Disclaimer: I am not a carpenter. I'm just trying to get rid of an ice damming issue.
My house was built in the 40's as roughly an 18'x18' structure, 2 story, no attic. Roof is like a 12 in 12 pitch? [looks 45 degrees to me.] Shortly after that, a 12'x18' single story (with a short crawl space above) addition was added. The roof for this part is more shallow, like 30 degrees. Anyhow, I have issues with ice damming on this "new" roof, due to ventilation: this roof has a single 4"x6" vent.
Now, at the end of the original rafters there is fascia, untouched after all these years. The previous house owner redid most of the interior, including insulation and sheetrock; he did put the pink foam tray under the roofing and a ridge vent. On the original portion of the house, that is. The addition has the old crawlspace, untouched basically. The crawlspace is insulated from the rest of the house; it cannot vent into the venting on the steeper roof; as a result, this roof isn't vented either (no air intake).
My question is: can I drill holes into this fascia, so as to allow venting to occur? This isn't some form of fire blocking? I have to go get a photo of the crawlspace, but below are exterior photos.
Back of house, faces east:
Side of house, with leak, faces south:
Front of house, faces west:
Last side of house: