To 18 in depending on the style of the building.
Gable roof no eaves.
A rake on the gable end of the roof can be created with the construction of additional roof framing.
Avoid gable ends that are over 8 in.
The total venting space should equal 1 150 of the floor space.
Do not set it to match the main roof slope of the house.
When designing a gable end eave without a return the dimensions to look at are the width of the trim set between 6 in.
The purpose of your home s roof is to protect the entire structure and you from weather.
A passive ventilation system should have air inlets at the base of the roof usually in the soffits and outlets in the peak or gables.
Thick and the overhang from the side wall set between 12 in.
The eave roof and gable.
Wide especially when the eave overhang is less than 12 in.
The top edge of the board rests against the roof decking and the bottom edge covers the siding or brick.
A gable roofis a type of roof design wheretwo sides slope downwardtoward the walls and the other two sides include walls that extend from the bottom of the eaves to the peak of the ridge.
It is made by extending the ridge board beyond the gable end doubling the last rafter to provide a nailing surface and installing one additional rafter a distance equal to the desired overhang.
When an eave overhangs the gable end it is known as a rake.
In fact providing exit venting at a roof ridge or at gable end vents on a building with no intake venting at the building eaves will increase the building heating costs and can also add to attic or under roof condensation moisture and mold problems.
Remember the roof on the return is there just to shed a small amount of water.
One by 2 inch rake boards often cover the exposed top edge of the siding when there also is an eave overhang on the gable end.
Now that we have that out of the way let s get to the heart of the matter venting a house with little to no eaves or soffits.
An eave is defined as the edge of the roof that overhangs the face of a wall.
In contrast a gable or rake is the overhang of a building that occurs on the side that is topped by a gable roof.
A slight return just enough to keep water from pooling is all.
Like rain snow sleet wind and hail.
Due to the steeper angle of gable roof the maximum width of the eaves is narrower than other shed styles.
The final step is putting the roof on the eave and addressing what happens in the gable itself.
This is the portion of the roof that protrudes beyond the side of a house or building.
For gabled roofs the roof rafters extending beyond the wall caps creating an angled roof overhang on the eaves.
