Proper preparation and installation are crucial for achieving a durable, aesthetically pleasing, and long-lasting decking project. Below is a detailed guide to installing Suelo WPC decking.
Before You Start
Acclimatization: Allow the decking boards to acclimatize for 3 days, raised 100 mm off the ground while ensuring they are flat and dry.
Stable Conditions: Installation should occur on a stable, flat surface to prevent deformation of the decking.
Preparing the Area
Substrate Requirements:
Install on a solid surface, such as concrete. Grass, uneven paving slabs, or sand will cause movement and damage the decking.
A drainage channel in the foundation is recommended to ensure free water flow every 600–800 mm.
Joists/Keels:
Composite keels should not be directly fixed to foundations.
Keel/joist centres should be spaced no more than 300 mm apart. For diagonal board installation or elevated decking, reduce spacing to 250 mm.
Double joists are recommended under butt joints for proper support.
Ventilation and Elevation:
Ensure proper ventilation. The decking should not be enclosed on all four sides. Leave 70 mm clearance beneath the deck to allow airflow and prevent moisture buildup.
Deck boards must be raised 50 mm off the ground, while composite keels require a minimum elevation of 25 mm.
Consultation:
Installation Steps
Drainage Slope:
Spacing and Fixing:
Maintain a 6 mm gap between deck boards to allow for expansion.
Use electrophoretic-coated Grab Deck Clips and stainless-steel screws. Install at 300 mm centres, requiring at least 12 clips per 3.6 m board.
For the first and last boards, use stainless steel Starter Clips at the same spacing.
Butt Joints:
Place double keels under butt joints, securing each side with Grab Deck Clips. Leave an 8 mm gap between boards for expansion and drainage.
When boards meet walls or fixed objects, leave a 10 mm gap.
Support:
Deck boards must be supported along their entire length. Do not allow overhangs exceeding 10 mm.
Composite keels must be supported at maximum 400 mm centres for regular installation, or 250 mm centres for Suelo decks.
Pedestals:
Use pedestals for additional support:
Every 400 mm along 61 mm x 41 mm composite keels (10 pedestals per 3.6 m board).
Every 450 mm for 60 mm x 40 mm treated timber joists (8 pedestals per 3.6 m board).
Pedestals should adjust from 35 mm to 60 mm to ensure proper leveling.
Rails and Posts:
Keel End Joints:
Additional Tips
Non-Structural Keels: Composite keels are non-structural and should only be installed on solid surfaces.
Seasonal Movement: Plan for material expansion and contraction by maintaining proper gaps.
Surface Drainage: Ensure a drainage slope to avoid water pooling and maintain durability.
Following these guidelines will ensure a smooth, professional installation of your Suelo WPC decking, offering long-lasting beauty and performance.
