What are the pros and cons for using ridge vents? I'm having my house re-shingled, and got estimates from two highly recommended roofers. One recommended installing a ridge vent; the other did not. The one who did not recommend a ridge vent re-roofed our other house last year and insisted on installing a ridge vent.
The house we're re-roofing is a two story "colonial" with an unfinished attic that has both soffit vents and gable vents. The house we re-roofed last year is a bungalow with the second floor (what would normally be the attic) finished.
I will discuss this with each of the roofers before I decide which one to hire, but I would appreciate any insight anyone can give me.
Also, are there any shingles that really resist algae stains, which seem to be a big problem in my area (Maryland)? Both roofers want to use Certainteed XT25AR, and neither seemed enthusiastic about the more expensive "architectual" shingles, although both were willing to install them if that's what I want.