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Kingspan TR31 for Rigid Ply Wood Bonded Flat Roof Boards

Kingspan's popular polyisocyanurate products are available in most popular thickness’s from the manufacturer, in which case short lead-times apply. The most popular board sizes may be available from stock.

This Thermaroof TR31 Range includes the following readily available product thickness's 50mm, 80mm and 120mm.
Manufactured to order are the following thickness's 70mm, 75mm, 80mm, 100mm, 105mm and 110mm

Product Functions

Kingspan Thermaroof TR31 flat roof boards

Kingspan TR31 structural insulation laminated to FSC certified plywood composite, for flat roofs waterproofed with partially bonded built–up felt

Common applications for this product include …
Between and Over Flat Roof Joists, plus Balconies and Terraces

Product Description

The Upper Facing

The upper facing of Kingspan Thermaroof® TR31 is an FSC certified, 6 mm nominal thickness, WBP exterior grade plywood, secondary bonded to the insulation core.

The Core

The core of Kingspan Thermaroof® TR31 is manufactured with Nilflam® technology, a high performance rigid thermoset polyisocyanurate (PIR) insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

The Lower Facing

The lower facing of Kingspan Thermaroof® TR31 is a low emissivity composite foil, autohesively bonded to the insulation core during manufacture. This reflective, low emissivity surface improves the thermal resistance of any unventilated cavity adjacent to the board.

Compressive Strength

The compressive strength of Kingspan Thermaroof® TR31 typically exceeds 150 kPa at 10% compression, when tested to BS / I.S. EN 826: 1996 (Thermal insulating products for building applications. Determination of compression behaviour).

Water Vapour Resistance / Resistivity

Adjusted for the effect of unsealed board joints, the non–plywood component of, the product achieves a resistance far greater than 100 MN.s/g, when tested in accordance with BS EN 12086: 1997 / I.S. EN 12086: 1998 (Thermal insulating products for building applications Determination of water vapour transmission properties).
When the joints between boards are sealed by the application of a continuous mastic sealant to the whole of the upper surface of the joists and cross noggins, a vapour resistance greater than 1000 MN.s/g can be achieved by the non–plywood component of the product.
For the purposes of calculation of condensation risk, the resistivity of the plywood component of the product should be taken as 520 MN.s/g.m

Resistance to Solvents, Fungi & Rodents

The insulation core is resistant to short–term contact with petrol and with most dilute acids, alkalis and mineral oils. However, it is recommended that any spills be cleaned off fully before the sheets are installed. Ensure that safe methods of cleaning are used, as recommended by the suppliers of the spilt liquid. The insulation core is not resistant to some solvent–based adhesive systems, particularly those containing methyl ethyl ketone. Adhesives containing such solvents should not be used in association with this product. Damaged sheets or sheets that have been in contact with harsh solvents

Fire Performance

Kingspan Thermaroof® TR31, when subjected to the British Standard fire test specified in the table below, will achieve the result shown, when waterproofed with 3 layer built–up felt and a loading coat of 10 mm chippings. For specifications without the chippings please consult the manufacturer of the mineral surfaced cap sheet for their fire classification details.


Product benefits

    High performance rigid thermoset insulation - thermal conductivity 0.022 W/m-K
    Insulation, vapour control layer and decking in one board

    Proven reputation as a quality composite roof deck
    Resistant to the passage of water vapour
    Easy to handle and install
    Ideal for new build and refurbishment
    Non-deleterious material
    Manufactured with a blowing agent that has zero ODP and low GWP


Product availability indicators

TR31 - Price and Availability Advisory:

Presently there are no availability restrictions, apart from manufacturing lead-times and minimum quantity order levels on the 70mm, 75mm, 80mm, 100mm, 105mm and 110mm boards

Excellent = Product Availability Excellent Good = Product Availability Good Fair = Product Availability Fair Poor =  Product Availability Poor Undetermined = Product Availability Undetermined
Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries


Technical Data

Kingspan TR31 Flat Roof, Ply Wood Bonded, Rigid PIR Insulation Boards

Product Code

Board dimensions

Thickness (mm)

λ Value (w/mK)

R-value (m²K/W)

U Value (W/m²K)

Weight (kg/m²)

Unit weight (kg)

Kingspan TR31 96mm 11 x 1.2m x 2.4m = 31.68m² 90 0.022 4.10 0.25 5.65 179.08
Kingspan TR31 106mm 10 x 1.2m x 2.4m = 28.8m² 100 0.022 4.55 0.22 5.97 172.00
Kingspan TR31 111mm 10 x 1.2m x 2.4m = 28.8m² 105 0.022 4.80 0.21 6.13 176.60
Kingspan TR31 116mm 9 x 1.2m x 2.4m = 25.92m² 110 0.022 5.00 0.20 6.29 163.08
Kingspan TR31 126mm 9 x 1.2m x 2.4m = 25.92m² 120 0.022 5.45 0.19 6.61 171.36
Thermal conductivity / Lambda value (W/mK) = 0.022 to 0.022 plus 0.140 | Compressive Strength (kPa) = > 150 | Water vapour resistance (MNs/g) = > 100 | Fire Performace = N/A | Please Note: R-Value = Thermal Resistance; U-Value = Thermal Transmittance Co-efficient; Compressive Strength = kiloPascals; Vapour resistance = Meganewton second gram

Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.


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Product Installation - Kingspan TR31

Falls

The fall on a flat roof, constructed using Kingspan Thermaroof® TR31, is normally provided by the supporting structure being directed towards the rainwater outlets. The fall should be smooth and steep enough to prevent the formation of rainwater ponds. In order 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. However, because of building settlement, it is advisable to design in even greater falls. These can be provided by a Kingspan Thermataper® LPC/FM tapered roofing system.

Roof Waterproofing

Kingspan Thermaroof® TR31 is suitable 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 should be laid dry and loose, mineral face down with a fully bonded perimeter zone.
Partially bonded built–up felt waterproofing should be laid, where applicable, in accordance with BS 8217: 2005 (Reinforced bitumen membranes for roofing. Code of practice).
It is possible to use Kingspan Thermaroof® TR31 with high performance bitumen based waterproofing systems which incorporate two layer fully bonded felts. When using Kingspan Thermaroof TR31 with fully bonded built–up felt nailing, prior to the installation of the waterproofing.
The fibreboard acts as a surface to allow full bonding of the built–up felt. Fully bonded built–up felt waterproofing should be laid, where applicable, in accordance with BS 8217: 2005 (Reinforced bitumen membranes for roofing. Code of practice).
It is also possible to use Kingspan Thermaroof® TR31 with mastic asphalt waterproofing systems.
When using Kingspan Thermaroof® TR31 with mastic asphalt, it is recommended that an overlay of 20 mm cork roofboard is fixed to the plywood surface of the sheets of Kingspan Thermaroof® TR31, using hot bitumen bonding or felt nailing, prior to the installation of the waterproofing.
The cork roofboard acts as a heat soak for the mastic asphalt. Mastic asphalt waterproofing should be laid, where applicable, in accordance with BS 8218: 1998 (Code of practice for mastic asphalt roofing).

Water Vapour Control

Roofs, insulated only with Kingspan Thermaroof® TR31 over joists, and roofs with 121 / 126 mm Kingspan Thermaroof® TR31 over joists and < 60 mm of Kingspan Kooltherm® K7 Pitched Roof Board between joists, do not require a separate vapour control layer.
By combining the water vapour resistance of the foil faced underside of Kingspan Thermaroof® TR31 with the use of a suitable water vapour resistant, non–setting, gun–grade mastic sealant, applied to the upper surface of all supporting timbers, a perfectly adequate vapour control layer can be formed.
A continuous bead of vapour resistant mastic sealant should also be applied between the outside–top corner of all roof perimeter joists and noggins, and adjacent upstands and parapets.
Where 121 / 126 mm Kingspan Thermaroof® TR31 is installed over joists with Kingspan Kooltherm® K7 Pitched Roof ≥ 60 mm thick installed between joists, the application and a separate vapour control layer should be installed under the joists instead.
The separate vapour control layer should consist of either a foil backed vapour check plasterboard or a layer of polythene sheeting installed between the plasterboard and the underside of the joists. The junction between the perimeter of the vapour control layer and adjacent walls should be sealed.
There is a limit to the thickness of Kingspan Kooltherm® K7 Pitched Roof Board that can be installed, for any particular thickness of Kingspan Thermaroof® TR31, in that, in order to avoid a condensation risk, the thermal resistance of the insulation component of Kingspan Thermaroof® TR31 must always be greater than that of the Kingspan Kooltherm® K7 Pitched Roof Board.


Contact Manufacturer

Kingspan Limited

Kingspan Kooltherm Phenolic Foam, Therma PIR, and Styrozone Polystyrene range of rigid insulation boards

Pembridge, Leominster, Herefordshire, HR6 9LA

Kingspan Technical Advisory Service.

Telephone: 01544 388 601 - Fax: 01544 388 888
Email: info@kingspaninsulation.co.uk  / technical@kingspaninsulation.co.uk
Web sites: Kingspan Home Page / Kingspan U-Value Calculator.

Contact us

Insulation Online Limited

27 Massetts Road, Horley, Surrey, Rh4 7DQ, UK

Telephone: 0333 8000 828

Telephone: 01293 781252

Facsimile: 0333 7000 797

Email: enquiries@insulation-online.com