Why is my conservatory roof so noisy in the rain?

1Why thin sheets drum

A raindrop is a small impact. On a heavy tiled roof, the covering absorbs it. A polycarbonate sheet is only a few millimetres thick and clamped between rigid bars, so each impact sets the panel humming, and the empty room below acts like a speaker box.

Hard, cold sheets ring more than warm ones. Multiwall polycarbonate is a little quieter than a single skin because of the air in its channels, but the effect is modest. Glass is dense but thin, and the sound is sharper than a dull drumming, especially under hail.

The noise is also tied to the roof's shape. A shallow pitch makes drops land square on the surface and bounce, while a bigger, flatter area gives more surface to vibrate. Wind-driven rain adds a rattle at loose bars and caps, which is a fault worth fixing in its own right.

Hail is the worst case. It strikes harder and in bursts, so even a well-fixed roof sounds like a drum kit for a few minutes. If a gale-driven shower is loud but a calm one is not, loose fixings are often part of the cause.

2Small fixes that help a little

Start by listening for anything loose. A cap that has lifted, a bar that has lost a screw or a sheet that is no longer held firmly by its seal will buzz or tick in the wind and rain. Tightening or replacing those parts removes the rattle, though not the drumming.

Some people add a layer of insulating material inside the roof, or fit blinds designed to deaden sound. Thick lined blinds take the edge off the noise without silencing it, and they reduce glare in summer too.

It is worth being straight about the limit. A lightweight roof with a lightweight lining stays a lightweight roof. If the noise is the main complaint, patching the sheets seldom satisfies, because the thing creating the sound is the sheet. If you can also hear dripping, treat that as a separate fault and have the joints looked at before spending on sound.

Foam strips under the bars and fresh gaskets can stop a bar from chattering against a sheet. That costs little and is worth doing while someone is up there checking the seals.

3Gutters and downpipes add their own noise

Some of what you hear is not the roof at all. A narrow plastic gutter fixed directly to the frame carries sound into it, and rushing water in a short downpipe by the door can be as loud as the roof itself.

Fitting rubber-isolated brackets, lining the gutter or widening the downpipe can soften those noises. A gutter that is blocked, overflowing and splashing on the cill makes a different sound again, a steady splatter beside the window.

It is common to blame the roof for noise that the gutters are doing. Our page on conservatory gutter replacement and leaks covers what to check, and it is worth ruling these out before replacing the roof for sound alone.

Check the point where the downpipe meets the drain too. If it runs freely into a gully, the sound is quiet, but a splash on bare paving carries across the garden and into the room.

A downpipe fixed tightly with a rubber-lined clip is quieter than one rattling in a loose bracket.

4How a solid roof changes the sound

A solid roof is built from several layers, usually a tiled or slated covering, battens, insulation, a vapour control layer and plasterboard. The covering is heavy, the insulation soaks up vibration, and the ceiling stops the sound reaching the room. Rain becomes a faint murmur, closer to how it sounds in the rest of the house.

Not every solid roof is equal. A lightweight panel roof, with thin skins around a foam core, quietens a room less than a traditional rafter build-up with insulation between the timbers. Ask exactly how the roof is made up, and what the ceiling is.

A solid roof also needs a building control application and a check that the frame can take the extra weight. The warmth that comes with it is covered in winter comfort in a conservatory.

Ceilings matter more than people expect. Plasterboard with a skim finish blocks more of the sound than a thin lining board, and insulation packed fully between the rafters leaves fewer hollow spaces for sound to bounce about in.

5Weighing noise against light

The trade-off is daylight. A solid roof is quiet because it is opaque, so the room is dimmer unless the design includes roof windows or a glazed panel. A panel of glass in a solid roof brings back some of the rain sound, but only above that panel.

If you want both, a solid roof with a generous roof window or two is the usual compromise. We cover this in will a solid roof make my conservatory dark.

The survey is where we hear your actual complaint. We note whether the noise is drumming, rattling or rushing, which wall takes the most rain, and how you use the room. The written quote follows, and the conservatory roof replacement page sets out the options.

Some people accept a little rain noise and enjoy it. If you do, a glazed section in a solid roof lets you keep some sound as well as light.