Technical Spec
Normal Raised Deck
Important
Gaps between boards
( when laid Side by side )
Gaps between boards
( End to end -Butt joints )
Perimeter Gaps
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Expansion Gaps must be created when installing Deck25 composite decking.
Leave 5 mm gaps between boards when layed side by side.
Leave 5 mm gaps between ends of boards when joining end to end joints ( butt joints )
Leave 8mm - 10mm gaps between deck boards and perimeter material:
Examples:
Create 8mm - 10mm gap between
deck board and brickwork
deck board and stone
deck board and Masonary
deck board and steel
deck board and glass
deck board and fence material
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Deck25 Grooved & Woodgrain
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Important
Joist spacing |
Joists must be spaced no more than 300mm centre to centre
(250mm spacing between joists)
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Deck25 Grooved & Woodgrain |
Important
Airflow
Airflow in
Standard raised Decks
Special Consideration
Sunken, Enclosed, Roof
Terrace and Roof Garden Decks require special consideration
Ensure Adequate Airflow
Elevate Deck Frame above roof surface using Rubber Packers
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All Deck25 Composite, Softwood and Hardwood Decks require good Airflow through the substructure ie: Air must flow freely around The timber components that make up the supporting frame. Good Airflow will protect your deck and maximise it's operational life Standard Raised Deck. Airflow is achieved through the sides of the deck. Should the perimeter be closed in ( fully skirted ) It is important to install 100mm - 150mm air vents on opposite sides of the deck, contained within the skirt. The General rule for a closed in Deck is to install 2no. air vents for every 12m2 of Deck surface area
Sunken and enclosed Decks These are situations where air vents cannot be installed in the sides.
This is achieved by installing air vents in the surface of the perimeter deck boards. Rectangular strip vents or circular air vents of 80mm - 100mm diameter should be installed on opposite sides. The general rule applies: Install 2no. air vents for every 10m2 of deck surface area. Air vents chosen should be made from plastic, Stainless steel or GRP.
please note: Where airflow is further restricted eg High wall around deck or solid panel safety barrier system ( glass, steel or polycarbonate), this will also inhibit airflow. It is good practice to increase gapping between deck boards from 5mm to 7mm to assist evaporation of water from the deck frame cavity. This is particularly important when decking over a flat or near flat roof.
Ensure that the supporting Deck Frame is elevated above the roof membrane using rubber packers, rubber blocks or rubber shoes. Minimum clearance between the bottom of the timber joist (frame) and the roof membrane /surface should be 25mm. The more the better.
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Deck25 Grooved & Woodgrain
Rubber Packers are used for the
following reasons:
Rubber packers will not pierce the roof membrane
Rubber packers distribute weight more evenly across a near flat roof.
Rubber packers cushion impact from Movement on the deck above.
Rubber packers will not rot.
Rubber packers will not conduct water up into the timber framework through capillary action.
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Colours Available
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Deck25 Grooved
Deck25 Woodgrain
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Dark Brown
Medium Brown
Sand
Silver Grey
Designer Black
Atlantic Grey
Redwood
Cedarwood
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Coverage ( laid ) Weight per m2 ( laid )
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Deck25 Grooved
Deck25 Woodgrain
Deck25 Grooved and Woodgrain
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7.1m per m2 laid 7.0m per m2 laid
23kg per m2
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Dimensions of Boards
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Deck25 Grooved
Deck25 Woodgrain
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25mm x 137mm x 4.88m
25mm x 140mm x 4.88m
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Mechanical Property
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Test Method
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Value
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Tensile Strength
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BS2782: Part3, method 320C
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11.3 Mpa
2.1% Elongation
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Flexural Modulus
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ISO 178 Span 150mm
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4181 Mpa
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Flexural Strength
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ISO 178 Span 150mm
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31.5 Mpa
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Impact notched
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BS2782: Part3, method 359
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8.4 KJ/m²
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Impact un-notched
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BS2782: Part3, method 359
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11.1KJ/m²
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Water Absorption
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ASTM D1037
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0.6%
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Coefficient of Expansion
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Across Length
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0.08mm/m/°C
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Screw retention
(composite decking screw)
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Compared to Red Cedar
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76% greater
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Nail retention
(5mm ring shank)
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Compared to Red Cedar
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18% greater
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Specific Gravity
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1.1 +/- 0.05
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Deck25 Grooved slip resistance
HSE guidelines
(4S rubber test)
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Perpendicular to groove (dry)
Perpendicular to groove (wet)
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Extremely low potential for slip (SRV=68)
Low potential for slip
(SRV=40)
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Deck25 Woodgrain
slip resistance
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Perpendicular to board (dry)
Perpendicular to board (wet)
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Extremely low potential for slip Co-efficient 0.88
Extremely low potential for slip Co-efficient 0.96
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