Low Pitch Roof Ventilation

This attic space was typically vented via static air vents.

Low pitch roof ventilation.

The sketch at left shows a method for providing effective ventilation beneath a flat or low slope building roof using 2x4 strapping to assure that there is an airspace between the insulation and the roof deck underside. The universal dormer vent is a low profile off ridge roof vent that is designed for a pitched roof of 3 12 slope or greater. A low slope roof decreases the amount of ventilation that can be achieved through stack action and the presence of large quantities of insulation often restricts the ventilation space between the insulation and the roof sheathing. The rvk1a steel roof cap kit is an the rvk1a steel roof cap kit is an easy to install vent for ventilation fans bath rec room home gym etc.

For ventilation channels to be effective you need a slope of at least 3 12 or steeper. The universal dormer vent can be used as an air intake vent or as an air exhaust vent depending on where you install it on the roof. Hip and ridge shingles starter shingles low slope products ice and water barrier synthetic underlayment intake ventilation exhaust ventilation titanium and rhinoroof. November 19 2014 9 08pm 1.

This cap features both a back draft damper and bird screen preventing outside air from entering the home and birds and small pests from entering duct work. It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience. Secondly you really have two different roof types working here low slope or flat roofs and pitched roofs. Not shown are air inlet and outlet openings to assure that this vent provision is effective.

The roof design included an interstial space of 1 5 to 2 meters between the ceiling and roof deck. About 12 x 18. There is a clear answer to your question. The universal design looks great on a shingle roof.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. Low slope roofs are difficult to ventilate but there are a few techniques that work. Basically you need lots of height above the top of your insulation layer plus a few vented doghouses cupolas. I have seen ventilated flat roofs but they are usually used in conjunction with attic spaces and you mentioned finished vaulted ceilings in your post.

So it is essentially boxed in on 3 sides.