something very similar happened to me and i thought i'd share. a fire on the neighboring property damaged my unit and the common area fence from the heat. the neighbors insurance company decided they were not negligible and so wont cover my damage.
i have a condo, so normal condo insurance is what i have and that only covers the interior of my condo (and stuff like windows). my HOA insurance, for which i pay as part of my HOA fee, is supposed to cover the outside of my unit and common areas of the complex (i.e, everything not covered by my insurance). however, it turns out there is a small clause in the HOA agreement stating that if their insurance amount is not enough to pay all damages the owner is liable for the difference. and since their deductible is $5k and the damage was only $3k, they decided not to file. so the HOA people say i'm stuck with all of it. o joy.
personally i don't think it's legal for the HOA to claim this. since they did not even file a claim with their insurance company they cannot say their insurance coverage amount was "not enough" - it was not any at all! i am going to the HOA meeting wednesday to try and argue for them to pay for everything out of pocket, which is what anyone has to do if it doesn't meet their insurance deductible.
i'd appreciate if anyone has any advice or resources or anything. thanks!
-jb
Sounds like your HOA needs to re-evaluate their coverage. Sounds like you guys are stuck with a $5k deductible like it or not.