An outdoor sofa stands on the terrace in summer, often unprotected in autumn rain and winter. The question is not whether it gets wet, but how quickly it dries and whether cushions and covers are damaged. Those choosing an outdoor sofa need to know which materials tolerate moisture, how cushion cores react, and when a cover is useful. This guide explains what matters for cover fabrics, upholstery, and care.
Which cover fabrics are suitable for outdoors
Outdoor covers are usually made of solution-dyed polyacrylic or coated polyester. Polyacrylic is solution-dyed, meaning the color is in the yarn and hardly fades. The material dries quickly because it absorbs little water. Polyester with PVC or polyurethane coating is denser but feels less textile. Both variants withstand UV radiation without fading after one season. Cotton or linen are unsuitable for outdoor furniture because they retain moisture and develop mildew stains.
High-quality outdoor fabrics have a water column of 300 to 500 millimeters. This is enough for rain to bead off, but air to circulate. A completely waterproof cover would trap condensation and moisten the cushion from the inside. The grammage is usually between 280 and 400 grams per square meter. Lighter fabrics wear out faster, heavier ones dry slower.
How cushion cores react to moisture
The core of an outdoor cushion consists of open-cell foam or polyester fibers. Open-cell foam allows water to pass through and drain downwards. It dries in two to four hours if air can circulate from all sides. Closed-cell foams, common in indoor furniture, soak up water and take days to dry. Polyester fibers absorb little water but lose their shape faster than foam.
Some manufacturers use quick-drying foams with drainage channels. These cores have grooves or holes through which water drains. They weigh less and dry in one to two hours. The disadvantage is a slightly firmer seating feel. For regions with frequent precipitation, this design is the better choice.
What happens in the rain and when it becomes critical
A short shower doesn't bother an outdoor sofa. The cover repels water, the cushion absorbs little water, and after two hours of sun, the surface is dry. It becomes critical with multi-day rain without a drying phase. Then moisture can accumulate in the cushion, especially if the sofa is on a closed surface. Water that cannot drain leads to mildew stains and odor.
Nights with dew are also problematic. Moisture settles on the cover and slowly soaks in. Over weeks, this adds up, even if it's dry during the day. A sofa should therefore stand on a surface with a gap to the ground so that air circulates from below. Aluminum or stainless steel feet at least eight centimeters high are standard.
When a cover is useful
A protective cover keeps rain out but also traps air. If you cover the sofa while it is still damp, you risk mold. The cover should only be placed on dry furniture and have ventilation slits on the sides. For winter, a cover is useful because it protects against snow and frost. In summer, it is usually sufficient to leave the sofa freestanding.
Some manufacturers recommend bringing cushions indoors during prolonged rain. This is practical if the cushions are removable and storage space is available. Permanently upholstered sofas remain outdoors. Here, it helps to slightly tilt the seat so that water drains off. A board or wedge under one side is sufficient.
Guidelines for drying times and material thicknesses
| Material | Drying time after rain | Recommended cushion thickness |
|---|---|---|
| Open-cell foam | 2 to 4 hours | 8 to 12 cm |
| Quick-drying foam | 1 to 2 hours | 6 to 10 cm |
| Polyester fiber | 3 to 5 hours | 10 to 15 cm |
| Polyacrylic cover (300 g/m²) | 30 to 60 minutes | , |
Care and cleaning after rainy periods
After a prolonged rainy period, covers should be brushed to remove pollen and dirt. A soft brush and clear water are usually sufficient. Stains can be treated with mild soapy water. High-pressure cleaners are unsuitable because they damage the impregnation. Once a year, re-impregnation with an outdoor spray can be useful if the water-repellent effect diminishes.
Cushions should be placed on their side after heavy rain so that water drains from the cores. If possible, place them in the sun or a airy place for one to two days. If a cushion smells musty, a mixture of water and vinegar in a ten-to-one ratio helps. Spray the solution, wipe it off after ten minutes, and dry the cushion.
What to look for when buying
A good outdoor sofa has removable covers with zippers. This allows cushions to be dried separately and covers to be washed. Seams should be double-stitched and sewn with UV-resistant thread. Aluminum or stainless steel frames do not rust; wood requires regular maintenance. Feet with floor protectors prevent scratches on patio tiles but should be high enough for water to drain.
- Choose a cover made of solution-dyed polyacrylic with a grammage of at least 300 g/m²
- Prefer a cushion core made of open-cell foam or quick-drying foam
- Look for removable covers and double-stitched seams
- Check for feet at least eight centimeters high for air circulation
- Use a protective cover only for winter or prolonged absence
You can find suitable pieces under Outdoor Sofas and Outdoor Accessories. Information on how the pieces are constructed, available dimensions, and delivery times can be found on Eichholtz Outdoor.
Frequently Asked Questions
Can an outdoor sofa stay outdoors all year round?
Yes, if the cover and upholstery are designed for outdoor use. In winter, a breathable protective cover is recommended to keep out snow and frost. Cushions should be dry before being covered. In regions with severe frost, aluminum or stainless steel frames may be more suitable than wood.
How often do outdoor covers need to be washed?
Once or twice per season is sufficient with normal use. Stains should be treated immediately before they dry. Most covers can be machine washed at 30 degrees without fabric softener. Both the cover and cushion must be completely dry before reattaching.
What to do if the cushion smells after rain?
Place the cushion on its side and let it dry in an airy place. Spray a solution of ten parts water and one part vinegar, let it sit for ten minutes, and wipe it off. Then dry completely. For persistent odors, place the cushion in the sun for several days.
Are outdoor cushions as comfortable as indoor furniture?
High-quality outdoor cushions come close to the comfort of indoor furniture. Quick-drying foams are slightly firmer but offer good seating comfort. Polyester fibers are softer but give way faster. The cushion thickness should be at least eight centimeters to prevent the seating feel from being too hard.