If you plan to heat the garage and insulation is to be placed between the rafters the space must be wide enough to provide for the thickness of the insulation.
Garage roof trusses spacing.
Most are spaced between 18 26 inches apart.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation.
If the roof slope is steeper than 9 inches in 12 inches of run it doesn t take much width to end up with a nice room 12 feet wide with an 8 foot ceiling.
Putting the trusses into place.
Once you ve calculated the number of trusses you will need you should purchase the lumber.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
Look at this photo of the space created by attic trusses at my home.
In terms of how this generally operates it is worth noting that that too is with the same two by four material and the trusses are also going to be around the same spacing that is twenty four inches off centre.
Sheathing should be a minimum of 19 32 inch thick.
Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run.
8d ring shank nails should be used instead.
Check your local building code for the specific interval as it can vary by area.
Attic trusses have a rectangular shape inside each truss.
Rafters are placed at 12 16 or 24 inch intervals.
Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet.
So if your ceiling is unfinished you have some excess carrying capacity up there.
I have this above my own garage.
So the space between rafters can be greater without reducing the maximum span.
That means you could lay a 2 x 4 ft.
The same concept holds true for roof trusses.
Never attach roof sheathing with staples.
Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs.
In a garage the garage roof truss spacing is usually made in accordance with the local building laws after all a garage is an occupied space as much as a house is.
The rise will be the elevation change over the 12 inches.
The trusses should be a little longer than the exact width to allow for overhang and you will need sufficient trusses to mount across the length.
If interior moisture were improperly managed for example if a clothes dryer were vented into a finished garage area instead of to the outside a 16 inch on center truss spacing would be more forgiving of the bad practice.
While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.
For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically.
Scrap of plywood over the chords and set about 40 lbs.
The run or the base number is 12 inches.
