Question answered
Are roof windows noisy in the rain?
The short answer
Roof windows can be noisier in the rain than wall windows, because the glass lies almost flat and nothing sits between it and the weather. A shower makes a soft patter, while heavy rain or hail on a standard pane can drum. The difference between a quiet room and a loud one comes mainly from the glazing specification, the insulation around the frame and how the roof is built behind it.
A roof window sits in the thinnest part of a room's enclosure, so rain is heard more than it is through a wall. How much more depends on the glazing, the roof behind it and the weather.
Why rain sounds louder on a sloping pane
Rain hitting a wall window glances off a vertical surface. On a roof window the drops land on a sloping sheet of glass that faces straight up into the weather, so more of the energy goes into the pane and into the room beneath. The glass behaves a little like a drum skin, and the frame carries some of that vibration into the surrounding structure.
The room itself matters as well. A loft bedroom with a plasterboard ceiling hung close under the rafters has little between you and the covering. A loft converted with a thick insulated lining hears the same rainfall far less. So two identical windows in two different houses can sound quite different, and neither is faulty.
Short, light showers are rarely a problem. The complaint usually comes from a long spell of heavy rain, or from hail, when the impact is sharp and repeated.
How the glazing changes what you hear
The pane is the biggest single factor. A single sheet of toughened glass rings more than a thicker, laminated one, because the plastic interlayer in laminated glass damps the vibration. A double or triple sealed unit lowers the noise again, and a thicker outer pane lowers it further. Window makers publish glazing options for their roof windows, and some of those are sold specifically as quieter choices for bedrooms and nurseries.
Ask for the glazing specification in writing before you order, and ask what the outer pane is made of. Do not assume that a window described only as double glazed will be the quietest on offer.
Changing the glazing later is sometimes possible with the frame left in place, but it is a much simpler decision at the ordering stage. If a room will be used for sleeping, spend your thought on this choice first.
What the roof around the window adds or removes
Noise also travels through the frame, so the way a window is fitted matters. A well-packed frame, with insulation fitted tightly between the frame and the rafters and the underlay lapped correctly, carries less vibration into the room and keeps the lining quiet. Gaps, loose packing or an ill-fitting flashing kit can rattle in a gale and be mistaken for rain noise.
The flashing is the metal or preformed apron that seals the window into the roof covering. If it is poorly dressed or loose in its fixings, wind-blown rain makes it tick and tap. On a coastal roof, where sea gales push rain hard across the slope, that is worth checking.
The covering around the window plays its part too. Heavy natural slate and clay tiles muffle sound better than a lightweight metal sheet. A flat or low-pitched roof beside the window is more resonant than a steep tiled slope.
Hail, gales and what coastal roofs add
On the Sussex coast the sound is often wind first and rain second. A gale off the Channel sends rain across the slope in bursts, and a window set on an exposed pitch picks up each gust. That is a property of the site, and no pane will remove it, though a better specification will soften it.
Hail is the loudest case. It is brief, and a decent laminated unit takes the edge off it. Be wary of any suggestion that a particular window is silent in a storm. A roof window is a hole in the covering with glass in it, and in bad weather you will always hear something, even if only a muffled hush.
If you already have a window that seems louder than it should be, check the lining and the flashing before blaming the glass. A loose element is a repair, not a design flaw, and it is usually easy to cure from the outside.
What to ask before you choose a window
Start with the room. A bedroom or a child's room deserves the quieter glazing option, while a landing or a bathroom may not. Then ask your fitter four things: what the outer pane is made of, whether a laminated or acoustic option is offered, how the frame will be insulated into the rafters, and how the flashing will be fitted to your type of covering.
Add the rest of the project to the conversation. Our page on whether a roof window or a dormer suits a loft conversion explains the trade-off between the two, and the questions about roof window security overlap with the glazing choice, since laminated glass is harder to break.
We look at the roof around the opening at survey, take photographs of the existing covering, and then give a written quote. The wider range of work is described on the skylights and roof windows page.
Roof window noise: two more questions
Will a roof window in a bedroom keep me awake in a storm?
It can, if the room has a standard single-layer outer pane and thin lining. A quieter glazing option, good packing round the frame and a well-fixed flashing all help. Sleep is the reason to pick the specification before the window is ordered, not after.
Is a drumming roof window a sign that something is wrong?
Not by itself, since glass facing the sky will always carry some sound. A tapping, ticking or rattling noise in wind is different. That points to a loose flashing, a gap round the frame or a shifting covering, and it is worth having looked at.
Tell us about your roof
Describe what is happening and we will call you back to arrange a visit.
- Photographs of what we find
- A written quote with one total price
- Or call 01903 299063
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