How to Cover Outdoor Furniture Cushions?

The most effective way to cover outdoor furniture cushions is a breathable waterproof cover that fits closely over the cushions while they sit on the furniture, combined with somewhere dry to store them when the weather turns. For longer breaks, remove the cushions entirely and keep them in a ventilated storage box or indoors. Sealed plastic sheeting is the one approach to avoid, because it traps condensation against the foam and causes exactly the mould you were trying to prevent.

Cushions are almost always the first part of a garden set to fail. The frame outlives them by years, so protecting them properly is the single cheapest way to keep outdoor seating usable, and it is the question we are asked most often about garden sets at Furniture in Fashion.

Why Cushions Fail Before Frames Do

Outdoor cushion covers are usually water resistant rather than waterproof. They shed a shower, but sustained rain works through the seams and the zip, and once water reaches the foam it has nowhere to go. Foam holds moisture in its cell structure, and in the mild damp conditions of a British autumn that moisture becomes a mould culture within days.

The visible result is dark spotting on the fabric, a musty smell that survives washing and a cushion that feels heavy and cold. By that stage the foam is the problem, not the cover, and replacing the insert usually costs more than protecting it would have done.

Two other forces do damage. Ultraviolet light fades dyes and weakens fibres, which is why cushions left out all summer look chalky and thin along the top edge. Airborne dirt, pollen and bird droppings then bind into the weave and become far harder to remove once they have been rained into the fabric.

Choose the Right Type of Cover

There are three practical categories, and they solve different problems.

Fitted furniture covers go over the whole piece with the cushions in place. They are the best option for day to day use because you can protect a sofa in thirty seconds when rain arrives. Look for a breathable fabric, elasticated hems, tie down straps and at least one vent panel. Vents matter more than waterproofing: without airflow, warm damp air condenses on the inside of the cover and settles on the cushions.

Cushion storage bags are heavy duty zipped bags sized to hold a set of seat and back cushions. These suit longer periods of bad weather and winter storage, particularly if you have no shed. Keep them raised off the ground rather than sitting directly on paving.

Individual slipcovers are washable fabric covers that go over the cushion itself. They protect against sun fading, dirt and general wear, and they let you change the colour of a set without buying new cushions. They are not a waterproof solution on their own.

Many households end up using two of the three: a fitted cover for the furniture and bags for winter. Whichever route you take, having somewhere secure to put things makes the habit stick, and a bench or box from our garden storage UK sale range does that job neatly.

Getting the Fit Right

An ill fitting cover causes as many problems as no cover. Too tight and it strains the seams, splits at the corners and traps moisture with no room for air to circulate. Too loose and it fills like a sail in the first gust and ends up in a neighbouring garden.

Measure the furniture with the cushions in position, not without them. Take the width at the widest point, the depth front to back and the height from the ground to the top of the back cushion. Then allow around five centimetres of clearance on each dimension. That small gap is what allows air to move.

Check the fastenings. Elasticated hems work well on tables and small chairs. For larger sofas and corner sets, look for adjustable straps with buckles or a drawcord, since elastic alone loses tension over a season or two. Reinforced corners and double stitched seams are worth paying a little more for, because those are the points that fail first.

Making Your Own Slipcovers

If you are comfortable with a sewing machine, replacing tired cushion covers is a straightforward project and considerably cheaper than buying new cushions.

Choose the fabric first, and choose it for the environment rather than the colour. Solution dyed acrylic is the standard for outdoor use because the colour goes through the fibre rather than sitting on the surface, so it resists fading and can be cleaned without stripping the dye. Marine grade polyester and outdoor canvas are also good. Avoid ordinary cotton and indoor upholstery fabric outdoors: both absorb water and fade quickly.

Measure the cushion at its widest and deepest points, then add roughly one and a half centimetres for seam allowance on each edge. For a boxed cushion you need a top panel, a bottom panel and a boxing strip that wraps the sides, with a zip set into the back edge. Use polyester or outdoor rated thread, because cotton thread rots and the seams give way even when the fabric is still sound. A slightly longer stitch length copes better with thick outdoor fabric.

Add drainage. Small eyelets or a few grommets in the base panel let water escape rather than pool inside, which makes a noticeable difference to drying time after heavy rain.

If sewing is not for you, envelope style covers made from two overlapping rectangles need no zip and take very little time. They are less neat but perfectly functional, and they suit the deep cushions used on rattan seating from our modern garden seating sets UK collection.

A Sensible Routine Through the Year

Protection works best as a habit rather than an emergency response.

Through spring and summer, bring cushions inside or into a covered box when you finish using the garden in the evening. It sounds fussy, but overnight dew alone is enough to leave cushions damp by morning. Shake them out weekly and brush off pollen and dust before it binds into the fabric.

In autumn, clean everything before storage. Brush off loose dirt, wash covers according to the label, spot treat marks with a mild soap solution and let everything dry completely. Storing a slightly damp cushion is the fastest route to mould, and completely dry means dry all the way through the foam, which can take a couple of warm days.

Over winter, store cushions in a dry, ventilated space rather than a sealed bag in an unheated shed where condensation forms. Stand them on edge rather than stacking them flat, so air can move between them, and keep them off concrete floors which draw damp upwards. Refresh water repellent sprays on outdoor fabric at the start of each season, once the fabric is clean and dry.

If your set stays out permanently, prioritise the frame material as much as the covers. Aluminium and teak cope with year round exposure far better than steel, which is worth knowing before you invest in cushions for a set that will not last as long. Our modern garden furniture UK sale listings state frame materials clearly for exactly this reason.

Dealing With Mould and Stains

If mould has already appeared, act quickly. Brush off loose spores outdoors, then clean with a mild solution of washing up liquid in warm water and a soft brush. For stubborn spotting on synthetic outdoor fabric, a diluted oxygen based cleaner is safer than chlorine bleach, which can strip colour and weaken fibres.

Rinse thoroughly and dry the cushion in open air, ideally on its side so both faces get airflow. If a musty smell persists after drying, the foam itself is affected and the insert needs replacing. Covers can be saved. Foam usually cannot.

Frequently Asked Questions

Can I leave outdoor cushions outside in the rain?

Occasional light rain is manageable if the cushions dry quickly, but sustained rain reaches the foam through seams and zips. Bring them in or use a breathable cover whenever heavy or prolonged rain is expected.

Are plastic sheets a good way to cover cushions?

No. Plastic sheeting traps condensation underneath, so cushions stay damp even though rain never touched them. Use a breathable waterproof cover with vent panels instead.

What fabric is best for outdoor cushion covers?

Solution dyed acrylic is the most durable because the colour is locked into the fibre and resists fading. Marine grade polyester and outdoor canvas are good alternatives. Avoid cotton and indoor upholstery fabrics.

How do I stop outdoor cushions from blowing away?

Choose cushions with tie fastenings to the frame, or add fabric ties yourself. Fitted furniture covers with straps also hold everything in place, and heavier frames give cushions something stable to sit against in wind.

How often should cushion covers be washed?

Two or three times through the season is enough for most gardens, plus a thorough clean before winter storage. Follow the care label, avoid high heat drying and make sure everything is completely dry before it goes away.