Even easier to install and with all of the daylighting benefits! Our manual venting skylights are the preferred choice for when ventilation will be occasional need. All Deck Mounted Skylights require at least a 3/12 roof pitch. They are best suited for use with thin roofing materials up to 3/4" thick. Like all of our skylights these are not intended for vertical installations. Bug screens are included with all of our ventilating skylights.