**Contents**show

Roof trusses should be 24” apart, on center. Trusses are allowed to be closer together, at either 12” or 16” on center, but building codes allow for 24” on center spacing without using heavier duty fasteners for truss to wall connections.

## What determines the spacing between trusses?

Trusses are usually spaced at regular intervals, typically 600 mm, 900 mm or 1,200 mm apart. The spacing depends on the mass of the roofing material and local practice. A range of truss types can be configured to attain different shapes.

## What is the distance between roof joists?

Wherever possible, joists should span the shortest distance. Common joists sizes are 200 x 50mm, 175 x 50mm, and 150 x 50mm. The joists will normally be placed at 400mm centres but no more than 600mm centres.

## How far apart should steel trusses be?

With traditional stick-frame construction, the trusses are usually spaced 2 feet apart. For many traditional stick-frame builders, trusses spaced 8 feet apart seems unnatural, but thanks to the ingenuity of modern engineering it is a very common building design.

## How far apart are roof battens?

The minimum overlap is 100mm. If additional fall protection is required on steel sheet roofs, Stratco Ceiling Battens may be fixed intermittently between Stratco Roofing Battens giving a batten spacing no greater than 600mm. Roofing battens are suitable for non-cyclonic conditions up to and including W41 (N3).

## How long can roof rafters be?

Max. Live Load 20 lbs/ft2 (956 N/m2)

Maximum Span (ft – in) | ||
---|---|---|

Nominal Size (inches) | Rafter Spacing, Center to Center, OC (inches) | Lumber Grade |

2 x 8 | 12 | 21′ – 7” |

16 | 19′ – 7” | |

24 | 17′ |

## Do trusses need center support?

Generally, you don’t need central support for domestic trusses. In industrial applications, trusses support enormous roofs made from heavy materials and thus generally require central support.

## How far apart should shed roof rafters be?

Spacing your 2×4 shed rafters at 24” on center limits the width of your roof. For light load roofs, 24” o.c. 2×4 rafters can span up to 7 ⅔’. For heavy loads, 2x4s can span up to 5 ½’. Most roof framing is 24” on center, and you can still build sheds up to 14′ with 2×4 rafters at 24” on center.

## How do I figure out how many roof trusses I need?

Divide the length of the roof by two to determine how many trusses are needed. Trusses are generally secured 24 inches on center along the top plate. For a 30-foot long roof, a total of 15 trusses are needed.

## How far apart should rafters be on a metal roof?

Both 16 inches and 24 inches are common measurements for rafter spacing.

## Can you put trusses 4 ft on center?

Depending on your builder or building designer, the usual range is anywhere from 2′ on center to 10′ on center with the majority of builder’s either using 4′ or 8′ on center or a mix of the two. … A lot depends on the engineering of your truss and your local wind/snow loads that your building will have to withstand.

## How do you calculate batten spacing?

Add 1 to your number of spaces to get the number of battens on the wall. Now multiply your batten width by the number of battens. Subtract that number from your total wall length. Divide that number by the number of spaces you calculated earlier, and THAT number will be your exact spacing between each batten.

## How do you calculate roof battens?

Measure the distance from the top of the lowest batten to the top of the highest batten. Divide the distance by the maximum gauge of the tiles being used, and round the result up to the next largest whole number. The result is the number of courses of tile on the roof, rounded to a whole number.

## What is the difference between purlins and battens?

But a “purlin” is applied directly onto the roof rafters, running perpendicular between them, while a “batten” is nailed to roof sheathing or applied over an existing roof for installation of a new roof.