I’m buying a home in southeast Alaska that is developing some mold issues; and I’m looking for suggestions from you fine folks on how to take care of the problem. I’ve read many of the previous posts on the subject but did not run across circumstances quite the same as I have; so here goes. The home is new(er); being built by the current owner/builder over the last 2 years. The mold is growing on the underside of the roof sheathing and has been spreading over the last 8 months; which is when we first started looking at the house. Photos are shown in following posts. The house has a metal roof with 5/8” CDX roof sheathing. There is no ridge vent. There are dual 12"x12" vents on 2 of the 3 gable ends and eave venting (1-1/2” – 2” dia holes) in every other truss space (24” oc). The builder did not put in a vent on the 3rd gable fearing leakage because of the exposure to driving wind and rain. A schematic of the house is included below. There is no leakage in the roof and the dryer and bathroom are vented to the outside at one of the gables; so there is no obvious sign of where warm, moist air would be coming from. However, the garage floor is completely unfinished and there is no insulation in the ceiling. The garage floor is dirt and this space opens up to the rest of the attic space and is a likely culprit for where moisture is generated on the interior of the house. One thing that really surprised me is that there even appears to be some mold growing on underside of the plywood on the covered exterior walk-round deck. It’s definitely not as prevalent as inside the house; but there nonetheless. See the photos below. I looked at some of the other homes in the area and did not see similar issues on the underside of the roof. Once I purchase the house I plan to immediately install a concrete slab in the garage which will hopefully take care of any interior moisture. I’m hoping this is the only main source of moisture. After that the thought would be to apply some type of mold disinfectant. I’ve been seeing a lot of posts recommending Foster 40-80. Finally, I’ll insulate and finish the garage ceiling. I'm also considering installing a fan at one of the gables to increase air flow through the attic space. Any observations on suspected sources of the problem and my proposed fixes would be greatly appreciated.[ATTACH]80136[/ATTACH]

Just looking for a little guidance - I'm getting quotes to have gutters installed, basically two 38' runs and two 19' runs. For seamless gutters with a leaf guard and a 20 year guarantee I was just quoted $2,948, without the leaf guard around $1,300. Not sure what I was expecting but this seems to be a lot for gutters, any opinions/comparisons out there? This equates to roughly $25/foot. One note - the warranty includes them cleaning/unblocking IF I buy the leaf guards.