How to Build a Cedar Plank Privacy Screen

A cedar plank privacy screen can turn an exposed patio, balcony, pool area or side garden into a more comfortable outdoor room. Western red cedar is popular because it is lightweight, easy to cut and naturally resistant to decay, while its warm colour suits modern, coastal and traditional Australian homes.

The project is within reach of a confident DIYer, but a durable result depends on careful planning. Screen height, post strength, airflow, drainage, fixing choice and local council rules all matter. With accurate setting out and weather-resistant materials, a cedar privacy wall can provide many years of practical screening and visual appeal.

Plan the screen around its location

Start by deciding what the screen must block. A narrow vertical screen may be enough to hide a neighbour’s window, while a wider panel could shield a dining area from a street, driveway or nearby second-storey view. Draw the proposed length and height on paper, then mark the line with string or spray chalk outdoors.

Pay attention to the sun and prevailing wind. A solid wall can make a small courtyard feel dark and can catch strong gusts, especially in exposed coastal suburbs. Leave a modest gap between boards, or use a slatted design, to let air and filtered light through. Around Brisbane and other humid areas, ventilation also helps timber dry after rain.

Check the boundary before digging or fixing anything. A screen placed on your land may still be subject to local planning controls, particularly if it is close to a boundary, pool or footpath. Rules differ between councils in Sydney, Melbourne, Perth and regional areas, so check your council website before buying materials. A simple sketch and a visit to the local planning counter can prevent an expensive alteration later.

Use this planning stage to browse practical garden project ideas and compare the screen with existing paving, planting and outdoor furniture. The best design usually looks like part of the garden rather than an added fence panel.

Choose suitable cedar and structural materials

Western red cedar is commonly sold in Australia through timber yards, specialist suppliers and some large hardware stores. It may cost more than treated pine, but it is lighter, easier to handle and naturally attractive. Select straight boards with consistent thickness, limited loose knots and no deep splits. For an outdoor screen, decking, cladding or clear-grade boards are generally more suitable than thin indoor lining boards.

Cedar should usually be fixed to a strong frame rather than used as the only structural element. Galvanised steel or treated pine posts can support the screen, although hardwood posts may suit a higher-end finish. In coastal areas, stainless steel screws are a worthwhile upgrade because salt air quickly exposes weak or rust-prone fasteners.

For a freestanding screen, use posts that are strong enough for the span and expected wind load. Many small screens work well with posts around 90 millimetres square, but the correct size depends on height, width, soil and local conditions. A screen over roughly 1.8 metres high or one installed in a windy location may need deeper footings, closer posts or professional structural advice.

Allow for post concrete, gravel or drainage material, exterior screws, a top and bottom rail, spacers, a spirit level, drill, saw, shovel and string line. A post-hole digger can save considerable time in soft ground, while a rotary hammer may be needed if the screen is being attached to an existing concrete slab.

Set out posts and prepare stable footings

Measure the full screen line and divide it into manageable bays. Cedar planks commonly span between horizontal rails, so keeping post centres consistent makes the finished work look orderly. Leave enough room at corners and ends for screws without placing fasteners too close to the edge of a board.

Before digging, contact the relevant utility locating service and inspect the area for irrigation pipes, electrical conduits and drainage. This is especially important in established gardens where previous owners may have installed underground lighting or automatic watering. Mark the post positions with stakes and run a taut string between them to maintain a straight line.

Dig each footing below the unstable topsoil and into firm ground. The exact depth varies with the screen height and soil type, but deeper footings are needed for tall panels and exposed sites. In sandy coastal soil, wide or reinforced footings may be necessary; in reactive clay, movement can affect alignment. A local builder or engineer can advise where the screen is large, close to a retaining wall or exposed to severe winds.

Place a small amount of drainage gravel at the base of each hole if appropriate, then set the posts carefully. Check the face, spacing and plumb of every post before adding concrete. Brace them temporarily with scrap timber and recheck the line while the concrete is still workable. Allow the footing to cure according to the product instructions before loading the frame.

Build a frame that protects the timber

Attach horizontal rails between the posts, usually near the top, middle and bottom of the screen. Two rails may be enough for a low, open slatted panel, but a taller solid arrangement benefits from a third rail to reduce board movement. Keep the lower rail above splashback from paving and soil so the cedar is not continually wet.

Use a level to keep each rail horizontal and maintain a consistent face across the frame. If the screen follows a slope, decide whether the top edge will step between posts or run parallel with the ground. A stepped design often gives cleaner gaps at the base, while a sloping top can look more streamlined beside a ramp or angled garden bed.

Create a small separation between cedar and concrete, masonry or damp ground. Cedar lasts longer when air can circulate around it. Avoid burying cedar boards or allowing mulch to touch the timber. A gravel strip, paved edge or narrow planting border can reduce splash and make future maintenance easier.

Where boards meet the frame, drill pilot holes to minimise splitting. Stainless steel or hot-dip galvanised screws are preferable to ordinary bright steel screws, which can stain cedar and corrode outdoors. Choose screw lengths that pass securely through the board and into the rail without protruding at the back.

Install cedar planks with consistent gaps

Let the cedar acclimatise under cover before installation. Keep the boards flat, dry and raised off the ground, with air able to circulate around the stack. Timber can expand and contract as Australian humidity changes, so installing boards immediately after delivery may lead to uneven gaps or cupping.

Begin at one end and use a spacer block between each plank. A gap of around 10 to 20 millimetres is common for a privacy screen, although the right measurement depends on the board width, viewing angle and amount of ventilation required. Smaller gaps provide greater privacy, while wider gaps create a lighter decorative partition.

Fix each plank with two screws at every rail, keeping the screws aligned for a neat appearance. Do not overtighten, as this can crush the cedar and encourage surface splitting. Check several boards with a level as you work, because a small error at the first few planks can become obvious across the entire screen.

Vertical boards give a taller, more formal appearance and can make a narrow garden feel elongated. Horizontal boards suit contemporary courtyards and can visually widen a compact space, but they need careful support to prevent sagging. For a more detailed feature, alternate board depth, add a framed opening or combine solid planks with a narrow trellis section for climbing plants.

Finish the screen for Australian weather

Cedar can be left to weather naturally to a soft silver-grey, which many homeowners prefer for coastal and native-style gardens. The change is caused by ultraviolet light and surface weathering; it does not necessarily mean the timber is failing. However, the colour may develop unevenly where parts of the screen remain shaded by plants or a roof.

To retain the original honey or reddish tone, apply an exterior penetrating oil with UV protection. Test the product on an offcut first because cedar absorbs finishes differently depending on its grade and surface preparation. Recoat according to the manufacturer’s instructions, paying particular attention to exposed end grain and the top edges of boards.

Avoid film-forming products that trap moisture or peel badly unless they are specifically designed for cedar cladding. Clean the timber gently with a soft brush and mild detergent before recoating. Pressure washing can damage the soft grain and leave a rough, fuzzy surface.

Inspect the screen at least twice a year. Look for loose screws, cracked boards, movement at the post bases, soil piled against the cedar and signs of insect activity. Termites are a real consideration in many Australian regions, particularly where timber is close to garden beds or damp ground. Keeping the base visible and dry makes inspection easier, while prompt repairs prevent minor defects becoming structural problems.

Add planting, lighting and privacy details

A cedar screen works well as a background for layered planting. In a sunny Melbourne or Adelaide garden, use drought-tolerant grasses, westringia or compact shrubs near the base while leaving enough clearance for airflow. In a shaded Sydney courtyard, ferns and shade-tolerant foliage can soften the timber without placing constant moisture against it.

Climbers can provide extra screening, but select them carefully. Vigorous vines may add weight, trap water and make maintenance difficult. Use a separate trellis fixed slightly in front of the cedar rather than attaching heavy stems directly to the boards. This protects the timber and allows the plant to be pruned or removed without damaging the screen.

Low-voltage outdoor lighting can highlight the cedar grain after dark, but keep cables and transformers rated for exterior use. Concealed uplights behind planting create a gentle effect, while small shielded fixtures along the posts improve safety around steps and paths. Electrical work connected to mains power must be completed by a licensed electrician in Australia.

Around pools, make sure the screen does not compromise required fencing, gate or climbable-zone regulations. A decorative privacy panel may need to be designed as part of the compliant pool barrier, not simply placed beside it. Also consider access for cleaning, painting and furniture movement before closing off a narrow side passage.

A carefully built cedar screen can provide privacy without making the garden feel enclosed. Confirm the rules, choose sound timber, set deep and well-aligned posts, and give the boards room to breathe. Gather the materials, mark out the first post and turn the unused edge of your outdoor area into a durable, welcoming retreat.