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


Est Delivery between and .

These products are sold in pack quantities only. Price listed is per pack. Please see pack quantities below.

Thickness Sheets Per Pack Coverage Per Pack
56mm 20 57.6m2
76mm 18 51.84m2
96mm 14 40.32m2
116mm 11 31.68m2
136mm 10 28.8m2


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


  • 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

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


Length 2400mm
Width 1200mm
Thermal Conductivity 0.022 W/mK
Weight 10kg
Brand Mannok
Material Type Polyiso

Est Delivery between and .

Delivery will always take place on a weekday (Mon - Fri).
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