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Old 2014-01-23, 12:02 PM
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gerapau gerapau is offline
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Yes, mostly 2x4s with metal plates where they join. Yes, they are designed to take these stresses. Not a good idea to spray foam where you are mentioning. Besides, the top chord would still be on the outside of the insulation and could still cause the same noise.

We have an open area on our main floor where the roof trusses span about 35-40 feet without any walls under them. When we first moved in we mentioned this noise to the builder and were reassured that it is very normal. It was explained to us that the larger the span that the truss covers the more the stresses build up and the louder it can get. Ours can be very loud when they "crack". But after 3 years we are used to it.
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