New workshop tin roof query

[Jonathan]

Hi all.
I've been scratching my head on this one and thought I would run it past you guy to see what you think.

Long story short, I'm building a terrace (55m2) and a off grid workshop (150m2) with galvanised tin roof covering. The reason for using tin is there is no thermal mass.....I'm up in the Bush in Andalucia Spain and summer temperatures get up to 45° in the shade.
We have lived for 10 years with a terrace roof similar to the attached design, BUT it has no wool or T&G boarding. In the summer it's noisy! and hot!
Part of our house has a roof as per the design attached, but instead of wool it has 50mm polystyrene, it's noisy.

The roof noises are from a combination of things, rain drumming (in winter) and thermal creep on the polystyrene (if a cloud comes over the contraction is noisy).
My theory is the wool insulation under compression will stop the drumming and help with the solar creep noise, also help insulate the workshop roof and stop the tin reaching due point.
Traditional here a workshop roof is 10+ meters high so the heat only gets to ground level in late afternoon, my workshop roof will be approximately 3meters.....

I believe this design is simular to how it would be done in Australia.
Looking for criticism so I don't make too many mistakes.

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[MJ80]

Have you looked into the sandwich trapezoid roof panels. I'm looking at them covering over an old silage bay to make it into a garage. We get pretty hot in the summer and very cold in the winter here in Germany so I need to try and stop condensation. They might help

 

[Jonathan]

Have you looked into the sandwich trapezoid roof panels. I'm looking at them covering over an old silage bay to make it into a garage. We get pretty hot in the summer and very cold in the winter here in Germany so I need to try and stop condensation. They might help

Hi MJ80 and thanks for replying.
Yes I've looked at sandwich panel and was hoping it would be suitable......I need to match it to galvanised corrugated tin and no one in Spain makes it. I can get it from Australia or New Zealand.....also I have also been told that the sandwich panel has very little sound insulation, so unfortunately it's not suitable for my situation.

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[MJ80]

There are companies that do the spray foam onto the back of roofing panels, have you seen it over there?

 

[9fingers]

I agree the metal sandwich stuff is noisy. We had a building put up at work about 15 years ago and even then it would have had to meet reasonable thermal insulation but it certainly had minimal insulation effect on sound. Even a modest rain shower meant you had to speak louder to be heard.

If using corrugated sheets I'd assume with the intense sun load, there would be movement of fixings to consider which could be noisy too. Woollen insulation should not contribute any noise though.
Be careful about compressing insulation as it will become less effective. Insulation primarily relies on pockets of trapped air and compressing it removes/reduces the pockets.

Bob