I have a roof built relatively recently over a concrete slab. It's a reinforced concrete frame and this is how things are normally done. The roof done with pine wood and then has it has concrete tiles over it. One problem...wood-boring insects have attacked it, especially on the north and north-east side (much less sun on that side.)
After reading I seem to have some options: 1. Aluminum Phosphide. Even though I can't cover it, I can put a lot of it and hope for the best, at least it costs next to nothing. Problem is that it reacts with copper and can damage a lot of stuff there.
So, what should I do : ) ? Drilling every few inches is a no-no since it weakens it and I have tried to insert fungicide with a syringe on the exit holes. Do think this tar thingy lets enough fungicide down if I keep spraying?
Also, I am working to lower humidity.