Turf over decking creates a soft, splinter-free surface that is ideal for kids, pets, and bare feet, but boards behave very differently from soil or concrete. This guide walks through artificial grass installation on decking, covering the structural checks, drainage gaps, underlay, and fixings that make the difference between a lasting result and a soggy one.
Is Your Deck a Good Candidate?
Before you buy turf, evaluate the deck itself. A sound, well-drained deck makes an excellent base. A rotting or bouncy one will only pass its problems up into the turf.
- Structure: the deck should be solid, level, and free of rot or soft boards. Replace any suspect timber first.
- Drainage: gaps between boards let rain through, which is exactly what you want. Turf traps water on a sealed surface.
- Height: turf and underlay add thickness, so check door thresholds and step heights.
Step 1: Prepare the Deck Surface
- Clean the boards thoroughly, removing algae, moss, and debris that would hold moisture.
- Secure any loose or lifting boards and drive down protruding screws or nails so nothing telegraphs through the turf.
- Sand off sharp splinters or raised edges along board lines.
- If board gaps are wide or uneven, cover the deck with exterior-grade plywood or a rigid board to create a continuous surface, leaving deliberate drainage gaps or drilling drainage holes through it.
Step 2: Handle Drainage
Drainage is the number one issue on decks. You need water to pass through the turf and off the deck, not pool in the backing.
- Choose a permeable turf with a fully perforated backing.
- Keep the natural gaps between deck boards clear so water drains beneath.
- If you sheet over the deck with plywood, drill regular drainage holes that align with the gaps below.
Safety note: if you are working on a raised deck, keep the perimeter clear, watch your footing near edges, and never lean tools or offcuts against the railing where they can fall.
Step 3: Add an Underlay if You Want Cushion
A permeable foam underlay softens the hard, ridged feel of boards and evens out minor level differences. It is optional but popular for family decks.
- Roll out the underlay and trim it to the deck shape.
- Tape seams so it behaves as a single sheet.
- Make sure the underlay is permeable so it never traps water against the timber.
Step 4: Lay, Fix, and Seam the Turf
Let the turf acclimate in the sun so the backing relaxes, and keep the pile leaning the same direction across every piece.
- Dry-lay the turf, letting it overlap the edges, and cut it roughly to shape.
- Fix the perimeter with galvanized or stainless screws or staples into the joists or a solid board, spacing fixings every few inches around the edge.
- Avoid over-fixing the field. A few well-placed fixings plus perimeter fastening is enough; too many screws create visible dimples.
- Join seams on seam tape with outdoor adhesive, or use fixings hidden in the seam, butting edges with a small gap so no glue reaches the pile.
- Trim the edges cleanly, tucking the turf just under any fascia or trim for a finished look.
Step 5: Brush and Add Light Infill
- Brush the pile upright with a stiff broom.
- Apply a light silica sand infill, typically less than a ground install needs, to ballast the turf and support the blades.
- Brush the infill down evenly.
Because decks vary so much, confirm the right fixings, underlay, and infill against your turf manufacturer's installation spec, which governs the warranty and may specify how the turf should be secured on timber.
Maintaining a Turfed Deck
A deck artificial grass installation is low maintenance, but a little routine care protects the timber underneath and keeps the surface fresh.
- Brush the pile occasionally to keep it upright, especially in walking paths.
- Rinse the turf now and then and let debris fall through so the boards stay clear and dry.
- Once or twice a year, inspect the edges, and lift a corner if practical, to confirm the boards below are sound and draining.
Because a deck can trap moisture in ways an open base does not, this simple checkup is the key to a long-lasting deck artificial grass installation. Keep the drainage path clear and the timber healthy, and a turfed deck stays soft, green, and safe underfoot for many seasons after the artificial grass installation is finished.
Frequently Asked Questions
Will turf make my deck rot?
Not if it can breathe and drain. Use permeable turf, keep board gaps clear, and make sure water passes through rather than sitting against the timber. Trapped moisture is what causes rot, so plan drainage carefully.
Can I lay turf directly on the boards without plywood?
Yes, if the boards are even and the gaps are consistent. If gaps are wide enough to feel through the turf, sheeting over with drilled plywood gives a smoother, more comfortable surface.
What fixings should I use?
Use corrosion-resistant screws or staples, galvanized or stainless, so they do not rust and stain the turf. Fix around the perimeter and only lightly through the field to avoid dimpling.
Upgrade Your Deck to Year-Round Green
A turfed deck is soft underfoot, low maintenance, and always green. If you would like help choosing a permeable turf and the right fixings, see our services or get a free quote. Call 877-692-5349 and we will talk through your deck project at no charge.