing felt can be laid directly on top of the insulation

Resistant to the passage of water vapour

Easy to handle and install Ideal for new build and refurbishment

Non–deleterious material CFC/HCFC–free with zero Ozone Depletion Potential (ODP)

Applications

Roof insulation below partially bonded built-up felt and mastic asphalt, other than Insulated balconies waterproofed with mastic asphalt with a porous promenade tile overlay.

Kingspan TR21 Board Sizes and Values

Available in in the standard size of 600mm wide by 1200mm long, and in the following thicknesses ...

Thermaroof TR21	R Value (mK/W)	Thermal Conductivity (W/mK)	U-Value (W/mK)	Weight (kg per m²)	Compressive strength (kPa)	Water vapour resistance (MNs/g)	Reaction to fire BS 476Ð3: 1958
TR21 30	1.10	0.027	0.91	1.48	> 150	> 15	FAA rating
TR21 50	1.85	0.027	0.54	2.12	> 150	> 15	FAA rating
TR21 60	2.20	0.027	0.45	2.44	> 150	> 15	FAA rating
TR21 65	2.40	0.027	0.42	2.60	> 150	> 15	FAA rating
TR21 70	2.55	0.027	0.39	2.76	> 150	> 15	FAA rating
TR21 75	2.75	0.027	0.36	3.08	> 150	> 15	FAA rating
TR21 80	3.05	0.026	0.33	3.24	> 150	> 15	FAA rating
TR21 85	3.25	0.026	0.31	3.40	> 150	> 15	FAA rating
TR21 90	3.45	0.026	0.29	3.56	> 150	> 15	FAA rating
TR21 100	3.80	0.026	0.26	3.72	> 150	> 15	FAA rating

Note:

R-Value = Thermal Resistance; Thermal Conductivity = Lambda Value; U-Value = Thermal Transmittance Co-efficient; Compressive strength = kiloPascals; Vapour resistance = MegaNewton seconds per gram.

Technical Specifications

Kingspan Thermaroof™TR21 roof insulation comprises a CFC/HCFC–free rigid urethane insulation core with bitumen impregnated glass tissue facings on both sides manufactured to the highest standards in accordance with both the requirements of BS 4841–3 and quality control systems approved to BS EN ISO 9001: 2000 /I.S. EN ISO 9001: 2000 by Kingspan Insulation Limited and shall be applied in accordance with the instructions issued by them.

Falls

The fall on a flat roof should be smooth and steep enough to prevent the formation of rainwater pools. To ensure adequate drainage, BS 6229: 2003 (Flat roofs with continuously supported coverings. Code of practice), recommends uniform gradients of not less than 1 in 80. The fall on a flat roof constructed using Kingspan Thermaroof™TR21is normally provided by the supporting structure being directed towards the rainwater outlets. However, because of building settlement,it is advisable to design in even greater falls. These can be provided by the use of a Kingspan Insulation Tapered Roofing System. Further details of the Kingspan Thermataper®System and a complete design service are available from the Kingspan Insulation Tapered Roofing Department (see rear cover).

Water Vapour Control

Kingspan Thermaroof™TR21should be installed over separate vapour control layer. A minimum vapour control layer should consist of a coated roofing felt complying with BS 747: 2000 Type 3B, or any appropriate metal–cored vapour control layer. Allowance should be made for the adequate bonding of the vapour control layer to the deck so as to provide a suitable surface for Kingspan Thermaroof™TR21to be laid upon, and sufficient resistance to wind up–lift(see ‘Wind Loading’).

Roof Loading

Depending on the chosen waterproofing system, Kingspan Thermaroof™TR21is suitable for use on access roof decks subject to limited foot traffic. Where continuous or excessive loadings are liable to occur it is recommended that the roof surface is protected by promenade tiles. The roof should be adequately protected when building works are being carried out on or over the roof surface. This is best achieved by close boarding. The completed roof must not be used for the storage of heavy building components such as bricks or air conditioning equipment.

Spanning on Metal Decks

The designer’s attention is drawn to the requirement that insulation boards comply with the minimum thicknesses shown in the table below, when used over metal decks with trough openings as shown.

Trough Opening ≤75mm - Minimum Insulant Thickness 25mm

Trough Opening 76–100mm - Minimum Insulant Thickness 30mm

Trough Opening 101–125mm - Minimum Insulant Thickness 35mm

Trough Opening 126–150mm - Minimum Insulant Thickness 40mm

Trough Opening 151–175mm - Minimum Insulant Thickness 45mm

Trough Opening 176–200mm - Minimum Insulant Thickness 50mm

Vapour Control

Layer Metal decks and concrete decks should be primed in accordance with the appropriate manufacturers instructions prior to the application of the hot bitumen or suitable alternative proprietary adhesive system used to bond the vapour control layer to the deck. The specified vapour control layer should be continued 250 mm past the insulation abutting the parapet and sealed.

Fixing over Metal Decks

On metal decks, Kingspan Thermaroof™TR21should be laid into hot bitumen (max. temperature 240°C) mopped or poured over the vapour control layer. The boards should be laid break–bonded, either with the long edges at right angles to the trough openings or diagonally across the corrugation line .Whichever system is chosen, care must be taken to ensure that all joints are supported by the deck. The joints should be lightly butted.

Fixing over Concrete Decks

Concrete decks should be clean, dry, without large projections,steps or gaps, and should be graded to allow correct falls to all rainwater outlets. To ensure an adequate bond between the vapour control layer and the concrete deck, the concrete or screeded surface should be suitably primed, in accordance with the specified manufacturer’s instructions. The vapour control layer should be fully bonded to the deck and similarly the Kingspan Thermaroof™TR21to the vapour control layer by laying into hot bitumen mopped or poured over the vapour control layer. The boards should be laid break–bonded with all joints lightly butted. Fixing over Plywood Decks Kingspan Thermaroof™TR21should be fully bedded in hot bitumen over a continuous vapour control layer which has been nailed or bonded to the deck with laps at the side and end sealed with hot bitumen. The boards should be laid break–bonded, either with the long edges at right angles to the edge or diagonally across the roof. Joints should be lightly butted.

Fixing over Tongue & Groove Decks

On timber tongue and groove decks, the vapour control layer should be nailed. During the laying of Kingspan Thermaroof™TR21the nail heads will become sealed in hot bitumen to the vapour control layer by the subsequent bonding of the roof board. The Kingspan Thermaroof™TR21is then applied as described under plywood decks.

Fixing over Woodwool Decks

Woodwool decks should be clean and free of large projections, steps or gaps and should be graded to allow correct falls to all rainwater outlets. Kingspan Thermaroof™TR21should be fully bedded in hot bitumen over a continuous vapour control layer. Boards should be laid diagonally across the roof, or with their long edges at right angles to the slabs. Board joints should not coincide with those of the slabs. The boards should be laid break–bonded, either with the long edges at right angles to the edge or diagonally across the roof. Joints should be lightly butted. Board joints should not coincide with those of the slabs.

Fixing Two Layer Systems

In situations where two layers of insulation are required, both layers of insulation should be installed in the same manner, which varies according to the deck type (as detailed above). In all cases, the two layers should be horizontally offset relative to each other so that no two board joints in the two layers coincide with each other.

Reflective coatings

Bitumen based built up waterproofing systems laid over Kingspan Thermaroof™TR21 should always incorporate a solar reflective layer such as chippings or specialist coatings.

Daily Working Practice

At the completion of each day’s work, or whenever work is interrupted for extended periods of time, a night joint must be made in order to prevent water penetration of the roof construction.

Cutting

Cutting should be carried out either by using a fine toothed saw, or by scoring with a sharp knife, snapping the board over a straight edge and then cutting the facing on the other side. Ensure accurate trimming to achieve close–butting joints and continuity of insulation.

Downloads - select from drop-down menu below

Select from drop-down menu Kingspan Quick Guide Product Data Sheet - K3 Product Data Sheet - K5EWB Product Data Sheet - K7 Product Data Sheet - K8 Product Data Sheet - K10 Product Data Sheet - K11 Product Data Sheet - K12 Product Data Sheet - K15 Product Data Sheet - K17 Product Data Sheet - K18 Product Data Sheet - TF73 Product Data Sheet -TP10 Product Data Sheet - TR21 Product Data Sheet - TR22 Product Certification - TP10 Product Certification - K3 Product Certification - K7 Product Certification - K8 Product Certification - K12 Product Certification - K15 Product Certification - TF73 Product Certification - TR21

Manufacturer's Contact Details

Kingspan Insulation Limited
Pembridge, Leominster, Herefordshire, HR6 9LA

Kingspan Technical Advisory. Tel: 0870 850 8333
Fax: 01544 387 278 - techline.uk@insulation.kingspan.com

This page was last updated: Wednesday, February 1, 2012

Kingspan TR21 from as little as £5.38m² - £3.88 per board

Prices effective on all deliveries from September 30, 2010, onwards.

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