Can I pressure wash my render if I stand well back?

We would not. Thin-coat systems mark easily and older render is often crazed, so water gets behind it. Softwashing achieves a better result without the risk.

What does a hollow sound when tapping mean?

On traditional render it usually means that area has lost its bond to the wall and will eventually come away. It is worth a builder's inspection.

Should I clean render before repainting?

Always. Coating over live algae traps it and it grows back through the paint. Clean, treat, let it dry properly, then coat with a breathable product.

How often does render need cleaning?

Typically every two to four years depending on aspect, shade and how exposed the elevation is.

How to Maintain Render All Year

Render is a sacrificial layer. It is there to take the weather so the wall behind it does not, and like anything sacrificial it needs attention if it is going to last. In a mild, wet, salty climate like this one, render that is looked after can stay sound and presentable for decades, and render that is ignored can look tired within five years and start failing within fifteen. None of the maintenance is difficult. Most of it is looking at the right things at the right time of year and dealing with small problems while they are small.

Know which render you have

Traditional sand and cement is hard, often painted, and prone to crazing and hollow patches as it ages. Modern thin-coat silicone or acrylic systems sit on insulation or board, are coloured throughout and are much thinner than people assume. Monocouche is a single-coat through-coloured render. The maintenance principles are similar but the tolerances are not: thin-coat systems mark far more easily and must never see a pressure lance.

This guide sits under our Wall Cleaning & Softwash work, covering 20-mile radius of Plymouth.

Late winter: look for water paths

The end of a wet winter is when problems are most visible. Walk round after heavy rain and look for dark streaks below gutter joints, splashing where a downpipe discharges, staining under sills without proper drips, and damp patches around vents and pipe penetrations. Every one of these is a water path that will produce algae in spring and a bigger problem in a few years.

Spring: clear and inspect

Gutters cleared, downpipes checked, and a proper look at the render surface itself. Tap suspect areas gently: a hollow sound on traditional render means it has lost its bond and will eventually come away. Look for cracks and note whether they are fine crazing, which is cosmetic, or straight lines around openings, which usually mean movement and want a builder's opinion before anything cosmetic is done.

Late spring to autumn: the cleaning window

Softwash treatments need dry conditions to dwell, so this is when a clean is planned. It is also when a repair or repaint should happen, since render needs to be dry to take a coating. If you are doing both, clean first, allow proper drying time, then coat. Coating over live algae traps it under the paint and it comes back through.

Autumn: cut back and clear again

Once the leaves are down, clear the gutters again if you have trees, trim anything touching the walls, and move stacked material away from the base. Logs, bins and trailers parked against render keep it damp all winter and leave a permanent green patch. Check the ground levels have not crept up over the damp course with mulch or gravel.

Things that quietly ruin render

Pressure washing is the big one, and it is usually a one-off decision with permanent consequences. Others are less obvious: hanging baskets that drip continuously in one spot, a tumble dryer vent discharging onto a wall, a leaking outside tap, an air conditioning condensate pipe, and climbing plants with self-clinging roots that pull the finish off when removed.

Repainting: when and how

Painted render needs recoating periodically, and the right moment is before the existing coating starts failing rather than after. Use a breathable masonry coating: trapping moisture behind an impermeable film is how sound render starts blowing. Clean and treat first, make good any cracks, and pick a settled dry spell. On a coastal elevation expect the seaward face to need doing sooner than the rest.

A simple annual routine

Gutters cleared once a year, a walk round after heavy rain twice a year, vegetation kept off the walls, a softwash clean or light treatment every two to four years depending on aspect, and repainting when the coating tells you it is due. That is the whole programme, and it costs a fraction of patching failed render.

Reader note: Looking after render through a Devon year

Render owner wanting a maintenance routine rather than a one-off clean.

Know which render you have: Traditional sand and cement is hard, often painted, and prone to crazing and hollow patches as it ages. Modern thin-coat silicone or acrylic systems sit on insulation or board, are coloured throughout and are much thinner than people assume. Monocouche is a single-coat through-coloured render. The maintenance principles are similar but the tolerances are not: thin-coat systems mark far more easily and must never see a pressure lance. Late winter: look for water paths: The end of a wet winter is when problems are most visible. Walk round after heavy rain and look for dark streaks below gutter joints, splashing where a downpipe discharges, staining under sills without proper drips, and damp patches around vents and pipe penetrations. Every one of these is a water path that will produce algae in spring and a bigger problem in a few years. Spring: clear and inspect: Gutters cleared, downpipes checked, and a proper look at the render surface itself. Tap suspect areas gently: a hollow sound on traditional render means it has lost its bond and will eventually come away. Look for cracks and note whether they are fine crazing, which is cosmetic, or straight lines around openings, which usually mean movement and want a builder's opinion before anything cosmetic is done. Late spring to autumn: the cleaning window: Softwash treatments need dry conditions to dwell, so this is when a clean is planned. It is also when a repair or repaint should happen, since render needs to be dry to take a coating. If you are doing both, clean first, allow proper drying time, then coat. Coating over live algae traps it under the paint and it comes back through. Autumn: cut back and clear again: Once the leaves are down, clear the gutters again if you have trees, trim anything touching the walls, and move stacked material away from the base. Logs, bins and trailers parked against render keep it damp all winter and leave a permanent green patch. Check the ground levels have not crept up over the damp course with mulch or gravel. Things that quietly ruin render: Pressure washing is the big one, and it is usually a one-off decision with permanent consequences. Others are less obvious: hanging baskets that drip continuously in one spot, a tumble dryer vent discharging onto a wall, a leaking outside tap, an air conditioning condensate pipe, and climbing plants with self-clinging roots that pull the finish off when removed. Repainting: when and how: Painted render needs recoating periodically, and the right moment is before the existing coating starts failing rather than after. Use a breathable masonry coating: trapping moisture behind an impermeable film is how sound render starts blowing. Clean and treat first, make good any cracks, and pick a settled dry spell. On a coastal elevation expect the seaward face to need doing sooner than the rest. A simple annual routine: Gutters cleared once a year, a walk round after heavy rain twice a year, vegetation kept off the walls, a softwash clean or light treatment every two to four years depending on aspect, and repainting when the coating tells you it is due. That is the whole programme, and it costs a fraction of patching failed render.

Questions we get on this

Can I pressure wash my render if I stand well back?: We would not. Thin-coat systems mark easily and older render is often crazed, so water gets behind it. Softwashing achieves a better result without the risk.
What does a hollow sound when tapping mean?: On traditional render it usually means that area has lost its bond to the wall and will eventually come away. It is worth a builder's inspection.
Should I clean render before repainting?: Always. Coating over live algae traps it and it grows back through the paint. Clean, treat, let it dry properly, then coat with a breathable product.
How often does render need cleaning?: Typically every two to four years depending on aspect, shade and how exposed the elevation is.

If this describes your situation

Book the walls and gutters together and we will photograph anything on the render worth watching.

Send photos for a quote Wall Cleaning & Softwash Call 07830 242403

Looking after render through a Devon year