woodsmith
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This doesn't look good and I would get someone in to look at the problem asap. Although it is difficult to tell from the photos it looks like the wood is consistently wet throughout the loft, this is a sure sign of condensation forming within the roof space. This is caused by too little ventilation in the loft and too much warm moist air getting into the loft from the house. This problem is made worse when you add insulation if a vapour barrier is not fitted under the insulation.
If you have or know someone who has an electrical multimeter, ( a simple one is cheap to buy) set it on ohms and push the two leads into the timber, if you get a reading then the wood is wet, dry timber will measure infinite resistance and wood in the loft should be dry.
If the wood is completely dry it may mean that the roof just needs a couple of braces around the cracks, if the wood is wet enough to have weakened then you could have a much bigger (expensive) problem to deal with.
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