PIR-Plywood Laminate Insulation Board (All Sizes) - 2.4m x 1.2m

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Mannok PlyDeck is a composite insulation board intended for forming warm flat roof decks which will be finished with partially bonded built-up felt waterproofing systems.

Mannok consists of a core of PIR foam auto adhered to two composite aluminium facings. A layer of 6mm WPB plywood is bonded to the insulation to give additional strength and rigidity, and to provide a suitable substrate for partially bonded built-up waterproofing systems.

The low thermal conductivity of the insulation minimises the board thickness, while the composite board offers rapid coverage and straightforward installation. Mannok PlyDeck is suitable for new build and refurbishment projects.

Warm roof construction reduces the risk of condensation within the roof structure and eliminates the need for ventilation beneath the deck: it also protects the structure from extremes of temperature.

Key Properties

Mannok

• does not readily absorb water, making it suitable for use in damp environments;
• is light, robust and easy to handle; it may be worked using a saw or sharp knife;
• is durable and will perform for the service life of the building.

Meeting Regulations

* thickness of PIR board
** 6mm WPB plywood
Results based on roof construction of: 3 layer built-up felt roofing, Mannok PlyDeck board, unvented low emissivity cavity, 12.5mm plasterboard. Calculations performed to EN ISO 6946:1997, taking account of repeating thermal bridges.

Design Notes

• Stagger fixings for adjacent boards to the same joist or noggin.
• Ensure screw heads finish flush with the surface of the plywood.
• Minimise the period between installation of Mannok PlyDeck and of the waterproofing system. In poor weather use polyethylene sheeting as temporary protection of Mannok PlyDeck.

Installation Guidance

Mannok PlyDeck can be installed on 50mm wide joists at 600mm max. centres on roofs intended for occasional maintenance traffic, or 400mm max. centres where more frequent traffic is expected.

Mannok PlyDeck boards must be supported at all edges, including cut edges at penetrations: 50mm x 50mm cross noggins should be fitted between the joists. The boards must bear at least 20mm on all supporting timbers.

Mannok PlyDeck should be fixed with low profile headed screws, long enough to give minimum 35mm embedment into the timbers. Fixings should be at 200mm centres around the board edges (300mm centres on any intermediate timbers) and set at least 10mm from board edges and 50mm from corners.

As 96mm is the maximum board thickness which is practicable to install over joists, U-values of 0.18 W/m2K and lower should be achieved by fitting additional Mannok QR insulation between the joists.

Thermal bridging at roof-wall junctions must be avoided: at eaves and verges the joist space should be packed with insulation; at parapets vertical edge insulation should be applied to the inner face and the wall insulation carried at least 150mm above the surface of the Mannok PlyDeck.

The foil facing on the underside of Mannok PlyDeck has a very high vapour resistance and can be formed into a VCL by sealing the joints between boards, by setting the boards onto a wide (30mm) bead of vapour resistant sealant applied to the upper surface of all the joists and cross noggins.

Installation Sequence

1. Plan the layout of Mannok PlyDeck boards. Cut and fit cross noggins.
2. Apply vapour resistant sealant in a 30mm wide strip to the upper surface of the joists and cross noggins.
3. Lay Mannok PlyDeck boards with long edges following joists and board edges in broken bond.
4. Fix with screws at 200mm centres around board edges: 300mm at any other cross timbers.
5. 5. Lay the waterproofing system.

Product Data

Performance Data

Frequently Asked Questions

What is Mannok Therm Roof / MFR-PLY? Mannok Therm Roof / MFR-PLY is a PIR (polyisocyanurate) foam board insulation with a plywood laminate top and a bonded foil facing on the underside. It is designed for the insulation of floors, walls, and roofs in both new build and refurbishment projects.

What is the thermal conductivity of Mannok Therm Roof / MFR-PLY? Mannok Therm Roof / MFR-PLY has a low thermal conductivity of 0.022W/mK, making it one of the most effective rigid board insulations available.

What is the environmental impact of Mannok PIR Insulation? Mannok PIR Insulation has an ozone depletion potential (ODP) of zero and a Global Warming Potential (GWP) of less than 5. It is certified to ISO 14001 - Environmental Management Systems and has achieved an A+ rating according to the BRE Green Guide.

What types of waterproofing systems are compatible with MFR-PLY? MFR-PLY is designed to be finished with partially bonded built-up felt waterproofing systems, single ply, and hot and cold liquid waterproofings.

What are the benefits of using MFR-PLY in a warm roof construction? Using MFR-PLY in a warm roof construction reduces the risk of condensation within the roof structure and eliminates the need for ventilation beneath the deck. It also minimizes the thickness required to achieve the design U-value due to its low thermal conductivity.

Customer Feedback

The Mannok Therm Roof / MFR-PLY PIR-Plywood Laminate Insulation Board has received positive reviews from customers who have used it for their insulation projects. Many have noted that the product offers excellent thermal performance while requiring minimal thickness to achieve the desired U-value.

Customers appreciate the fact that the MFR-PLY is environmentally friendly, with an ozone depletion potential (ODP) of zero and a global warming potential (GWP) of less than 5. They also value the ISO 14001 certification for Environmental Management Systems, which adds to the product's eco-credentials.

The MFR-PLY's versatility has been praised by many customers, who have used it for insulating floors, walls, and roofs in both new build and refurbishment projects. The composite board offers rapid coverage and straightforward installation, which customers find highly convenient.

Additionally, the compatibility of MFR-PLY with various waterproofing systems, such as partially bonded built-up felt, single ply, and hot and cold liquid waterproofings, has been appreciated by customers. This flexibility allows them to choose the most suitable waterproofing system for their specific project without any hassle.

Overall, customers have found the Mannok Therm Roof / MFR-PLY PIR-Plywood Laminate Insulation Board to be a versatile, easy-to-install, and highly effective insulation product. They would recommend it to others who are looking for a high-quality insulation solution for their projects.

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