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.
Gable roof no eaves.
A slight return just enough to keep water from pooling is all.
The total venting space should equal 1 150 of the floor space.
The top edge of the board rests against the roof decking and the bottom edge covers the siding or brick.
Thick and the overhang from the side wall set between 12 in.
The eave roof and gable.
Remember the roof on the return is there just to shed a small amount of water.
Do not set it to match the main roof slope of the house.
In contrast a gable or rake is the overhang of a building that occurs on the side that is topped by a gable roof.
The final step is putting the roof on the eave and addressing what happens in the gable itself.
To 18 in depending on the style of the building.
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.
This is the portion of the roof that protrudes beyond the side of a house or building.
When designing a gable end eave without a return the dimensions to look at are the width of the trim set between 6 in.
This video will.
Refer to my architectural roof types blog.
Avoid gable ends that are over 8 in.
Like rain snow sleet wind and hail.
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.
Use larger rake boards such as 1 by 4 inch and 1 by 6 inch when there isn t an eave overhang on the gable end.
Wide especially when the eave overhang is less than 12 in.
An eave is defined as the edge of the roof that overhangs the face of a wall.
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.
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.
When an eave overhangs the gable end it is known as a rake.