Noisy clicky corrugated metal roof- please help!

[jakeR]

Hello,

I have been doing a refurbishment of a 1980s timber framed house and have replaced two roofs with black 13/3 corrugated steel. I'm very pleased with how it went and how it looks, however... it is noisy! I was warned that it would be louder in the rain but it is not that significant and I quite like that sound. It is, however noisy when the sun hits it and there are pops and clicks all over the roof, I think caused by thermal expansion. I would expect this to happen a bit but it really is very noticeable and when there is intermittent sunshine it happens a lot. One of the roofs is a (celotex) warm roof and so the noise of this travels inside quite effectively. I'm supposed to be cladding some of the walls in the same corrugated steel but am loathed to do this until I've figured out how to mitigate this. A bit of googling suggested that it may be do with the fixings being overtighted but I just had a roofer look at it and he thought they looked fine. Anyone had any experience of this or have any suggestions about how I might be able to fix it? Painting it all white would help I guess but I really don't want to be doing that!

 

For context the layup of the warm roof is:

Corrugated steel fixed with 65mm BAZ screw from Cladco

45x70mm timber batten

breather membrane

45x70mm timber counter batten

200mm PIR insulation

Alutrix 600 vapour barrier

18mm Plywood

original 38 x 100mm timber trusses

 

The cold roof is the same but minus the PIR vapour barrier and plywood deck.

 

Any help would be very much appreciated. Thank you.

 

 

 

 

 

 

 

 

Edited 3 hours ago by jakeR

[Spinny]

Maybe you can try to identify exactly where the noise is coming from, does it eminate from the fixing points, or the overlaps, or movement against the battens etc ? Not sure how you do that, but maybe you could rig up a test piece at ground level replicating the roof structure, then apply heat ? Maybe you could photograph/measure the sheets/fixings etc  when cold and hot in different places ?

 

I can only say plumbing felt helps a lot with noise from copper plumbing/heating pipes expanding and contracting as they get hot and cold. They eliminate the friction between the pipes and the joists they pass through. So if you could identify the exact source, you might be able to insert some felt or other material which allows movement without noise

[Tom]

Stick a load of PV panels on it? 

[Bramco]

We don't get clicks but we do get bangs as the metalwork heats up. But they aren't often and aren't that loud, more a boom than a bang. So it does't really worry us.

 

The bangs and your case clicks can't surely be from expansion across the corrugations, so must be from expansion along the sheets. Our roof is screwed onto horizontal battens. So maybe there's play in the battens which takes up enough expansion to only occasionally have to jump and cause the bangs.

Part of our build also has the walls clad in crinkly tin. Again the sheets are mounted vertically across horizontal battens.

 

It would be a shame to have to demount what's already installed but the idea from @Spinny might be worth trying. If you do, do a test, then to really check things out, you'd have to do it with a sheet the same length as your roof and with a similar build up of at least the external part of the roof, otherwise you wouldn't be sure.

 

Another thing to check might be the screws and washers - we used EJOT low profile screws. See the attachments.

 

Hope you get things worked out.

 

JT3_FR2_4_9_timber range.pdf JT3-FR3 range.pdf

Edited 1 hour ago by Bramco

[Mr Punter]

If you have a 50mm layer of rockwool compressed under the sheets it helps a lot, but you would need to take the sheets off and refit.